Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Handvatten voor vermindering geuroverlast bij varkens- en pluimveebedrijven
    Ellen, H.H. ; Aarnink, A.J.A. ; Harn, J. van; Huis in 'T Veld, J.W.H. - \ 2014
    Wageningen : Wageningen UR Livestock Research (Livestock research rapport 789) - 37
    varkenshouderij - varkens - pluimvee - pluimveehouderij - vleeskuikens - kalkoenen - hennen - stankbestrijding - agrarische bedrijfsvoering - klimaatregeling - hokken - bedrijfshygiëne - strooisel - luchtreinigers - pig farming - pigs - poultry - poultry farming - broilers - turkeys - hens - odour abatement - farm management - air conditioning - pens - industrial hygiene - litter (plant) - air cleaners
    Via bedrijfsbezoeken aan varkens- en pluimveebedrijven is gezocht naar maatregelen die de belasting van geur op de omgeving kunnen verminderen. Naast technische oplossingen zoals de luchtsnelheid en -richting, is vooral gekeken naar het gevoerde management. Voor de varkenshouderij is daarbij het voorkomen van hokbevuiling via klimaatbeheersing en hokindeling en -inrichting een belangrijke maatregel. Voor vleeskuikens is de keuze van het strooisel mogelijk een belangrijke factor en voor leghennen het zorgen voor een dunne strooisellaag. Het toepassen van luchtreinigingstechnieken of maskering van de geur door toevoegingen is alleen economisch interessant als de hoeveelheid ventilatielucht kan worden beperkt.
    Phosphorus requirement in laying hens
    Lambert, W. ; Krimpen, M.M. van; Star, L. - \ 2014
    Lelystad : Schothorst Feed Research (Report / Schothorst Feed Research 1362-2) - 48
    hennen - fosfor - voedingsstoffenbehoeften - pluimveevoeding - voedersupplementen - diergezondheid - pluimveehokken - hens - phosphorus - nutrient requirements - poultry feeding - feed supplements - animal health - poultry housing
    It was hypothesized that P supply by feed in alternative housing systems can be lowered without negative effects on bone quality and production performance. Therefore, the objectives of the current study were 1) to update the retainable phosphorus (rP) needs of two modern laying hen breeds from 36 to 90 weeks of age housed in an aviary system, 2) to investigate the influence of dietary rP levels on Ca and P content in eggs, manure, carcasses and bones.
    Feather pecking and monoamines - a behavioral and neurobiological approach
    Kops, M.S. - \ 2014
    Wageningen University; Utrecht University. Promotor(en): B. Olivier; O. Güntürkün, co-promotor(en): S.M. Korte; Liesbeth Bolhuis. - Utrecht, The Netherlands : Utrecht University - ISBN 9789039361283 - 172
    pluimveehouderij - hennen - verenpikken - diergedrag - dierenwelzijn - pluimvee - diergezondheid - dierlijke productie - serotonine - dopamine - fenotypen - genotypen - neurotransmitters - invloeden - poultry farming - hens - feather pecking - animal behaviour - animal welfare - poultry - animal health - animal production - serotonin - dopamine - phenotypes - genotypes - neurotransmitters - influences
    Severe feather pecking (SFP) remains one of the major welfare issues in laying hens. SFP is the pecking at and pulling out of feathers, inflicting damage to the plumage and skin of the recipient. The neurobiological profile determining the vulnerability of individual hens to develop into a severe feather pecker is unknown, although brain monoamines such as serotonin (5-HT) and dopamine (DA) seem to play a role. Previous studies related lower 5-HT and DA turnover ratios to an increased risk to develop SFP.In this thesis, monoamine levels in brain areas involved in emotional regulation and motor control were compared between phenotypically and genetically selected high and low feather peckers at different ages. It was found that adult high feather peckers had higher monoaminergic activity (lower metabolite levels and/or turnover ratios) in comparison to low feather peckers, which is in contrast with results on young hens. Differences were seen in several brain areas, namely the dorsal thalamus, medial striatum, amygdala, caudocentral nidopallium, and the somatomotor arcopallium, but to a lesser extend or not in the caudolateral nidopallium and the hippocampus. To investigate the exact neurobiological mechanism behind severe feather pecking further extracellular levels of 5-HT and DA and their metabolites were measured by in vivo microdialysis. Up till now, microdialysis has only been executed in young chickens, but this thesis describes the first microdialysis study performed in adult laying hens. It was found that adult severe feather peckers had a higher baseline release of 5-HT in the caudal nidopallium, a large associative area in the chicken’s forebrain. This result could not be explained by the amount of 5-HT presynaptically stored, as both high and low SFP lines displayed a similar 5-HT release after d-fenfluramine administration. This confirms that genetic selection on SFP has altered the serotonergic system in feather pecking-phenotypes. With clear phenotypic and genotypic differences in brain areas related to emotional regulation and motor control, it can be assumed that brain deficits at a young age increase an individual’s vulnerability to stressful environmental changes, which is associated with the prevalence of SFP later in life. The cause of the inversion of neurochemical patterns in young and adult high and low feather pecking hens remains to be elucidated. Perhaps this inversion is caused by development itself. On the other hand, higher behavioral patterns (SFP and other types of allopecking) observed in the high feather pecking chickens might have influenced the monoaminergic activity since the brain influences behavior and vice versa. Altogether, this thesis demonstrates the importance of considering the impact of genetic selection and also environmental conditions on brain neurotransmission and with that, on the vulnerability of individual chickens to develop SFP. Both the serotonergic and dopaminergic systems are involved in the development of SFP. With SFP being a multifactorial problem both genotype and phenotype have to be taken into account. Furthermore, in vivo microdialysis is a valuable approach to investigate why individual laying hens start SFP. This will lead to further understanding and ultimately in the reduction of SFP.
    Animal welfare decisions in Dutch poultry and pig farms
    Gocsik, E. - \ 2014
    Wageningen University. Promotor(en): Alfons Oude Lansink, co-promotor(en): Helmut Saatkamp; Ivo van der Lans. - Wageningen : Wageningen University - ISBN 9789462571624 - 261
    dierenwelzijn - dierlijke productie - pluimvee - varkens - investering - economie - varkenshouderij - pluimveehouderij - huisvesting, dieren - agrarische productiesystemen - vleeskuikens - hennen - animal welfare - animal production - poultry - pigs - investment - economics - pig farming - poultry farming - animal housing - agricultural production systems - broilers - hens

