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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    Genomic selection for improved crossbred performance
    Lopes, Marcos Soares - \ 2016
    Wageningen University. Promotor(en): Johan van Arendonk, co-promotor(en): Henk Bovenhuis; John Bastiaansen; E.F. Knol. - Wageningen : Wageningen University - ISBN 9789462576315 - 202
    pigs - crossbreds - genomics - selective breeding - performance - genetic improvement - pig breeding - varkens - kruising - genomica - selectief fokken - prestatieniveau - genetische verbetering - varkensfokkerij

    Lopes, M.S. (2016). Genomic selection for improved crossbred performance. PhD thesis, Wageningen University, the Netherlands

    With the implementation of genomic selection in pig breeding, the genetic progress in purebred populations is expected to increase up to 55% compared to traditional selection based on pedigree information. However, as most of the animals in the pork production system are crossbreds, the increase in genetic progress in purebreds will only be observed on production farms if this progress is expressed in the performance of crossbreds. The main aim of this thesis was to evaluate different models based on genomic information which can be applied to improve performance of crossbred animals. Another aim was to gain insight into genetic architecture of (complex) traits and to investigate how selection history has influenced haplotype patterns of current commercial pigs. This thesis shows that by going beyond traditional genomic selection models, phenotypes can be predicted more accurately. Therefore, these improved models should be considered to improve crossbred performance. Further, this thesis provides important insights into the genetic architecture of the evaluated (complex) traits and also shows evidence that human-driven introgression and selection have shaped the genome of current commercial pig breeds. The research presented in this thesis was performed using data from pigs and the discussion on the practical application of results was focused on pig breeding. The results are relevant for all livestock species where crossbreeding is applied.

    Exploiting genomic information on purebred and crossbred pigs
    Hidalgo, A.M. - \ 2015
    Wageningen University. Promotor(en): Martien Groenen, co-promotor(en): D.J. de Koning; John Bastiaansen. - Wageningen : Wageningen University - ISBN 9789462576018 - 202
    varkens - genomica - kruising - inteeltlijnen - genetische verbetering - fokwaarde - drachtigheidsperiode - androstenon - prestatieniveau - varkensfokkerij - diergenetica - pigs - genomics - crossbreds - inbred lines - genetic improvement - breeding value - gestation period - androstenone - performance - pig breeding - animal genetics
    Groepskraamsysteem: analyse van de ontwikkeling van zeugen, biggen en vleesvarkens
    Peet-Schwering, C.M.C. van der; Nieuwamerongen, S.E. van; Bolhuis, J.E. ; Troquet, L.M.P. ; Hoofs, A.I.J. ; Soede, N.M. - \ 2015
    Wageningen : Wageningen UR Livestock Research (Livestock Research rapport 880)
    zeugen - biggen - varkenshouderij - varkensfokkerij - varkens - spenen - kraamhokken - varkensstallen - diergedrag - prestatieniveau - biggen werpen - vee - dierenwelzijn - groepshuisvesting - sows - piglets - pig farming - pig breeding - pigs - weaning - farrowing pens - pig housing - animal behaviour - performance - farrowing - livestock - animal welfare - group housing
    Op VIC Sterksel is de ontwikkeling (groei, voeropname, gezondheid, sociaal gedrag, spelgedrag en beschadigend gedrag) van biggen die opgegroeid zijn in een groepskraamsysteem en na spenen gehuisvest zijn in een verrijkt hok in een groep van 40 biggen vergeleken met de ontwikkeling van biggen die opgegroeid zijn in een traditioneel kraamhok en na spenen als toom bij elkaar zijn gehouden in een gangbaar hok met 10 biggen. Bij opleg in de vleesvarkensstal zijn alle biggen opgelegd in traditionele vleesvarkenshokken met 12 dieren per hok. De bevindingen van het onderzoek bij de zeugen, biggen en vleesvarkens zijn beschreven in dit rapport.
    Handboek opfokzeugen
    Peet-Schwering, C.M.C. van der; Hoofs, A.I.J. ; Soede, N.M. ; Opschoor, C.T. - \ 2014
    Wageningen : Wageningen UR Livestock Research (Report / Livestock Research 783) - 39
    zeugen - varkensfokkerij - varkenshouderij - handboeken - technische informatie - dierenwelzijn - diergezondheid - huisvesting, dieren - sows - pig breeding - pig farming - handbooks - technical information - animal welfare - animal health - animal housing
    Het handboek opfokzeugen bevat vaktechnische kennis die van belang is voor de varkenshouder op zijn bedrijf. De nadruk ligt op de praktische toepassing, hier en daar aangevuld met achtergrondinformatie. het handboek is bedoeld als naslagwerk en als bron van technische informatie.
    Sociable swine: prospects of indirect genetic effects for the improvement of productivity, welfare and quality
    Duijvesteijn, N. - \ 2014
    Wageningen University. Promotor(en): Johan van Arendonk, co-promotor(en): Piter Bijma; E.F. Knol. - Wageningen : Wageningen University - ISBN 9789462571525 - 202
    varkens - sociaal gedrag - groepsinteractie - genetische effecten - prestatieniveau - dierenwelzijn - androsteron - genomen - genetische correlatie - varkensfokkerij - stakeholders - beoordeling - dierlijke productie - pigs - social behaviour - group interaction - genetic effects - performance - animal welfare - androsterone - genomes - genetic correlation - pig breeding - stakeholders - assessment - animal production

