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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    Investigation into fishing activity near offshore piplines
    Hintzen, N.T. ; Machiels, M.A.M. - \ 2015
    IJmuiden : IMARES (Report / IMARES Wageningen UR C035/15) - 18
    noordzee - visserij - pijpleidingen - beschadigingen - vissersschepen - bufferzones - risicoanalyse - north sea - fisheries - pipelines - injuries - fishing vessels - buffer zones - risk analysis
    On the North Sea bottom lie numerous pipelines to link oil- or gas offshore drilling units, - platforms and processing stations on land. Although pipeline tubes are coated and covered with protective layers, the pipelines risk being damaged through man-made hazards like anchor dropping and fishing activities with bottom trawls. This study provides, as a proof of concept, a map of fishing intensities in a buffer area around the pipelines that can be used in a GIS application by Fugro to assess risks and advise TAQA Energy B.V. on e.g. additional survey activities. The addition of a fishing intensity layer to the procedure currently applied by Fugro may improve the overall risk assessment for pipeline damages.
    Kwaliteit leveren! : haal bollen met een afwijking eruit : Odrzuccaj chore i porazone cebulki
    Praktijkonderzoek Plant & Omgeving, - \ 2014
    siergewassen - bloembollen - lelies - vermeerderingsmateriaal - kwaliteitscontroles - gewasbescherming - sorteren - beschadigingen - ornamental crops - ornamental bulbs - lilies - propagation materials - quality controls - plant protection - sorting - injuries
    Afbeeldingen van aangetaste bollen van lelies die bij het sorteren verwijderd moeten worden.
    Effect of hiding places, straw and territory on agression in group-housed rabbit does
    Rommers, J.M. ; Reuvekamp, B.F.J. ; Gunnink, H. ; Jong, I.C. de - \ 2014
    Applied Animal Behaviour Science 157 (2014). - ISSN 0168-1591 - p. 117 - 126.
    oryctolagus-cuniculus l - laboratory rabbits - breeding rabbits - behavior - injuries
    Group-housing of rabbit does may be preferred from welfare point of view. However, group-housing causes agonistic behaviour which may cause severe injuries. Severe injuries may be prevented by offering hiding places for attacked does. Providing enrichment (straw) may reduce agonistic behaviour by attracting attention from fighting. In contrast, acquisition of a territory within a group may evoke aggression. An experiment was conducted in which the effect of hiding places, straw and territory on aggression in intermittent group-housed rabbit does was studied. The group-housing system consisted of four adjacent enriched individual cages that had been transformed into one group pen for four does by taking out three side walls. Group pens were 1.0 m × 1.5 m × 0.6 m (length × width × height). Does were housed individually until 18 days of lactation. As of day 18 of lactation, four multiparous hybrid does (Hycole) with their kits were housed in a group until 35 days of lactation. All combinations of the following factors were randomly assigned: hiding places (platform and PVC pipe), straw and territory (i.e. familiarity with the cage before grouping) (8 treatments). Sixteen pens were used during 5 successive lactations of 35 days (n = 10/treatment). Behavioural observations were performed at two afternoons at the start and end of the group-housing period of each lactation and skin injuries were registered on 4, 7, 10, 14 and 17 days after being group-housed. Does were resting 70% of the observed time. Does with territory showed significantly more comfort behaviour than does without territory (13% vs. 9% of the observed time, respectively; P <0.05). At start does showed less comfort behaviour and more locomotion than at the end of the group-housing period (7% vs. 15% and 2% vs. 1% of the observed time, respectively; P <0.05). Occupation with straw, stereotyped behaviour and fights were only observed in 4%, 3% and 0.3% of the does, respectively. There were no differences in skin injuries between treatments. Overall 52% of the does had injuries. The percentage of does that had severe injuries ranged between 13% and 39%. Treatments with hiding places had the lowest numerical percentage of severe injuries and there was a tendency (P <0.1) for less culled does in this treatment. In conclusion, does do not defend a territory within a group pen. Hiding places can help to reduce severe skin injuries. However, the high amount of does with skin injuries merits further study.
