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Transmission of Xanthomonas campestris pv. campestris in seed production crops of cauliflower
Kastelein, P. ; Krijger, M.C. ; Zouwen, P.S. van der; Steen, J.J.M. van der; Stevens, L.H. ; Wolf, J.M. van der; Fernandes Vieira, J. ; Amaral Villela, F. - \ 2014
In: Proceedings of the IInd International Symposium on Organic Greenhouse Horticulture. - Leuven, Belgium : ISHS - ISBN 9789462610309 - p. 197 - 2014.
n 2011, two polytunnel greenhouse experiments were conducted on seed production farms, one under conventional conditions in the South-West (Rilland) and the other under organic conditions in the East (Voorst) of the Netherlands, to study transmission routes of Xanthomonas campestris pv. campestris (Xcc), that can result in seed infections of cauliflower plants (Brassica oleracea var. botrytis). Each experiment consisted of three plots. Before head formation, plants in the two outside plots were spray-inoculated with either Xcc strain IPO 3076 or IPO 3078, and plants in the central plot were sprayed with water. A colony of honeybees (Apis mellifera) was placed in each tunnel to provide pollination. At Rilland, incidences of black rot were low, and seed infections were not detected in a plating assay, although peduncles were infected in a high percentage of the plants. At Voorst, black rot symptoms developed in almost all Xcc-inoculated plants, resulting in plant losses. The incidence of plants with infected seeds in the plot inoculated with Xcc IPO 3076 was higher than in the two other plots. Identification of Xcc isolates by BOX-PCR revealed that Xcc IPO 3076 was transmitted to the other plots of the experiment. Xcc IPO 3078, however, was only recovered from plants inoculated with this strain. The routes of seed infection for Xcc and then transmission of the pathogen are discussed
Development of FRET biosensors for mammalian and plant systems
Hamers, D.S. ; Voorst Vader, L. van; Borst, J.W. ; Goedhart, J. - \ 2014
Protoplasma 251 (2014)2. - ISSN 0033-183X - p. 333 - 347.
yellow fluorescent proteins - photoactivated localization microscopy - resonance energy-transfer - living cells - mass-spectrometry - dynamic-range - time - ca2+ - resolution - indicators
Genetically encoded biosensors are increasingly used in visualising signalling processes in different organisms. Sensors based on green fluorescent protein technology are providing a great opportunity for using Förster resonance energy transfer (FRET) as a tool that allows for monitoring dynamic processes in living cells. The development of these FRET biosensors requires careful selection of fluorophores, substrates and recognition domains. In this review, we will discuss recent developments, strategies to create and optimise FRET biosensors and applications of FRET-based biosensors for use in the two major eukaryotic kingdoms and elaborate on different methods for FRET detection.
Het Landgoedvenster – Een nieuw instrument voor de maatschappelijke ontwikkeling van landgoederen
Alebeek, F.A.N. van; Vijn, M.P. ; Schoutsen, M.A. - \ 2011
Lelystad : PPO AGV - 34
landgoederen - landschap - identiteit - landschapsbeleving - landgebruik - opinies - inventarisaties - estates - landscape - identity - landscape experience - land use - opinions - inventories
Landgoederen spelen vanouds een vooraanstaande rol in het integraal en multifunctioneel inrichten en beheren van de groene ruimte. Zij moeten zich telkens opnieuw vernieuwen om vitaal te blijven. Dat kan alleen als zij zich bewust verhouden tot de Nederlandse verstedelijkte samenleving. Zij moeten ook zorgen dat zij gezien worden om die plek te behouden. Zij zullen zichtbaar moeten maken wat hun rol en waarden zijn voor de maatschappelijke behoeften van hun omgeving. In het project ‘Landgoed in 3D!’ zoeken vooruitstrevende landgoedeigenaren naar een nieuwe visie op de rol van landgoederen. Deze landgoederen zijn: - Landgoed Beekzicht te Voorst; - Landgoed Vilsteren; - Landgoed Tongeren te Maarn; Landgoed Grootstal te Nijmegen
|Barnevelder bedenkt 'onkruidrobot"
Bakker, T. ; Voorst, M. van - \ 2009
Barneveldse Krant (2009). - 1 p.
Baron op klompen : mr. B.W.A.E. baron Sloet tot Oldhuis (1807-1884) aan de hefboom tot welvaart
Coster, W. - \ 2008
Wageningen University. Promotor(en): Pim Kooij. - [S.l.] : S.n. - ISBN 9789085049500 - 416
biografieën - politiek - economie - onderwijs - kennis - communicatie - handel - landbouw - plattelandseconomie - kolonialisme - nederland - geschiedenis - plattelandsontwikkeling - oost-nederland - biographies - politics - economics - education - knowledge - communication - trade - agriculture - rural economy - colonialism - netherlands - history - rural development - east netherlands
During the nineteenth century many changes took place in The Netherlands, which in various ways have determined the structures we are living in today. Not only did the unification of the ‘archipelago of regions and communities’ from the period of The Republic make progress in the field of politics, (social-)economy and demography, but also in the field of language and culture, (town- and country-)planning and the structure of the landscape. Simultaneously the nation state of The Netherlands -which developed after a strongly directive French-Batavian intermezzo- remained a colourful mosaic of fixed or changing structures, materials and nuances. The origin, direction and pace of the various, sometimes co-existing phases in this process were, to a large extent, determined by people who stepped forward with their ideas, ideals and initiatives. These people had to deal with counter forces: from other persons, both individually and collectively, or from the physical environment which confronted them with sometimes unexpected difficulties and possibilities. It was – although opinions differ in this respect – above all a process of the work of man.