    Abstract

    The minimum level of animal welfare (AW) is guaranteed by EU and national legislation in most European countries. Within the current international economic and political environment further improvements in the welfare of farm animals predominantly rely on market initiatives. Market initiatives set requirements in terms of AW that exceed the legal minimum standards. Participation in a particular market initiative is a voluntary choice of the farmer. The overall objective of this dissertation was to analyze the factors that determine farmers’ decision-making with regard to the implementation of AW standards, and to identify barriers to the adoption of above-legal AW standards at farm level. In this dissertation farmers’ decision-making is conceptualized as a process in which farmers trade off financial and non-financial goals. Financial goals relate to monetary aspects, whereas non-financial goals appeals to farmers’ intrinsic motivation to improve AW. This dissertation suggests that broiler and fattening pig farmers do not have a strong intrinsic motivation to switch to a production system that provides higher level of AW than the minimum legal requirements. In this respect, at farm level certain financial preconditions have to be met to enable farmers to adopt higher AW standards. More specifically, farmers require a price premium that is at least sufficient to cover extra costs as a result of higher animal welfare standards. Furthermore, it is important to manage the (perceived) uncertainty of the market and price premiums. These imply that middle-market segment could be attractive for farmers due to its high cost-efficiency, i.e., realize the highest relative increase in AW at the lowest costs, which is also in the best interest of other stakeholders in the supply chain. Furthermore as switching to a middle-market system primarily affects variable costs farmers are given the flexibility to revert to the conventional system if their expectations are not met. Middle-market segment products, as they improve on many production attributes related to AW, may also offer alternatives for consumers that take many attributes into account to form an opinion of the animal friendliness of a production system. In the light of the foregoing, further development of the middle-market segment appears to be a reasonable direction in improving AW. In order to facilitate the further development of the middle-market segment a high involvement of all stakeholders in the supply chain, i.e., slaughterhouses, processors, retail, NGOs, and the government as well is required.