    Continuous light on tomato : from gene to yield
    Velez Ramirez, A.I. - \ 2014
    Wageningen University. Promotor(en): Harro Bouwmeester, co-promotor(en): Wim van Ieperen; Dick Vreugdenhil. - Wageningen : Wageningen University - ISBN 9789462570788 - 214
    solanum lycopersicum - tomaten - licht - gewasproductie - gewasopbrengst - genen - tolerantie - lichtregiem - beschadigingen - plantenfysiologie - solanum lycopersicum - tomatoes - light - crop production - crop yield - genes - tolerance - light regime - injuries - plant physiology

    Light essentially sustains all life on planet earth surface. Plants transform light energy into chemical energy through photosynthesis. Hence, it can be anticipated that extending the daily photoperiod, using artificial light, results in increased plant productivity. Although this premise is true for many plant species, a limit exists. For instance, the seminal work of Arthur et al. (1930) showed that tomato plants develop leaf injuries if exposed to continuous light (CL). Many studies have investigated the physiological mechanism inducing such CL-induced injury. Although important and valuable discoveries were done over the decades, by the time the present project started, a detailed and proven physiological explanation of this disorder was still missing. Here, I present the results of a 5-year effort to better understand the physiological basis of the CL-induced injury in tomato and develop the tools (genetic and conceptual) to cultivate tomatoes under CL.

    After an exhaustive literature search, it was found that Daskaloff and Ognjanova (1965) reported that wild tomato species are tolerant to CL. Unfortunately, this important finding was ignored by numerous studies done after its publication. Here, we used the CL-tolerance found in wild tomatoes as a fundamental resource. Hence, the specific objectives of this thesis were to (i) better understand the physiological basis of the CL-induced injuries in tomato, (ii) identify the gene(s) responsible for CL-tolerance in wild tomato species, (iii) breed a CL-tolerant tomato line and (iv) use it to cultivate a greenhouse tomato crop under CL.

    Chapter 1 describes how innovation efforts encountered the unsolved scientific enigma of the injuries that tomato plants develop when exposed to CL. The term CL-induced injury is defined, and a detailed description of the symptoms observed in this disorder is shown. Additionally, an overview of the most important studies, influencing the hypotheses postulated and/or tested in this dissertation, is presented. Finally, a description and motivation of the main questions that this dissertation pursued to answer is presented alongside a short description of the strategy chosen to answer them.

    Chapter 2 reviews the literature, published over the last 80 years, on CL-induced injury using modern knowledge of plant physiology. By doing so, new hypotheses aiming to explain this disorder are postulated in addition to the ones collected from literature. Additionally, we highlight that CL is an essential tool for understanding the plant circadian clock, but using CL in research has its challenges. For instance, most of the circadian-clock-oriented experiments are performed under CL; consequently, interactions between the circadian clock and the light signalling pathway are overlooked. This chapter is published here.

    Chapter 3 explores the benefits and challenges of cultivating CL-tolerant tomato under CL. Considering that current commercial tomato varieties need six hours of darkness per day for optimal growth, photosynthesis does not take place during a quarter of the day. Hence, if tomatoes could be grown under CL, a substantial increase in production is anticipated. A simulation study is presented, which shows that if an ideal continuous-light-tolerant tomato genotype is used and no crop adaptations to CL are assumed, greenhouse tomato production could be 26% higher when supplementing light to 24 h day-1 in comparison with a photoperiod (including supplementary lighting) of only 18 h day-1. In addition, the expected changes in greenhouse energy budgets and alterations in crop physiological responses that might arise from cultivating tomatoes under continuous light are discussed. This chapter is published here.

    Chapter 4 maps the locus conferring CL-tolerance in wild tomatoes to chromosome seven, and shows that its introgression into modern tomato cultivars enhances yield by 20%, when grown under CL. In addition, genetic evidence, RNAseq data, silencing experiments and sequence analysis all point to the type III Light-Harvesting Chlorophyll a/b Binding protein 13 (CAB-13) gene as a major factor responsible for the tolerance. In Arabidopsis thaliana this protein is thought to have a regulatory role in balancing light harvesting by photosystems I and II. The likely mechanisms that link CAB-13 with CL-tolerance are discussed. This chapter is published here.