One of those who played an important role in the changing process of the nineteenth century was the lawyer Bartholomeus Willem Anne Elisa baron Sloet tot Oldhuis (1807-1884). ‘Sloet’, as he was usually called, was born in the village of Voorst in Gelderland, but most of his life he lived in and worked for the province of Overijssel. He held many offices, including those of mayor, judge, council member, provincial councillor and school inspector. In 1841 he was the originator of the ‘Overijsselsche Vereeniging tot Ontwikkeling van Provinciale Welvaart (‘Overijssel Society for the development of Provincial Prosperity’), in short ‘Welvaart’, and also of the subsequent ‘Landhuishoudkundige Congressen’ (‘Agronomic Congresses’) in 1846. Between 1840 and 1860 he was one of the leading men in the national political arena. In 1840 and again in 1848 he was a member of the Double Chamber for the amendment of the Constitution and he resided in the Second Chamber (Commons) between 1848 and 1860. Sloet was known to be a critical and headstrong liberal, who stood up for the interests of the countryside, especially those of the provinces of Overijssel and Gelderland, without becoming a narrow minded regionalist. He fought with and against Thorbecke, supported Van Hoëvell in debates on the policy regarding the Dutch East Indies and was one of the most ferocious opponents of Groen van Prinsterer. For decades the ‘Tijdschrift voor staathuishoudkunde en statistiek’ (Journal for political economy and statistics), which was founded by him in 1841, was considered to be the essential liberal mouthpiece. Both in word and in action Sloet was a pioneer who devoted himself to the emancipation and development of agriculture and the countryside, the construction of roads and waterways, and to the spreading of knowledge and skills. His views on the relationship with the colonies in the East and the West were sensational. Meanwhile he published widely both as a poet and a folklorist. Many of his initiatives succeeded, others failed, but his goal remained to stand at ‘the lever to prosperity’.
His strongly felt presence, his wilful character, his versatility and his vigour make Sloet a splendid guide through his time. Not only because of what he achieved but also because of his disappointments and failures and the opposition he was confronted with. The fact that he came from the eastern part of the country, together with his regional orientation and the availability of relevant sources makes it possible to select specific regional fragments against the scenery of the nineteenth century.
The present research concerning Sloet tot Oldhuis fits perfectly into the biographical tradition which over the past decade has also found its way into the field of agrarian history. By choosing themes from the life and work of a renowned figure in his time Baron op klompen (‘Baron in clogs’) seeks to show the important role Sloet has played during a large part of the nineteenth century in the political, economical and rural arena, more specifically in agriculture, planning and (political) culture; those aspects which were decisive in the development of the nation state of the Netherlands. The emphasis will be on the period between, roughly, 1840 and 1870.
The title ‘Baron op klompen’ also refers to the fact that Sloet -being a nobleman who did not out of ‘noblesse oblige’ feel obliged to defend the rights of his class- became an advocate for the backward rural regions and the peasantry. A new element in the present research is the fact that the results of the explorations of the ‘curriculum’ of chapter 2 are elaborated in subsequent chapters and in the interaction between them. That is why this new type of biography may be called a ‘concentric biography’.
The essence of this research is to show how a representative from the eastern part of the Netherlands, who may be assumed to have had much influence on the development of the modern nation, manifested himself. Here the term ‘modernization’ is used as ‘a complex of simultaneously occurring developments which strengthen each other into a certain direction’. These developments are elaborated in four themes representing important aspects in Sloet’s social life: knowledge and skill, infrastructure, the countryside with its agriculture, and the colonies. Again and again the question is raised how his personality and intellectual background affected his actions. Each of these chapters raises a specific research question. A recurring question is what contribution Sloet has made to the development of the political culture by his public actions in the local, regional and national arenas.
In a way this research is a counterpart to the NWO-research of modernization and democratization in the Dutch countryside which is being conducted by the Rural History Group of Wageningen University, under the guidance of dr A.J. Schuurman. It therefore also poses the question which government bodies, organizations, newspapers and periodicals were responsible for stimulating the process of modernization and the development of the countryside. In this case the question is aimed specifically at the role Sloet played in this process. In other words – see the conclusion of chapter 1 - whether figures like him, who did not belong to the ‘titans’ in national politics, could ‘move the lever of prosperity’.
After the introductory chapter 1, ‘Aan de hefboom tot welvaart’ (‘At the lever of prosperity’), chapter 2, ‘Achtergronden’ (‘Backgrounds’) describes Sloet’s personal life. It deals with his curriculum vitae cum annexis, characterises him as a person and shows which tools he was given and which he gained during his life. It inquires after his ambitions and after his economic, social and cultural capital. In line with the concentric method, specific answers to these questions will be given in each of the subsequent chapters. This chapter pays special attention to Sloet as mayor of Hengelo (Overijssel) between 1832 and 1838, because it would prove to be the breeding ground for Sloet’s ambitions and activities afterwards in national politics. What he tried to achieve in Hengelo at a local level he would later attempt at a national level. Finally this chapter pays explicit attention to his literary work, which in the other chapters is mainly used to illustrate.
Chapter 3, ‘Twee maal een onzichtbare hand’ (‘Twice an invisible hand’), elaborates on Sloet’s intellectual baggage. His thoughts appear to have been guided by two invisible hands: that of religion and that of economy, while Classic Antiquity also took up a prominent part of this baggage.