    Ammoniakvorming in mestdroogsystemen op legpluimveebedrijven met mestbandbeluchting = Ammonia production in manure drying systems at layer farms with manure belt aeration
    Winkel, A. ; Blanken, K. ; Ellen, H.H. ; Ogink, N.W.M. - \ 2014
    Lelystad : Wageningen UR Livestock Research (Report / Wageningen UR Livestock Research 730) - 20
    pluimveehouderij - hennen - pluimveehokken - ammoniakemissie - emissiereductie - droge stof - mestverwerking - drogen - luchtverontreiniging - poultry farming - hens - poultry housing - ammonia emission - emission reduction - dry matter - manure treatment - drying - air pollution
    In this study, we investigated whether ammonia emissions from manure drying systems can be reduced by pre-drying the manure to ca. 55% of dry matter. This study shows that the ammonia emission of drying manure decreases with dry matter content. Pre-drying of manure to 55% of dry matter prevents the occurrence of high emissions in the first phase of the drying process and can reduce the emission from manure drying systems with 50–60%.
    Emissies uit mestdroogsystemen op leghennenbedrijven bij dagontmesting en versneld drogen = Emissions from manure drying systems on layer farms using 24-h manure removal and rapid drying
    Winkel, A. ; Huis in 'T Veld, J.W.H. ; Nijeboer, G.M. ; Schilder, H. ; Hattum, T.G. van; Ellen, H.H. ; Ogink, N.W.M. - \ 2014
    Lelystad : Wageningen UR Livestock Research (Report / Wageningen UR Livestock Research 731) - 43
    pluimveehouderij - hennen - ammoniakemissie - emissiereductie - pluimveehokken - mestverwerking - drogen - fijn stof - luchtverontreiniging - poultry farming - hens - ammonia emission - emission reduction - poultry housing - manure treatment - drying - particulate matter - air pollution
    In dit onderzoek is de hypothese getoetst dat met het dagelijks afdraaien van alle stalmest naar een mestdroogsysteem (dagontmesting), gevolgd door snelle indroging, de extra ammoniakemissie uit deze droogsystemen aanzienlijk kan worden beperkt. Deze hypothese is bevestigd door het onderzoek. Daarnaast is gebleken dat de aangepaste manier van drogen nog steeds een aanzienlijke fijnstofreductie bewerkstelligt.
    Maatregelen ter vermindering van fijnstofemissie uit de pluimveehouderij: validatie van een oliefilmsysteem op een leghennenbedrijf = Measures to reduce fine dust emission from poultry houses: validation of an oil spraying system on a layer farm
    Winkel, A. ; Huis in 'T Veld, J.W.H. ; Nijeboer, G.M. ; Ogink, N.W.M. - \ 2014
    Lelystad : Wageningen UR Livestock Research (Report / Wageningen UR Livestock Research 801) - 24
    pluimveehouderij - hennen - pluimveehokken - stallen - luchtreinigers - fijn stof - emissiereductie - spuiten - film - plantaardige oliën - monitoring - luchtverontreiniging - poultry farming - hens - poultry housing - stalls - air cleaners - particulate matter - emission reduction - spraying - film - plant oils - monitoring - air pollution
    In this study, the emission reduction of an oil spraying system was determined through validation measurements in a layer house with aviary housing.
    Mogelijkheden voor het vaststellen van emissies van leghennenstallen met een nageschakeld mestdroogsysteem = Possibilities for determining emissions of laying hen houses connected to a manure drying system
    Winkel, A. ; Ellen, H.H. ; Ogink, N.W.M. - \ 2014
    Lelystad : Wageningen UR Livestock Research (Report / Wageningen UR Livestock Research 803) - 20
    pluimveehouderij - hennen - ammoniakemissie - emissiereductie - pluimveehokken - mestverwerking - droging - bepaling - luchtverontreiniging - poultry farming - hens - ammonia emission - emission reduction - poultry housing - manure treatment - drieration - determination - air pollution
    Based on the current state of knowledge, this report explores the possibilities for establishment of emissions for laying hen houses connected to a manure drying system.
    Welzijn van uitgelegde hennen tijdens vangen en vervoer in de winterperiode
    Niekerk, T.G.C.M. van; Gunnink, H. ; Reuvekamp, B.F.J. - \ 2014
    Wageningen : Wageningen UR Livestock Research (Rapport / Wageningen UR Livestock Research 758) - 48