    Chapter 5 investigates from which part of the plant CL-tolerance originates and whether this trait acts systemically. By exposing grafted plants bearing both tolerant and sensitive shoots to CL, the trait was functionally located to the shoot rather than the roots. Additionally, an increase in continuous-light tolerance was observed in sensitive plants when a continuous-light-tolerant shoot was grafted on it. Our results show that in order to increase yield in greenhouse tomato production by using CL, the trait should be bred into scion rather than rootstock lines.

    Chapter 6 discusses the factors that differ between injurious and non-injurious light regimes. Each of these factors may potentially be responsible for triggering the injury in CL-grown tomato and was experimentally tested here. In short, these factors include (i) differences in the light spectral distribution between sunlight and artificial light, (ii) continuous signalling to the photoreceptors, (iii) constant supply of light for photosynthesis, (iv) constant photo-oxidative pressure, and (v) circadian asynchrony — a mismatch between the internal circadian clock frequency and the external light/dark cycles. The evidence presented here suggests that the continuous-light-induced injury does not result from the unnatural spectral distribution of artificial light or the continuity of the light per se. Instead, circadian asynchrony seems to be the factor inducing the injury. As the discovered diurnal fluctuations in photoinhibition sensitivity of tomato seedlings are not under circadian control, it seems that circadian asynchrony does not directly induce injury via photoinhibition as it has been proposed.

    Chapter 7 investigates a possible role for phytochromes (PHY) in CL-induced injury in tomato. Mutant and transgenic tomato plants lacking or over-expressing phytochromes were exposed to CL, with and without far-red light enrichment, to test the role of individual phytochromes on the induction and/or prevention of injury. PHYA over-expression confers complete tolerance to CL regardless the light spectrum. Under CL with low far-red content, PHYB1 and PHYB2 diminished and enhanced the injury, respectively, yet the effects were small. These results confirm that phytochrome signaling networks are involved in the injury induction under CL. The link between CAB-13 and PHYA is discussed.

    Chapter 8 investigates the role of carbohydrate accumulation in the induction of CL-induced injury in tomato by using untargeted metabolomics and transcriptomics data. These data reveal a clear effect of CL on sugar metabolism and photosynthesis. A strong negative correlation between sucrose and starch with the maximum quantum efficiency of photosystem II (Fv /Fm) was found across several abnormal light/dark cycles, supporting the hypothesis that carbohydrates play an important role in CL-induced injury. I suggest that CL-induced injury in tomato is caused by a photosynthetic down-regulation showing characteristics of both cytokinin-regulated senescence and light-modulated retrograde signaling. Molecular mechanisms linking carbohydrate accumulation with photosynthetic down-regulation are discussed.

    Chapter 9 provides a synthesis of the most important findings and proposes a generic model of CL-induced injury in tomato. I propose that CL-induced injury in tomato arises from retrograde signals that counteract signals derived from the cellular developmental program that promote chloroplast development, such that chloroplast development cannot be completed, resulting in the chlorotic phenotype. Finally, perspectives on what future directions to take to further elucidate the physiological basis of this trait and successfully implement it in greenhouses are presented.

    Social network analysis predicts health behaviours and self-reported health in African villages
    Chami, G.F. ; Ahnert, S.E. ; Voors, M.J. ; Kontoleon, A.A. - \ 2014
    PLoS ONE 9 (2014)7. - ISSN 1932-6203
    systematic analysis - global burden - 187 countries - disease - identification - mortality - injuries
    The provision of healthcare in rural African communities is a highly complex and largely unsolved problem. Two main difficulties are the identification of individuals that are most likely affected by disease and the prediction of responses to health interventions. Social networks have been shown to capture health outcomes in a variety of contexts. Yet, it is an open question as to what extent social network analysis can identify and distinguish among households that are most likely to report poor health and those most likely to respond to positive behavioural influences. We use data from seven highly remote, post-conflict villages in Liberia and compare two prominent network measures: in-degree and betweenness. We define in-degree as the frequency in which members from one household are named by another household as a friends. Betweenness is defined as the proportion of shortest friendship paths between any two households in a network that traverses a particular household. We find that in-degree explains the number of ill family members, whereas betweenness explains engagement in preventative health. In-degree and betweenness independently explained self-reported health and behaviour, respectively. Further, we find that betweenness predicts susceptibility to, instead of influence over, good health behaviours. The results suggest that targeting households based on network measures rather than health status may be effective for promoting the uptake of health interventions in rural poor villages.