    Towards Healthy Diets for parents: efectiveness of a counselling intervention

    Eveline J.C. Hooft van Huysduynen


    Introduction and Objective: As parents’ modelling of dietary behaviour is one of the factors influencing children’s diets, improving parents’ diets is expected to result in improved dietary intake of their children. This thesis describes research that was conducted to develop and evaluate a counselling intervention to improve parental adherence to the Dutch dietary guidelines.

    Methods: A counselling intervention was developed, which was underpinned with the theory of planned behaviour and the transtheoretical model. In 20 weeks, five face-to-face counselling sessions were provided by a registered dietician who used motivational interviewing to improve parental adherence to the Dutch dietary guidelines. In addition, parents received three individually tailored email messages. During the counselling, the dietary guidelines and additional eating behaviours, that were hypothesized to affect diet quality, were addressed. The intervention was evaluated in a randomised controlled trial with 92 parents receiving the counselling and 94 parents as controls. Effects on dietary intake, biomarkers, intermediate markers of health and children’s dietary intake were evaluated. With mediation analyses, it was investigated if changes in dietary intake were established via changes in behavioural determinants. Thereby, it was also examined if spot urine samples could be used to replace 24 h urine samples for evaluating changes in sodium and potassium intake.

    Results: The intervention group increased their adherence to the dietary guidelines, as assessed with the Dutch Healthy Diet-index (ranging from 0 to 100 points), by 6.7 points more than the control group did. This improvement was achieved by small increases in the scores of seven out of ten index components. The most substantial changes were shown in fruit and fish intakes of which increases in fish intake were reflected in changes in fatty acid profiles derived from blood plasma. Also a small decrease in waist circumference was observed. Based on parental reports, the children in the intervention group increased their intakes of fruit, vegetables and fish more than the children in the control group. Improvements in parental fruit intake were mediated by changes in the behavioural determinants attitude and habit strength. Decreases in snack intake were mediated by changes in self-identity as a healthy eater. Although the results of a study in young Caucasian women showed that spot urine can be used to rank individuals for their ratios of sodium to potassium, no intervention effects on these ratios were observed.

    Conclusion: This thesis provides empirical knowledge on potential effective elements for counselling interventions aiming at improving the dietary pattern as a whole of parents and provides knowledge on methods to evaluate changes in dietary intake.