    pluimveehouderij - dierenwelzijn - hennen - pluimvee - diergezondheid - dierlijke productie - transport - vangen van dieren - poultry farming - animal welfare - hens - poultry - animal health - animal production - transport - capture of animals
    24 End-of-lay flocks have been monitored from catching to slaughter to determine various welfare aspects of hens during catching and transport in winter time.
    Verkorte protocollen voor het meten van de effecten van niet-snavelbehandelen bij leghennen, vleeskuikenouderdieren en kalkoenen
    Jong, I.C. de; Niekerk, T.G.C.M. van - \ 2014
    Wageningen : Wageningen UR Livestock Research (Rapport / Wageningen UR Livestock Research 785) - 75
    pluimveehouderij - dierenwelzijn - dierlijke productie - pluimvee - kalkoenen - hennen - vleeskuikenouderdieren - diergezondheid - monitoring - protocollen - snavelkappen - poultry farming - animal welfare - animal production - poultry - turkeys - hens - broiler breeders - animal health - monitoring - protocols - debeaking
    Met ingang van 1 september 2018 zal in Nederland snavelbehandelen bij leghennen, vleeskuikenouderdieren en kalkoenen verboden worden. Doel van dit onderzoek was om op basis van beschikbare literatuur, ervaringen van onderzoekers en ervaringen uit de praktijk protocollen op te stellen waarmee op relatief eenvoudige, maar wel betrouwbare wijze een monitoring van het effect van niet-snavelbehandelen uitgevoerd kan worden. Op basis van literatuuronderzoek, expert consultatie en een beknopt haalbaarheidsonderzoek bij praktijkkoppels zijn protocollen ontwikkeld voor het vastleggen van het effect van het niet-snavelbehandelen bij leghennen (opfok en productie), vleeskuikenouderdieren (opfok en productie) en kalkoenen (vleeskalkoenen). Deze protocollen staan vermeld in de bijlage van dit rapport.
    Social and ethical aspects of (alternatives to) the killing of day-old male chicks
    Bruijnis, Mariëlle - \ 2014
    poultry - hens - killing of animals - animal welfare - animal health - animal production - animal ethics - poultry farming
    Alternatives for killing day-old male chicks
    Woelders, Henri - \ 2014
    poultry - hens - killing of animals - animal welfare - animal health - animal production - poultry farming
    Jaarrapportage onderzoek Animal Welfare Check Points 2013
    Visser, E.K. ; Ouweltjes, W. ; Neijenhuis, F. ; Lourens, A. ; Werf, J.T.N. van der; Gunnink, H. ; Hindle, V.A. ; Verkaik, J.C. ; Binnendijk, G.P. ; Gerritzen, M.A. - \ 2014
    Wageningen : Wageningen UR Livestock Research (Report / Wageningen UR Livestock Research 753) - 89
    dierenwelzijn - transport - slacht - varkens - vleeskuikens - hennen - rundvee - schapen - geiten - diergezondheid - doden van dieren - dierlijke productie - protocollen - veevervoer - animal welfare - transport - slaughter - pigs - broilers - hens - cattle - sheep - goats - animal health - killing of animals - animal production - protocols - transport of animals
    Het project “Animal Welfare Check Points” heeft als doel het ontwikkelen van protocollen voor het beoordelen van het welzijn van slachtdieren tijdens het selecteren en voorbereiden op het primaire bedrijf, tijdens transport en op de slachterij. In de tweede fase van het onderzoek (2013) zijn gegevens verzameld om een idee te krijgen van de gemiddelden en spreiding van de welzijnsparameters in de praktijk. Daarnaast zijn ervaringen opgedaan met de toepassing van de protocollen in de praktijk, en waar nodig zijn protocollen verder aangescherpt.
    The fearful feather pecker : applying the principles to practice to prevent feather pecking in laying hens
    Haas, E.N. de - \ 2014
    Wageningen University. Promotor(en): Bas Kemp; A.G.G. Groothuis, co-promotor(en): Bas Rodenburg; Liesbeth Bolhuis. - Wageningen : Wageningen University - ISBN 9789462570429 - 285
    hennen - verenpikken - bangheid - gedragsproblemen - lijnen - hormonale controle - stressreactie - ontogenie - legresultaten - dierenwelzijn - diergedrag - dierfysiologie - hens - feather pecking - fearfulness - behaviour problems - lines - hormonal control - stress response - ontogeny - laying performance - animal welfare - animal behaviour - animal physiology