In his religious life Sloet was guided by ‘physico-theology’, a school of thought which originated during the age of Enlightenment and was based on the idea that the forces of nature refer to a Creator. Other physico-theological writers, such as J.F. Martinet (1729-1795) wanted to convince their readers of the existence of God and his lasting care for his Creation on the strength of the available knowledge of natural phenomena. They wanted to point out that Nature is organized in such a systematic and functional way that a Nature without God simply cannot exist. What is more they summoned everybody to get to know and admire the magnitude of the Creator by means of the investigation of Nature. This way of thinking is based on both rational proof of God’s existence and the visible manifestation of God’s power, wisdom and goodness in the cosmic order of things. In accordance with the empirical spirit of the times this last aspect was emphasised most in the eighteenth century. Although a man of the nineteenth century, empiricism fitted Sloet like a glove.
According to Sloet morality was closely connected with religion in defining morals, norms, values and (therefore) citizenship. From morality to political economy was another small step as far as Sloet and many of his contemporaries were concerned. Within this context statistics and rural economy were also important and Sloet was certainly intensively engaged in these matters. The pillars of his world view and thoughts on people’s happiness -in the sense of material and non-material prosperity- were therefore a mixture of classic, Christian and profane materials. Chapter 3 explores the composition of this mixture.
As Hans Boschloo quite rightly states in his work De productiemaatschappij, in 1848 Sloet was ‘just like almost every other ‘laisser faire’ economist probably a Thorbeckian’. However, over the years he found himself more and more estranged from the liberal mainstream. In his eyes liberalism brought too much state interference, which was harmful to regional autonomy and resulted in unnecessary bureaucracy, his two largest frights. Because where could personal interests be served better than in one’s own immediate surroundings? And why should civil servants in The Hague interfere with the life of a farmer in Overijssel? Sloet considered freedom and centralisation to be opposites. This does not mean, that he was against any form of state interference, except where it concerned the care for the poor or the non-productive citizens. In that case he adhered to the principle: ‘he who does not work shall not eat’, although he would not say so outright. For Sloet – who was after all a lawyer – the form of government was less important than the general Christian state family in which everybody knew his place and lived by the same unwritten rules and principles, while fulfilling a task in order to provide for his or her livelihood.
The next four chapters show how Sloet operated, being guided by this way of thinking.
Chapter 4, ‘ ‘Kennis is de ware tooverij’ ’ (‘ ‘Knowledge is the true magic’ ’), pursues the value Sloet attached to organizations which furthered mutual contacts, research, information and education, public governance and well functioning media as necessary links to knowledge and information. Or, to put it in modern terms: networks, education and research, public relations and communication. His contribution to the political culture is also dealt with explicitly, while in the following chapters this contribution is further illustrated with practical examples. The question is what his approach was, who he involved and what the results were of his efforts, even though the answer to this last question will be saved for chapters 5, 6 and 7.
According to folklorist Tjaard de Haan, the fact that Sloet, in his ‘Ode aan de IJssel’ (‘Ode to the IJssel’) rhymes ‘stichting’ (edification/foundation) with ‘volksverlichting (‘enlightenment of the masses’), is typical for his active attitude toward life. He was one of the gentlemen who had woken, or wanted to wake, the countryside. His great strength was his zest for work, which was fed by his belief in the possibility of shaping or at least improving society and in the power of science. ‘Knowledge is the true magic’ was his motto as written down in 1865. At the same time it meant a confirmation of his belief in the divine nature which would allow itself to be uncovered by science. Nevertheless these discoveries needed to be translated to all layers of society if they were to benefit general prosperity.
Chapter 5, ‘ ‘Wegen te water en te land’ ’ (‘ ‘Roads in the water and on land’ ’), deals with the development of infrastructure, both locally and internationally, i.e. roads, waterways and railroads in the Netherlands and across the borders. How Sloet dealt with his ideas in these areas is examined here. What were his goals? Who were his allies and who his opponents in the borderland between public and private interests? What effects did his efforts achieve? Especially his activities in Overijssel, notably his desire to change its capital into a genuine seaport are emphasised here. Special attention is paid to his conspicuous efforts to make improvements on ‘the waterway between Zwolle and the sea’, the route via the ‘Zwarte Water’ and the ‘Zwolse Diep’. For this case caused political and personal polarization and shows a great deal of Sloet’s character and his political style. Besides, the perils around this ever so important part of Overijssel’s infrastructure led to a novelty in Dutch politics: the first full Parliamentary Inquiry in 1856.
At a time when Sloet exerted all his influence for the realization of the waterway from Zwolle to the sea and for the first railroads to and in Overijssel, shortly before the middle of the nineteenth century, he also pointed out the importance of ‘the footpaths of the nation’: the indispensable and undeniable winding paths in the countryside which were literally threatened to be buried by modern times. On the one hand he valued them because of their arcadian character, on the other also and the more so because of their economic value. The moral of the story being that modernization was useful and necessary but one should take care not to reject the good with the bad because old things also had their rights and served their purpose and should not be so easily dismissed. Sloet compared infrastructure to a blood circulation system in which each little vein served its purpose both for the entire body and for an individual body part. Without roads, however small they might be, there could be no trade and without trade there was no progress. This was the lesson he had learnt from Martinet and Adam Smith.