    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.
    The effects of electric pulse stimulation on cultured adult cod, continued research 2013
    Haan, D. de; Soetaert, M. ; Verschueren, B. - \ 2013
    IJmuiden : IMARES (Report / IMARES Wageningen UR C183/13) - 21
    pulsvisserij - vis vangen - vistuig - kabeljauw - beschadigingen - pulse trawling - fishing - fishing gear - cod - injuries
    In this experiment a toal of 83 adult cod were exposed, 53 specimen were exposed at 60 V and 30 specimen twice above the maximum commercially applied amplitude (120 V). In 5 cases vertebral injuries occurred of which 4 at 120 V and a single one at 60 V. When the type of stimulus is taken in account this single injury at 60 V amplitude represents an injury rate of 4.5 % of 22 exposed fish and 13% at 120 V (4 oout 30 specimen). Despite the same electrical parameters were set, none of the 21 fish exposed to the ILVO pulse generator was injured. All injuries occurred using the Delmeco TX68 pulse shape.
    Waarnemingen van Bruinvissen in maart 2013 vanaf een zandzuiger in het slijkgat bij Ouddorp
    Leopold, M.F. ; Baptist, M.J. ; IJsseldijk, L. ; Engels, B. - \ 2013
    Den Burg : IMARES (Rapport / IMARES Wageningen UR C096/13) - 34
    zeezoogdieren - mariene gebieden - beschadigingen - mortaliteit - inventarisaties - noordzee - marine mammals - marine areas - injuries - mortality - inventories - north sea
    Jaarlijks spoelen in Nederland honderden bruinvissen dood aan op de kust. Onderzoek heeft laten zien dat “scherp trauma" (snij- en rijtwonden, amputaties) veelvuldig voorkomt. Vanaf 2005 hadden gemiddeld 14.4% van de gestrande bruinvissen scherp trauma, met uitschieters tot 20.5% in 2012 en 21.4% in 2010. Veel gevallen van scherp trauma worden gemeld van de kop van Goeree, in de eerste maanden van het jaar. Dieren worden hier vaak ernstig verminkt, maar in verse toestand gevonden. Dit doet vermoeden dat deze dieren vlak onder de kust gewond zijn geraakt. De eerste verminkte bruinvissen werden rond Ouddorp opgemerkt in 2006 (Leopold & Camphuysen 2006) en zijn sindsdien jaarlijks gevonden, al waren er in 2011 opvallend weinig in vergelijking met andere jaren. De aantallen lagen in 2012 en 2013 fors hoger dan in eerdere jaren.
    Gedrag van schieraal rond het krooshek voor gemaal IJmuiden. DIDSON metingen.
    Keeken, O.A. van; Burggraaf, D. ; Tribuhl, S.V. ; Winter, H.V. - \ 2010
    IJmuiden : IMARES (Rapport / IMARES Wageningen UR nr. C049/10) - 34
    waterbeheer - vismigratie - dierenbescherming - beschadigingen - diergedrag - palingen - european eels - pompstations - monitoring - noord-holland - water management - fish migration - animal protection - injuries - animal behaviour - eels - european eels - pumping stations - monitoring - noord-holland
    In opdracht van Rijkswaterstaat wordt door meerdere onderzoeksinstellingen onderzoek gedaan naar de passeerbaarheid van het gemaal in het Noordzeekanaal bij IJmuiden en vermindering van visschade door aangepaste gemaalregimes. In deze rapportage wordt het gedrag van schieraal bij het krooshek voor het gemaal gepresenteerd, wat gemeten is met behulp van de akoestische camera DIDSON. DIDSON staat voor 'Dual frequency IDentification SONar' en is een hoge resolutie sonar die akoestiek (geluid) gebruikt om akoestische beelden te maken met veel meer detail dan de conventionele sonars.