    Billions of laying hens are kept worldwide. Severe feather pecking (SFP) is a behaviour which occurs with a high prevalence on commercial farms. SFP, the pecking and plucking of feathers of another bird, induces pain and stress and can ultimately lead to cannibalism. Moreover, SFP can occur if a bird is unable to cope with fear and stress and is living in an inappropriate environment. SFP thus reduces the welfare of many laying hens worldwide. To prevent SFP it is essential to know the risk factors in its development. To that aim, first, two experimental studies were conducted to gain insight in the principles of SFP, and three on-farm studies were conducted to assess the risk factors of SFP under commercial conditions.

    THE PRINCIPLES

    Factors which relate to SFP are high fearfulness as young and low levels of brain and peripheral serotonin (5-HT) and brain dopamine (DA). Furthermore, commercial laying hen lines can differ in SFP tendencies and associated traits indicating that SFP has a genetic component. In chapters 2 and 3, fear response as young and adult, and stress response, 5-HT and DA brain levels as adult were

    compared in hens of two lines: the low mortality line (LML) selected on low levels of mortality due to cannibalism and individual performance vs. the control line (CL) which was selected on individual performance only. Hens were exposed to an Open Field (OF) test at 5 weeks of age and a Manual Restraint (MR) test at 33 weeks of age. At 33 weeks of age, levels of corticosterone (CORT) post MR and 5-HT and DA levels in four brain areas were determined. Hens of the LML were less fearful at both ages and had lower levels of DA in the arcopallium, a somatomotor area involved in fear and motor control, compared to hens of the CL. In chapter 2, it was also shown that fearful chicks had higher levels of CORT and higher activity levels as adult, compared to non-fearful chicks. Moreover,

    presence of fearful animals in the group was related to average CORT levels of their pen members. Fearful hens may induce social instability in a group, and thereby affecting the stress-sensitivity of their group mates. These results indicate that groups differ in levels of fear and stress-sensitivity, and that fearfulness at a young age can lead to stress-sensitivity as adults, which create a risk for development of SFP.

    THE PRACTICE

    In chapters 4, 5 and 6, the laying hen production chain consisting of parent stock, rearing flocks and laying flocks was studied. Risk factors for SFP could originate from previous parts in the chain. Therefore, in all on-farm studies, measurements of SFP, fearfulness, basal CORT and peripheral 5-HT system were obtained, and related to housing conditions and to previous parts in the chain. Fearfulness was assessed, on a flock level, by distance to a stationary person (SP) test and latency

    of bird to approach a novel object (NO). Dekalb White (DW) and ISA brown (ISA) crosses whose pure lines differ in levels of fear, CORT, 5-HT and DA, were compared. First, parent stock (PS) flocks were studied and associations between production performance and measurements of fear, stress and 5-HT were conducted and related to group size conditions (chapter 4). Second, rearing flocks originating from PS flocks were studied throughout the rearing period (chapter 5). High levels of feather damage, CORT and 5-HT in the mothers were related to fearfulness and SFP in their offspring at flock level. Especially, a large flock size and limitation and/or disruption in litter supply affected SFP and levels of fearfulness and 5-HT (chapter 5). Finally, high levels of feather damage during the laying period were related to high SFP rearing, and high fearfulness during rearing and laying (chapter 6). These studies together aimed to determine the risk factors for the development of SFP and the resulting feather damage. The main outcomes of these studies are as follows.