One victory was booked in 1860: just before he left the Second Chamber a Railway Act with national validity was passed, which also served the provinces, even though practice would show once again the West taking control over the initiative and the National Railways. Private initiative resulted in the completion of the ‘Zuiderzeelijn’ in 1864, a project in which Sloet had put a lot of effort, as far back as in the 1840s. At least his ideas and initiatives had contributed to the development of a coherent network of transport and communication lines, one of the necessary requirements for environmental integration.
Chapter 6, ‘Landbouw, landhuishoudkunde en landleven’ (‘Agriculture, rural economy and rural life’), deals with the role the agricultural sector played within and for Dutch national economy and how aspects such as knowledge, know-how and communication influenced this role according to Sloet. The chapter starts with a short description of agriculture in Overijssel in the nineteenth century.
The first question in this context is how Sloet valued the situation of agriculture in The Netherlands and its developments, especially in the province of Overijssel. Secondly, which arguments does he pose for the different views there are on this issue? A third question is what Sloet has contributed to the development of agriculture, both nationally and in Overijssel? Finally, can he be considered a representative of a certain group or did he occupy a special position within Dutch agriculture?
Sloet saw the agricultural sector as full of potential, some of which was also realised. Although this filled him with satisfaction and delight, it was no reason to sit back complacently, because new situations and developments also created new opportunities which needed to be utilized. The overall goal remained to explore and exploit the treasures of nature which became available through agriculture and, of course, otherwise. Farmers had a specific and important role in this process. For the eastern part of the Netherlands with its specific agrarian characteristics Sloet thought the best option was to develop the small family business. In a way and avant la lettre this manner of thinking fits within the later theory of Ester Boserup who speaks of ‘the relation between population growth in a certain ecological system and the changes in agriculture, more specifically the intensification of farming, which are a result of this growth’. Sloet considered ecology and economy to go hand in hand and according to him developments in the agricultural production process were determined by natural circumstances. But it was up to man to recognize these circumstances and to make use of them and improve them. Only then could the population grow. The necessary employment could amply be found in the countryside. Sloet considered investing on a small scale, such as providing seeds and simple sausage recipes better than introducing large farming equipment which would mostly benefit the big farmers. Modernization of agriculture should therefore aim at the small peasant family business. Rather than for mechanization Sloet opted for the use of human labour as a means to increase productivity.
Where the second question - of the different views on production development in agriculture- is concerned, Sloet simply does not provide us with the necessary statistics, despite his efforts. He did recognize, however, the rapid growth in population, the resulting pressure on the soil, the necessary intensification in agriculture and the just as necessary improvements of the infrastructure with, of course, the opportunities which these developments created. Van Zanden’s thesis, that up to about 1870 the influence of ‘institutions’, organizations and institutes on actual farming had been small, needs to be questioned. The existing agricultural societies before 1870 certainly made their contributions, especially Sloet’s Agronomic Congresses and, where Overijssel is concerned, ‘Welvaart’. Sloet was living proof that ‘people do make a difference’.
This also forms the beginning of the answer to the third research question, namely which contribution Sloet has made to Dutch agriculture, and especially that of Overijssel. By using his countless connections in politics, the Agronomic Congresses, among men of science and farmers, with his knowledge of national and international literature on the subject and last but not least on the basis of his own observation, he was the seemingly tireless stimulator behind small but indispensable little pulls at the lever of prosperity. To his great dismay and despite his efforts of many years he did not succeed in causing the tithes, a tax which he considered to be harmful to the development of agriculture, to be abolished.
The answer to the question as to what extent Sloet has taken up a position of his own in Dutch agriculture is closely connected with his descent and the region he grew up in. His childhood in Gelderland gave him direction and shaped him – as it had done his father and mother before him – into a tool of progress in the countryside and it made him an exponent of rural life. Not because he desired to play the role of ‘gentleman’, but for the love of his surroundings and the people with whom he felt connected. With his ‘physico-theological’ way of thinking as a liberal politician, economist, governor, man of letters and as a folklorist he is indissolubly connected with the agriculture and the countryside of The Netherlands and especially the countryside of the eastern part of The Netherlands or the ‘Saxon’ countryside, as he called it.
All together this creates a colourful and original person. In a sense Sloet was born in the wrong environment. He was different; he was a baron in clogs. However, if he had been a farmer in clogs he would not have been able to achieve the things he did by being the man he was.
Chapter 7, ‘Provincies overzee’ (‘Provinces overseas’), describes the way Sloet, together with baron Van Hoëvell, the militant ex-clergyman in the East Indies, initiated the discussion on colonial policy and launched ideas to emancipate the colonies in the East and the West and to make them more profitable. His actions are mainly highlighted by his role in the Second Chamber. Especially his interpellations on several issues and on a few particular items: a colonization project in Surinam, his proposal to sell land on Java, the ‘Cultuurstelsel’ (cultivation system) and the Government Regulation for the Dutch East Indies which came into force in 1854. Moreover his attitude towards the Dutch Trading Company (Nederlandsche Handel-Maatschappij, in short ‘NHM’) and the issue of slavery, which he strongly condemned, are discussed here. The results of his actions should be regarded in the light of the question what his contribution has been towards the development of the political culture after 1848.