    Praktijktips door uitwisseling van kennis en ervaringen
    Kool, S.A.M. de - \ 2010
    Gewasbescherming 41 (2010)2. - ISSN 0166-6495 - p. 79 - 81.
    samenwerking - inundatie - duurzaamheid (sustainability) - bloembollen - oogstschade - ziektepreventie - beschadigingen - kennisoverdracht - bedrijfshygiëne - cooperation - flooding - sustainability - ornamental bulbs - crop damage - disease prevention - injuries - knowledge transfer - industrial hygiene
    In wisselwerking tussen onderzoekers, adviseurs en het bedrijfsleven ontstaan vaak waardevolle praktijktips voor de telers. Zo ook in de bloembollenteelt. De aanleiding is vrijwel altijd een vraag vanuit de praktijk. Loonwerkers, adviseurs, toeleveranciers en onderzoekers hebben al diverse vragen aangepakt. Drie voorbeelden geven aan hoe de uitgaven verduurzaming ondersteunen.
    Percussion and electrical stunning of Atlantic salmon (Salmo salar) after dewatering and subsequent effect on brain and heart activities nd subsequent
    Lambooij, E. ; Grimsboe, E. ; Vis, J.W. van de; Reimert, H.G.M. ; Nortvedt, R. ; Roth, B. - \ 2010
    Aquaculture 300 (2010)1-4. - ISSN 0044-8486 - p. 107 - 112.
    catfish clarias-gariepinus - current duration - field strength - slaughter - injuries - fresh - l.
    The overall objective of the study was to evaluate a percussive and an electrical stunning method under laboratory conditions in Atlantic salmon. Evidence of unconsciousness and insensibility of the salmon was provided on the electroencephalogram (EEG) by the appearance of slow waves and spikes, followed by a strong depression in electrical activity. This phenomenon was observed in 17 salmon after percussive stunning using an air pressure of 8.1 to 10 bars, whilst 8 fish were considered conscious at pressures below 8.1 bars although some were seemingly unconscious on behaviour. Consequences were a haemorrhage in the brain cavity in 15 out of 17 fish, broken upper or lower jaws in 9 fish and eye burst in 8 fish. A general epileptiform insult (unconscious and insensible) was obtained by delivering a voltage, consisting of a direct current (DC) coupled with 100 Hz alternating current (AC) with a peak value of ˜112 volt (V), head to body, for ˜ 0.5 s. The total duration of the insult was 62 ± 44 s (mean ± SD; n = 25) which was followed by minimal brain activity in 19 fish. The heart rate was 20 ± 7 beats/min prior to stunning. After stunning the electrocardiogram (ECG) revealed fibrillation for 22 ± 15 s and became irregular and showed extra systolae (ventrical contraction) afterwards. Exposing the salmon for 5 s with electricity followed by a gill cut resulted that 1 out of 3 fish recovered temporary after 3 min. Haemorrhages were not observed in the fillets. Average current for head to body electrical dry stunning was 668 milliampere (mA) root mean square (RMS) with an average stunning voltage of 107.9 Vrms. Electrical head to body stunning can be recommended when using coupled AC and DC current of 668 mArms and ˜ 107 Vrms. The salmon can be stunned in ˜ 0.5 s. However, a correct bleeding procedure should be developed. For percussive stunning we conclude that if sufficient force is used the fish will be rendered unconscious insensible which result in damage of the carcass, whereas a combined AC and DC can be recommended source for dry electrical head to body stunning.