    Ø Parent stock flocks

    DW flocks were more fearful of an SP and hens had higher levels of feather damage than in ISA flocks. ISA flocks, in turn, were more fearful of the NO and hens had higher 5-HT levels than in DW flocks. A small flock size led to higher feed conversion, mortality levels, and smothering events in ISA but not in DW flocks. These results indicate that DW and ISA PS flocks differ in levels of fear and

    feather damage, and respond differently to their social environment. For both crosses, fear of an SP related to high mortality and fear of the NO related to low hen body weight, egg weight, and feed intake. High basal CORT related to low egg weight. High fear and stress levels in PS flocks may, thus, negatively affect (re)production, and thereby potentially negatively influence the developing

    embryo.

    Ø Rearing flocks

    In the DW cross, high CORT, feather damage, and 5-HT of mother hens related to high SFP and fearfulness of their rearing flocks at 1 week of age. At 5 weeks of age, a peak in both gentle feather pecking (GFP) and SFP was recorded, coinciding with a disruption in substrate availability (i.e. a temporal absence of substrate) and a limitation of substrate (i.e. limited amounts of substrate

    provided) in some of the farms. Especially, ISA pullets showed higher SFP under substrate limitation and became more fearful under substrate disruption than DW pullets. ISA pullets had higher 5-HT levels than DW pullets. Only in the ISA cross, high 5-HT related to high fearfulness, specifically under substrate disruption. For both crosses, high fearfulness was related to high feather damage. Furthermore, in a level system (floor system where levels are gradually added) higher levels of SFP and feather damage were found compared to an aviary system (a tier-system with cages and litter area). These results highlight that; 1) parental effects exist in the development of fearfulness and SFP, 2) disruption and limitation in substrate availability can lead to high SFP at 5 weeks of age, 3) ISA pullets are more strongly influenced by environmental conditions than DW pullets and 4) a level housing, which coincided with a large group size, increase the risk of SFP and feather damage during rearing.

    Ø Laying flocks

    In our sample, 49% of the laying flocks had severe damage at 40 weeks of age, compared with 71%, 65% and 53% of the rearing flocks at 15, 10 and 5 weeks of age, respectively. High fear of a SP at rearing and high SFP at 5 weeks of age related to high levels of feather damage at lay. In a floor system and at a large flock size higher levels of feather damage were recorded than in an aviary system and at a small flock size. An adjusted management on the laying farm (i.e. aerated blocks, presence of roosters or a radio playing) reduced levels of feather damage compared to standard management. DW flocks were more fearful of the SP and NO than ISA flocks. This study showed that factors during rearing and laying contributed to feather damage at 40 weeks of age.

    With the knowledge from the experimental and on-farm studies in this thesis, an assessment of the risk factors for SFP could be established. Risk factors for SFP are: high fear, stress and feather damage in DW parent stock, high fear of humans, especially for DW hens, litter disruption or limitation during rearing, large group sizes, and a floor or level system.