Where the issue of the ‘colonies’ was concerned, Sloet brought about a change of culture. He endured storms without being able to harvest but he opened up possibilities for others, especially with regard to the East. Several interpretations with regard to the abolishment of the ‘Cultuurstelsel’ were congruent with his ideas on the topic. Firstly, as a classic liberal, he fought against forced labour and the monopoly of the colonial government, and especially the NHM. The amendments and changes which were attributed to criticism of left-wing liberals were mostly due to Sloet’s work. Already in 1849 Sloet started discussions in the Second Chamber on various matters, thereby uncovering abuses which were unheard of at that time. What is more, in doing so he specifically drew attention to the interests of the native people.
Secondly, he did not mind reforms made by civil servants in, as Fasseur states, removing or softening the aggravating burdens of the ‘Cultuurstelsel’ (Cultivation system). On the contrary, by making these changes (which could only be realised in a government system based on transparency) the ‘Cultuurstelsel’ could – according to Sloet - actually coexist with a system based on free labour and Western entrepreneurship. Finally, the interpretation that in the Dutch Indies there was a growing group of entrepreneurs with sufficient knowledge and capital to change the ‘Cultuurstelsel’ into a system based on free labour and Western enterprise, was very much in line with Sloet’s ideas. However, he also wanted to make it possible for new initiatives from the Netherlands and from the Western world in general to exploit the potential riches of the Dutch East Indies (including the Outer Provinces). If he thought fit Sloet looked not only across the regional, but also across the national borders. For him the general interest took precedence over the private interest.
In his perception of the colonies Sloet agreed with the French economist and colonial propagandist Paul Leroy-Beaulieu (1843-1916) who spoke of ‘colonisation moderne’ as exploitation based on free production and private capital. ‘Such colonization does not recognize a difference between colonials and the colonized, exploiters and the exploited, but is beneficial to both’. Proper colonial policy should not impoverish or deprive the indigenous people but should enrich them, and with that the colonial government. This was exactly the doctrine he had expounded in his ‘Grondtrekken van de Staathuishoudkunde’ (Characteristic Features of Political Economy) and this was congruent with the principles he attributed to christianity. According to him the colonies were also guided by the two invisible hands of political economy and of Christendom.
Most important however, was the fact that Sloet by his heavy criticism provided politics and political culture with a new form and substance in a time when colonial benefits had culminated.
The main research question in this study was posed in chapter 1, questioning whether individuals who were not considered to be among the ‘titans’ of nineteenth century politics could bring about any movement in the lever of prosperity. Focussing on Sloet’s person this was mostly about the development of the countryside in the eastern part of the Netherlands, Overijssel specifically, and about the Dutch colonies. There was also the question how much he has contributed to the political culture of his time.
The first conclusion in the final chapter 8, ‘Eén gezin, vastgesnoerd door broedermin’ (‘One family, tied together by brotherly love’), is that Sloet’s life and aspiration were permanently aimed at his ultimate goal: progress. This did not necessarily mean choosing new methods and techniques or enormous expansions. His perception of modernization was that of the definition as mentioned in chapter 1: ‘a complex of simultaneously occurring developments which strengthen each other into a certain direction’. The object of this direction was ahead of him, but where necessary and if there were things to be learned, he was not afraid of looking back either. In the same way his perspectives would change in his geographical orientation. The basic elements for the desired development he found first and foremost in his immediate surroundings. Most examples would come from his own sphere of work in the eastern part of the Netherlands, but they only served to provide substance for a model for Overijssel or Gelderland, The Netherlands, the Dutch colonies or for the world. On the other hand he was also in the habit of using the knowledge he acquired from his connections or through literature to the benefit of his immediate environment. Nevertheless he would always keep the natural situation in mind and would take care not to damage any other regions wherever these might be. As Martinet’s Katechismus der Natur (‘Nature’s Catechism’) had taught the young Sloet: that was not in accordance with God’s intentions.
In 1862, two years after he had been obliged to leave the Second Chamber -thereby practically ending his role in national politics- Sloet was both satisfied and dissatisfied. In his case this was inevitable. Of course, much had been achieved. He had had his share in the new and constantly changing world. He had been responsible for waking up the countryside of Overijssel not only by introducing new farming methods and new strains and crops but also by providing knowledge and insights and means to express them. He had contributed to the construction of roads, railways and canals. He had stirred the political debates with his critical, though sometimes rather thoughtless contributions. As a Multatuli avant la lettre he had spoken for the people of the Dutch East Indies. In his poetry he had focussed on the beauty and intrinsic value of nature. He had explored limits and most of all he had shown how far human effort could reach. Therefore he was all about progress, but he would not think twice about stopping a vehicle that was out of control either.
Sloet supported the late eighteenth century ideal of freedom, which revolved around the freedom of the citizen and which limited the powers of the state to the passing and upholding of laws necessary for a society to function. He even went one step further and would have preferred to reduce those laws as well, convinced as he was that they were not necessary, for in his eyes mankind was ‘one family, tied together by brotherly love’. In the end we can only come to the conclusion that Sloet may not have been a ‘titan’, but he certainly has set ‘the lever to prosperity’ going. He has explored and shifted boundaries and he has served as a model for the creed: ‘People do make a difference’.
Tibiale dyschondroplasie bij kalkoenen: Vijfde proef: geen effect langzame begingroei.