    Relatie bodembesmetting met Colletotrichum coccodes en zwarte spikkel op aardappel
    Bus, C.B. - \ 2009
    Lelystad : PPO AGV (PPO rapport 3250101100) - 25
    aardappelen - kwaliteit na de oogst - schil - beschadigingen - colletotrichum coccodes - besmetting - desinfectie - potatoes - postharvest quality - peel - injuries - colletotrichum coccodes - contamination - disinfection
    De uitwendige kwaliteit van in Nederland geteelde tafelaardappelen schiet vaak te kort. Een van de oorzaken is aantasting van de schil door zwarte spikkel. Problemen zouden voorkomen kunnen worden als, met de schimmel Collotrichem coccodes (Cc), besmette percelen tijdig vastgesteld kunnen worden en vervolgens voor de teelt van tafelaardappelen kunnen worden gemeden of met een gerichte maatregel kunnen worden behandeld. In Groot Brittannië is een toets ontwikkeld voor de aanwezigheid van Cc. De toepassing van deze toets voor Nederland is in dit project onderzocht. De bodemtest op aanwezigheid van Colletotrichum coccodes, de veroorzaker van zwarte spikkel, wordt momenteel door de British Potato Council geadviseerd
    Euthanasie van wrakke dieren op het primaire bedrijf. Doden van wrakke dieren
    Hindle, V.A. ; Mul, M.F. ; Kasper, G.J. ; Lambooij, E. - \ 2009
    Lelystad : ASG veehouderij (Rapport / Wageningen UR, Livestock Research 274b) - 24
    vee - beschadigingen - dierziekten - euthanasie - methodologie - dierenwelzijn - wetgeving - dierlijke productie - diergezondheid - Nederland - livestock - injuries - animal diseases - euthanasia - methodology - animal welfare - legislation - animal production - animal health - Netherlands
    On-farm euthanasia of sick and/or injured animals is a problem. A literature survey reveals several authorized methods of euthanasia. These methods were evaluated on criteria as animal welfare, effectiveness, efficiency and aesthetics of operation.
    Innovatienetwerk hyacint zoekt oplossingen voor bolbeschadiging
    Bisschops, B. ; Vreeburg, P.J.M. - \ 2009
    BloembollenVisie 2009 (2009)180. - ISSN 1571-5558 - p. 22 - 23.
    tuinbouwbedrijven - bloembollen - sierplanten - hyacinten - uitselecteren - beschadigingen - bollenoogstmachines - videocamera's - market gardens - ornamental bulbs - ornamental plants - hyacinths - culling - injuries - bulb harvesters - video cameras
    Beschadigingen aan hyacenten die ontstaan tijdens de oogst en verwerking kunnen de teler veel geld kosten en uiteindelijk ook het imago van de hyacint negatief beïnvloeden. Een innovatienetwerkgroep van vijf telers werkte samen met diverse partijen om ne te gaan wat er aan beschadiging is te doen
    Wat te doen na zware hagelschade ; de gevolgen van zomerhagel voor fruitteelt, deel 2
    Steeg, P.A.H. van der; Maas, F.M. - \ 2009
    De Fruitteelt 99 (2009)25. - ISSN 0016-2302 - p. 14 - 15.
    fruitteelt - fruitgewassen - hagelschade - vruchtbomen - beschadigingen - fruit growing - fruit crops - hail damage - fruit trees - injuries
    Na de extreem zware hagel van 22 juni 2008 is op de proeftuin van PPO in Randwijk een aantal proeven gestart, met als doel vervolgschade aan de zwaar beschadigde bomen zoveel mogelijk te voorkomen. In 2009 lijkt de vervolgschade zowel bij PPO in Randwijk als bij andere getroffen telers mee te vallen. Wat zijn de effecten van de diverse maatregelen?
    Zo voorkom je beschadiging van bloembollen : telen met toekomst
    PPO Bomen-bollen, ; Kool, S.A.M. de - \ 2008
    Lelystad : Telen met toekomst - 4
    bloembollen - gewasbescherming - beschadigingen - monsters - schadepreventie - ornamental bulbs - plant protection - injuries - samples - loss prevention
    De Schade Check is een hulpmiddel waarmee nagegaan kan worden waar tijdens de verwerking schade aan de bollen ontstaat. Door monsters te nemen op verschillende momenten tijdens de verwerking wordt zichtbaar waar de bollen het meest beschadigen. Met tips om beschadiging te voorkomen
    Relatie tussen rooibeschadiging, rassenlijstcijfers en PTR-waarden
    Wijnholds, K.H. - \ 2006 2006 (2006)15 dec.