    Laying hen performance in different production systems; why do they differ and how to close the gap? Results of discussions with groups of farmers in The Netherlands, Switzerland and France, benchmarking and model calculations
    Leenstra, F.R. ; Maurer, V. ; Galea, F. ; Bestman, M.W.P. ; Amsler, Z. ; Visscher, J. ; Vermeij, I. ; Krimpen, M.M. van - \ 2014
    European Poultry Science 78 (2014)3. - ISSN 1612-9199 - p. 1 - 10.
    pluimveehouderij - hennen - uitloop - biologische landbouw - eierproductie - huisvesting van kippen - pluimveevoeding - dierenwelzijn - poultry farming - hens - outdoor run - organic farming - egg production - chicken housing - poultry feeding - animal welfare - egg-production systems - free-range - feather pecking - risk-factors - welfare - uk
    Free range and organic systems expose the laying hen more to unexpected events and adverse climatic conditions than barn and cage systems. In France, The Netherlands and Switzerland the requirements for a hen suitable to produce in free range and organic systems were discussed with farmers. The farmers preferred for these systems a more 'robust' hen, more specifically defined as a heavier hen with good eating capacity
    Goed in de veren blijven
    Jong, I.C. de; Gunnink, H. ; Rodenburg, T.B. ; Haas, E.N. de - \ 2014
    De Pluimveehouderij 44 (2014)9. - ISSN 0166-8250 - p. 24 - 25.
    pluimveehouderij - huisvesting van kippen - strooisel - verenpikken - dierenwelzijn - kuikens - hennen - diergedrag - diergezondheid - poultry farming - chicken housing - litter (plant) - feather pecking - animal welfare - chicks - hens - animal behaviour - animal health
    Is jong geleerd oud gedaan? WUR Livestock Research heeft onderzoek gedaan naar het belang van strooisel en huisvesting in de opfok voor veren pikken in de vroege leg.
    Leghennenhouderij in diep dal
    Horne, P.L.M. van; Wisman, J.H. - \ 2014
    Agri-monitor 2014 (2014)june. - ISSN 1383-6455 - 3
    pluimveehouderij - hennen - eieren - prijzen - bedrijfsresultaten in de landbouw - rendement - poultry farming - hens - eggs - prices - farm results - returns
    De leghennenhouders ontvangen nu al twee jaar eierprijzen fors onder de kostprijs. Vooral scharrelhennenhouders hebben moeite het hoofd boven water te houden. Het perspectief voor het komende halfjaar is niet gunstig.
    The ideal hen for organic and free range systems
    Maurer, V. ; Amsler, Z. ; Zeltner, E. ; Leenstra, F.R. ; Niekerk, T.G.C.M. van; Reuvekamp, B.F.J. ; Bestman, M.W.P. ; Verwer, C.M. ; Sambeek, F. ; Galea, F. - \ 2014
    pluimveehouderij - biologische landbouw - huisvesting van kippen - hennen - scharrelhouderij - genotypen - diergezondheid - poultry farming - organic farming - chicken housing - hens - free range husbandry - genotypes - animal health
    The aim of LowInputBreeds is to develop a system to evaluate layer genotypes in free range and organic systems and to optimise the management of those systems.
    Voorzichtig positief
    Niekerk, T.G.C.M. van; Reuvekamp, B.F.J. ; Gunnink, H. - \ 2014
    De Pluimveehouderij 44 (2014)1. - ISSN 0166-8250 - p. 18 - 19.
    pluimveehouderij - hennen - snavelkappen - diergedrag - verenpikken - huisvesting van kippen - dierenwelzijn - verlichting - diergezondheid - pluimvee - dierlijke productie - poultry farming - hens - debeaking - animal behaviour - feather pecking - chicken housing - animal welfare - lighting - animal health - poultry - animal production
    Livestock Research heeft twee reguliere leghennenbedrijven gevolgd die zijn begonnen ervaring op te doen met niet-snavelbehandelde hennen.
    Schadevrij op slachterij
    Niekerk, T.G.C.M. van; Reuvekamp, B.F.J. ; Gunnink, H. - \ 2014
    De Pluimveehouderij 44 (2014)4. - ISSN 0166-8250 - p. 28 - 30.
    pluimveehouderij - hennen - dierenwelzijn - slacht - transport - vangen van dieren - beschadigingen - poultry farming - hens - animal welfare - slaughter - transport - capture of animals - injuries
    Een juist management op het legbedrijf kan dierschade bij vangen en vervoer van uitgelegde hennen tegen gaan, zo blijkt uit onderzoek in de winterperiode.
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