Veldkamp, T. ; Voorst, S. van - \ 2007
De Pluimveehouderij 33 (2007)48. - ISSN 0166-8250 - p. 16 - 17.
pluimvee - kalkoenen - dierziekten - bewegingsstoornissen - dyschondroplasie - voedering - voedingsrantsoenen - onderzoeksprojecten - poultry - turkeys - animal diseases - movement disorders - dyschondroplasia - feeding - feed rations - research projects
Vier onderzoeksinstituten in Schotland, Duitsland, Zwitserland en Nederland doen in EU-verband onderzoek naar bewegingsstoornissen bij kalkoenen. Nederland richt zich in zes proeven op de effecten van fokkerij en management op de ontwikkeling van tibiale dyschondroplasie (TD). In de vijfde proef is gekeken naar het effect van voersturing (sturing van het lichaamsgewicht). In dit artikel de bevindingen
Do Low-Density Diets Improve Broiler Breeder Welfare During Rearing and Laying.
Jong, I.C. de; Enting, H. ; Voorst, A. van; Blokhuis, H.J. - \ 2005
Poultry Science 84 (2005)2. - ISSN 0032-5791 - p. 194 - 203.
quantitative food restriction - high-fiber diets - feed restriction - pregnant sows - oral behavior - fed fowls - females - corticosterone - stress - stereotypies
Low-density diets may improve welfare of restricted fed broiler breeders by increasing feed intake time with less frustration of feed intake behavior as a result. Moreover, low-density diets may promote satiety through a more filled gastrointestinal tract, and thus feelings of hunger may be reduced. Broiler breeders were fed 4 different diets during the rearing and laying periods. Behavioral and physiological parameters were measured at different ages as indicators of hunger and frustration of the feeding motivation. A diet of 8.4 MJ/kg as compared with a standard diet of 10.9 MJ/kg extended feeding time and reduced stereotypic object pecking at 6 and 10 wk of age. Furthermore, compensatory feed intake at 12 wk of age was reduced. During lay, differences in behavior were observed between the treatments that could be attributed to differences in feeding time. However, birds fed the diet with the lowest energy content (i.e., 9.2 MJ/kg) had higher heterophil to lymphocyte ratios (H/L) at 40 wk of age compared with the other treatments, indicating that they experienced more stress during the laying period than the other treatments. This result could have been due to the very long feeding time of this treatment group during lay, which may be stressful. In conclusion, a low-density diet of 8.4 MJ/kg may reduce hunger and frustration in the first half of the rearing period. However, for substantial improvement of broiler breeder welfare during rearing, more extreme diet modifications are required
Tibiale dyschondroplasie bij kalkoenen: Hy.D in voer vermindert TD niet aantoonbaar
Veldkamp, T. ; Voorst, S. van - \ 2004
De Pluimveehouderij 34 (2004)21. - ISSN 0166-8250 - p. 18 - 19.
kalkoenen - pluimveeziekten - bewegingsstoornissen - dyschondroplasie - botziekten - voedersupplementen - vitaminetoevoegingen - fosfor - calcium - kalkoenvoeding - turkeys - poultry diseases - movement disorders - dyschondroplasia - bone diseases - feed supplements - vitamin supplements - phosphorus - turkey feeding
In zes experimenten onderzocht het Praktijkonderzoek het effect van verschillendede genetische, omgevings- en voedingsfactoren op het vóórkomen van tibiale dyschondroplasie (TD) en de ernst ervan bij vleeskalkoenen. In dit artikel de resultaten van de zesde en laatste proef. Hieruit bleek dat toevoeging van Hy.D (een vitamin D3-bron) bij laag of hoog calcium- en opneembaar fosfor-gehalte in de voeders (Ca en oP) geen effect had op het aantal qevallen van TD of de ernst ervan
Vierde proef : lichtschema en lichtsterkte hebben geen effect. Tibiale dyschondroplasie bij kalkoenen
Veldkamp, T. ; Voorst, S. van - \ 2003
De Pluimveehouderij 33 (2003)29/30. - ISSN 0166-8250 - p. 18 - 19.
kalkoenen - pluimvee - diergeneeskunde - pluimveehouderij - dyschondroplasie - botziekten - leg weakness - bewegingsstoornissen - onderzoeksinstituten - organisatie van onderzoek - internationale samenwerking - proefstations - turkeys - poultry - veterinary science - poultry farming - dyschondroplasia - bone diseases - movement disorders - research institutes - organization of research - international cooperation - experimental stations
Onderzoek in EU-verband naar bewegingsstoornissen bij kalkoenen, tibiale dyschodroplasie staat hierbij centraal. Het effect op TD van kalkoenenlijn, temperauur, sekse, leeftijd, lichtschema en lichtsterkte, voersturing en vitamine D werden door het Praktijkonderzoek Veehouderij in zes projecten onderzocht. De bevindingen van de vierde proef
Parameters for quantification of hunger in broiler breeders.
Jong, I.C. de; Voorst, A.S. van; Blokhuis, H.J. - \ 2003
Physiology and Behavior 78 (2003)4-5. - ISSN 0031-9384 - p. 773 - 783.