    aardappelen - solanum tuberosum - verliezen bij het oogsten - rooien - oogstschade - beschadigingen - rassen (planten) - fabrieksaardappelen - rassenlijsten - akkerbouw - potatoes - solanum tuberosum - harvesting losses - grubbing - crop damage - injuries - varieties - starch potatoes - descriptive list of varieties - arable farming
    In het kader van het Agrobiokon-programma is onderzoek gedaan naar de mate van gevoeligheid van rassen voor (rooi)beschadiging met als doelen: het vastellen van verschillen tussen rassen in de mate van gevoeligheid voor onderhuidse (rooi)beschadiging, het kwantificeren van de relatie tussen de gemeten waarden van de elektronische aardappel (PTR-200) en de mate van onderhuidse rooibeschadiging (PPO-beschadigingsindex, het vaststellen van de relatie tussen de PPO-beschadigingsindex en de rassenlijstcijfers voor beschadigingsgevoeligheid; bij voldoende consistentie in bovengenoemde relaties datasets voorbereiden voor gebruik in en verbetering van Optirob, een door Agrobiokon ontwikkelde rekenmodule die prognoses voor bewaarverliezen geeft.
    Intacte sporen hanen nadelig voor welzijn hen : gevolgen toepassen Ingrepenbesluit bij vaccindieren
    Jong, I.C. de; Wolthuis, M. - \ 2006
    De Pluimveehouderij 36 (2006)45. - ISSN 0166-8250 - p. 8 - 9.
    pluimveehouderij - pluimvee - diergedrag - sociale dominantie - hanen - paringsgedrag - dierenwelzijn - voortplanting - bevruchting - beschadigingen - hennen - onderzoeksinstituten - wetenschappelijk onderzoek - poultry farming - poultry - animal behaviour - social dominance - cocks - mating behaviour - animal welfare - reproduction - fertilization - injuries - hens - research institutes - scientific research
    Het toepassen van het Ingrepenbesluit bij hanen (niet kammen dubben, niet tenen knippen en niet sporen branden) heeft nadelig effect op (paar)gedrag en technische resultaten (bevruchting) en zorgt voor beschadiging bij hennen en hanen. Dit blijkt uit onderzoek van ASG bij vaccindieren
    Geen effecten van alternatieve voeders : proef met veerkwaliteit opfokvleeskuikenouderdieren
    Emous, R.A. van; Harn, J. van - \ 2003
    De Pluimveehouderij 33 (2003)46. - ISSN 0166-8250 - p. 12 - 13.
    pluimveevoeding - voersamenstelling - beschadigingen - verenkleed - veren (vogel) - diervoedering - vleeskuikenouderdieren - poultry feeding - feed formulation - injuries - plumage - feathers - animal feeding - broiler breeders
    Het Praktijkonderzoek van de Animal Sciences Group van Wageningen UR heeft een kortlopend onderzoek (van 0-10 weken leeftijd) gedaan naar het effect van verschillende gehaltes in het voer op de kwaliteit van het verenkleed bij opfokvleeskuikenouderdieren.
    Teelthandleiding consumptieaardappelen : oogst
    Veerman, A. - \ 2003 2003 (2003)15 sept.
    aardappelen - loofvernietiging - rooien - aardappeloogstmachines - beschadigingen - consumptieaardappelen - akkerbouw - teelthandleidingen - potatoes - haulm destruction - grubbing - potato harvesters - injuries - table potatoes - arable farming - cultivation manuals
    Wanneer de knollen - al of niet na loofvernietiging - voldoende huidvast zijn, kan worden begonnen met rooien. Huidvast zijn de knollen wanneer de schil niet zonder moeite met de duim van de knol is te wrijven. In de keten van de aardappeloogst kunnen op veel plaatsen verschillende soorten knolbeschadigingen (blauw en andere onderhuidse verkleuringen, barsten) optreden. De voorbereidingen voor het oogsten van een schone, gezonde en minimaal beschadigde partij beginnen al ver voor de oogst. Deze voorbereidingen zijn in voorgaande hoofdstukken besproken: gebruik van gezond pootgoed, zorgen voor een goede bodemstructuur, goed pootwerk, een goede rugopbouw, goede ziekte- en plaagbestrijding en een juiste loofvernietiging.
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