quantitative food restriction - feed restriction - domestic chicks - growth-rate - welfare - females - glucagon - glucose - insulin - stress
The commercial restricted feeding programme of broiler breeders has a major negative effect on welfare, as the birds are continuously hungry. Objective parameters of hunger are needed to evaluate new management or feeding systems that may alleviate hunger and thus improve broiler breeder welfare. The aim of this experiment was to develop such parameters. Female broiler breeders (Hybro G), n = 10 per treatment, were subjected to different levels of feed restriction and we assumed that we thus induced different levels of hunger. Treatment groups were fed ad libitum and at 90%, 70%, 50%, 35% and 25% of ad libitum. In addition, female broiler breeders that were less intensively selected on growth and food conversion (JA57, n = 10 per treatment) were fed ad libitum and at 70% of ad libitum. At 6-7 weeks of age, home pen behaviour, behaviour in the open field and baseline plasma corticosterone, glucose and nonesterified fatty acid (NEFA) concentrations were determined. Thereafter, birds were subjected to the feed intake motivation (FIM) test that measures compensatory feed intake. Linear relationships between the level of restriction and the compensatory feed intake on the first days of the FIM test and the glucose/NEFA ratio were found which indicate that these parameters can be used to quantify the level of hunger. Curvilinear relationships between sitting and standing in the home pen, walking in the open field and level of restriction were found. A third-grade hyperbolic relationship between the level of restriction and the baseline plasma corticosterone concentration was found. Thus, these parameters do not seem to represent a straightforward relation with the level of hunger. Intensive selection on growth and food conversion seems to have affected the behaviour but not the physiological responses to feed restriction, because the JA57 birds responded behaviourally, but not physiologically, different to feed restriction as compared with the Hybro birds. (C) 2003 Elsevier Science Inc. All rights reserved.
Huisvesting en verzorging van vleeskuikenouderdieren zonder ingrepen
Haar, J.W. van der; Voorst, A. van; Middelkoop, J.H. van; Lourens, A. - \ 2002
Lelystad : Praktijkonderzoek Veehouderij (PraktijkRapport. Pluimvee 3) - 23
vleeskuikens - pluimveehokken - dierenwelzijn - milieu - verrijking - vleeskuikenouderdieren - broilers - poultry housing - animal welfare - environment - enrichment - broiler breeders
Door het Ingrepenbesluit zijn ingrepen bij vleeskuikenouderdieren op termijn verboden. Praktijkonderzoek Veehouderij (voorheen Praktijkonderzoek Pluimveehouderij) onderzoekt daarom sinds 1998 het effect van het achterwege laten van ingrepen bij vleeskuikenouderdieren in relatie tot huisvesting en verzorging. Dit rapport beschrijft de resultaten van de laatste (derde) proef. Al eerder verschenen de bevindingen over de effecten van weglaten van ingrepen bij vleeskuikenouderdieren op gedrag, veer- en huidbeschadigingen, uitval en technische resultaten.
Effects of restricted feeding on physiological stress parameters in growing broiler breeders
Jong, I.C. de; Voorst, S. van; Ehlhardt, D.A. ; Blokhuis, H.J. - \ 2002
British Poultry Science 43 (2002). - ISSN 0007-1668 - p. 157 - 168.
In previous studies, a lack of agreement in measurements of plasma corticosterone concentrations and heterophil:lymphocyte (H/L) ratio as physiological indices of stress, caused by hunger and frustration in restricted-fed broiler breeders, was observed. It could be suggested that the differences between previous studies were caused by differences in duration of restriction and time of the day of the measurements. Therefore, in the present study the plasma corticosterone concentration and the H/L ratio were again determined in restricted- and ad libitum-fed growing broiler breeders, taking possible causes of disagreement between previous studies into account. In addition, we measured the daily rhythm in body temperature and heart rate, and the corticosterone responses to an acute stressor as physiological indices of stress. 2. Female broiler breeders (64 per treatment, housed in groups of 4 birds) were used in the experiment. Behaviour, baseline plasma corticosterone concentrations and H/L ratio were determined at 21 d of age (immediately after the start of food restriction), and at 42 and 63 d of age. Body temperature, heart rate and activity were measured by radiotelemetry for 36 h at 49 and 70 d of age. In addition, the plasma corticosterone response to acute stress (5 min manual restraint) was measured at 77 or 78 d of age. 3. Restricted broiler breeders had higher plasma corticosterone concentrations at 42 and 63 d of age, but no differences in H/L ratio were found between restricted birds and unrestricted control birds. Restricted broiler breeders had a higher corticosterone response to 5 min manual restraint than unrestricted birds. Restricted birds displayed a clear day-night rhythm in body temperature, heart rate and activity whereas such a rhythm was blunted in ad libitum-fed birds. 4. It is discussed that some physiological differences (plasma corticosterone concentrations, body temperature and heart rate) between ad libitum-fed and restricted broiler breeders may have been caused by differences in metabolic rate as well as by differences in the level of stress. I
Tibiale dyschondroplasiebij kalkoenen: tweede proef: het verschil tussen hanen en hennen.
Veldkamp, T. ; Voorst, S. van; Wiers, W.J.W. - \ 2001
De Pluimveehouderij 31 (2001)48. - ISSN 0166-8250 - p. 18 - 19.
kalkoenen - pluimvee - diergeneeskunde - dyschondroplasie - botziekten - geslacht (sex) - proefopzet - geslachtsdiagnose - statistische analyse - proeven - prestatieniveau - dierfysiologie - turkeys - poultry - veterinary science - dyschondroplasia - bone diseases - sex - experimental design - sex diagnosis - statistical analysis - trials - performance - animal physiology
De mate van TD was bij de hanen gemiddeld ernstiger dan bij de hennen
Eerste proef: effect temperatuur en kalkoenlijn: Tibiale Dyschondroplasie bij kalkoenen.
Veldkamp, T. ; Voorst, S. van - \ 2001
De Pluimveehouderij 31 (2001)26. - ISSN 0166-8250 - p. 10 - 11.
pluimveehouderij - pluimveeziekten - kalkoenen - bewegingsstoornissen - dyschondroplasie - botziekten - diergeneeskunde - proeven - omgevingstemperatuur - groei - poultry farming - poultry diseases - turkeys - movement disorders - dyschondroplasia - bone diseases - veterinary science - trials - environmental temperature - growth
Het PV richt zich in een internationaal onderzoek op de effecten van omgevingstemperatuur, kalkoenenlijn, sekse, lichtschema, voerbeperking en 1,25 dihydrocholecalciferol op het onstaan van TD. In dit artikel aandacht voor de factoren omgevingstemperatuur en kalkoenenlijn
Derde proef: meer TD bij lijnen die snel groeien : tibiale dyschondroplasie bij kalkoenen
Veldkamp, T. ; Wiers, W.J.W. ; Voorst, S. van - \ 2001
De Pluimveehouderij 32 (2001)37. - ISSN 0166-8250 - p. 22 - 23.
kalkoenen - pluimvee - diervoedering - voer - groeisnelheid (slachtvee) - gewicht - diergeneeskunde - dyschondroplasie - botziekten - bewegingsstoornissen - functionele stoornissen - onderzoek - productie - turkeys - poultry - animal feeding - feeds - liveweight gain - weight - veterinary science - dyschondroplasia - bone diseases - movement disorders - functional disorders - research - production
Verslag van onderzoek naar het effect van vier kalkoenenlijnen op de ontwikkeling van TD. De lijnen verschillen in groeisnelheid en borstbreedte. De artikelen over de eerste en tweede proef staan in Pluimveehouderij 2001 nrs 26 en 48, pagina's 10/11 en 18/19
Voermethoden en welzijn in de opfokperiode van vleeskuikenouderdieren
Haar, J.W. van der; Voorst, A. van; Jong, I.C. de; Kiezebrink, M.C. ; Middelkoop, J.H. van - \ 2001
Lelystad : Praktijkonderzoek Veehouderij (Rapport / Praktijkonderzoek Veehouderij 211) - 34
vleeskuikens - pluimvee - diervoedering - dierenwelzijn - vleeskuikenouderdieren - voedersystemen - broilers - poultry - animal feeding - animal welfare - broiler breeders - feeding systems
Praktijkonderzoek Veehouderij heeft twee proeven uitgevoerd die gericht waren op het ontwikkelen van managementmaatregelen die de negatieve effecten van het beperkt voeren van vleeskuikenouderdieren in de opfokperiode verminderen. Beide proeven werdenuitgevoerd met Ross 508 hennen. In de eerste proef werd het effect van voerverstrekking in het strooisel onderzocht en in de tweede proef naast dit effect ook dat van tweemaal per dag voeren.
Het achterwege laten van ingrepen bij vleeskuikenouderdieren
Haar, J.W. van der; Voorst, A. van; Kiezebrink, M.C. ; Middelkoop, J.H. van - \ 2001
Lelystad : Praktijkonderzoek Veehouderij (Rapport / Praktijkonderzoek Veehouderij 210) - 29
vleeskuikens - kippen - dierenwelzijn - pluimvee - voortplanting - broilers - fowls - animal welfare - poultry - reproduction
Door het Ingrepenbesluit zijn ingrepen bij vleeskuikenouderdieren op termijn verboden. Praktijkonderzoek Pluimveehouderij is daarom in 1998 gestart met onderzoek naar het effect van het achterwege laten van ingrepen bij vleeskuikenouderdieren. De resultaten van twee proeven worden in dit rapport beschreven.
Welzijn (opfok) vleeskuikenouderdieren
Haar, J. van der; Voorst, S. van - \ 2001
Praktijkonderzoek. Pluimvee 15 (2001)1. - ISSN 1570-2537 - p. 21 - 25.
voedering - diervoedering - dierenwelzijn - diergedrag - diergezondheid - opfoktechnieken - vleeskuikenouderdieren - feeding - animal feeding - animal welfare - animal behaviour - animal health - rearing techniques - broiler breeders
Praktijkcentrum 'Het Spelderholt' heeft in samenwerking met ID-Lelystad onderzocht of tweemaal in plaats van eenmaal per dag voeren in de opfokperiode het welzijn van vleeskuikenouderdieren verbetert. Hiermee werd niet het verwachte effect op het gedrag verkregen.
|Voederbeperking en stress bij moederdieren: op zoek naar parameters die welzijn meten
Jong, I.C. de; Voorst, S. van - \ 2001
De Pluimveehouderij 31 (2001)34. - ISSN 0166-8250 - p. 20 - 22.
pluimveehouderij - pluimveevoeding - diergedrag - dierenwelzijn - voedingsrantsoenen - voedingsbehoeften - stress - vleeskuikenouderdieren - poultry farming - poultry feeding - animal behaviour - animal welfare - feed rations - feed requirements - broiler breeders
Bij vleeskuikenouderdieren is stress door chronische honger een probleem. ID Lelystad onderzoekt nieuwe management- of voerstrategiën waarmee het welzijn van vleeskuikenouderdieren in de opfok valt te verbeteren
Determination of the circadian rhythm in plasma corticosterone and catecholamine concentrations in growing broiler breeders using intravenous cannulation
Jong, I.C. de; Voorst, A. van; Erkens, J.H.K. ; Ehlhardt, D.A. ; Blokhuis, H.J. - \ 2001
Physiology and Behavior 74 (2001). - ISSN 0031-9384 - p. 299 - 304.