    Het Nederlands Groot-Yorkshire varken
    Slaghuis, H. ; Oldenbroek, J.K. - \ 2014
    Zeldzaam huisdier 39 (2014)2. - ISSN 0929-905X - p. 20 - 21.
    varkensfokkerij - varkensrassen - zeldzame rassen - veredelingsprogramma's - fokwaarde - rassen (dieren) - pig breeding - pig breeds - rare breeds - breeding programmes - breeding value - breeds
    De Bonte Bentheimer en het Nederlands landvarken hebben al de volle aandacht van de SZH. Maar verdient het Groot-Yorkshirevarken die aandacht ook niet? In de Nederlandse varkensfokkerij is dit ras indertijd gefokt voor de productie van slagersvarkens. In dit artikel wordt de geschiedenis van het Nederlands Groot-Yorkshirevarken op een rij gezet en aangegeven hoe het er nu voorstaat.
    Fokkerij geeft antwoord op vragen maatschappij
    Greef, K.H. de; Hiemstra, S.J. ; Kool, E. - \ 2014
    V-focus 2014 (2014)1. - ISSN 1574-1575 - p. 28 - 29.
    varkenshouderij - dierenwelzijn - varkens - dierveredeling - staartbijten - varkensfokkerij - diergenetica - genotypische variatie - duurzame veehouderij - pig farming - animal welfare - pigs - animal breeding - tail biting - pig breeding - animal genetics - genetic variance - sustainable animal husbandry
    De fokkerij kan een belangrijke bijdrage leveren aan het oplossen van een probleem als berengeur en het begrijpen van staartbijten. Naast deze twee maatschappelijke vraagstukken zijn er veel meer vragen waarop het samenwerkingsverband Breed4Food antwoord wil geven. Dit artikel beschrijft doorbraken, die Breed- 4Food wil realiseren in de varkensfokkerij om daarmee bij te dragen aan een economisch en maatschappelijk duurzame houderij.
    Snow shoes and sandals? : genetic aspects of heat stress sensitivity and sow reproduction
    Bloemhof, S. - \ 2013
    Wageningen University. Promotor(en): Johan van Arendonk; I. Misztal, co-promotor(en): E.F. Knol; Liesbeth van der Waaij. - S.l. : s.n. - ISBN 9789461735881 - 173
    zeugen - warmtestress - diergenetica - gevoeligheid - geslachtelijke voortplanting - voortplantingsvermogen - kritische temperatuur - hittetolerantie - selectief fokken - genetische correlatie - veredelingsprogramma's - varkensfokkerij - sows - heat stress - animal genetics - sensitivity - sexual reproduction - reproductive performance - critical temperature - heat tolerance - selective breeding - genetic correlation - breeding programmes - pig breeding

    Globally the average size of pig herds are increasing and amount of labour spent per sow / finisher pig is decreasing. These changes require sows which need less management interventions. In addition to easier manageable sows modern genotypes will also need to be more adaptable considering that global temperatures are expected to increase and pork production is partially moving to warmer climates. The end result is that commercial pigs nowadays will potentially face more heat stress challenges during their productive lives.

    In this thesis, a model was developed which was used to estimate upper critical temperatures for sows’ reproductive performance. Additionally the possibility to breed for reduced heat tolerance of sows was investigated. Therefore heritability for the random regression slope of farrowing rate against increasing temperature at day of insemination (= heat tolerance) and the genetic correlation between farrowing rate and heat tolerance was estimated.Commercial production pigs are crossbreds farmed all over the world. In contrast, selection is practiced mainly in temperate climates, in nucleus herds using purebred pigs. The success of genetic selection depends on how much genetic progress is realized in crossbred pigs. Within this thesis these genetic correlations for farrowing rate between purebreds and crossbreds were estimated.

    Sow productivity depends on a number of related traits, such as ovulation rate, the number of litters per sow per year, the number of weaned piglets per sow per year, and the length of productive live. Traditionally pig breeding programs have improved sow productivity by increasing number weaned piglets per sow per year. To improve herd-level litters per sow per year a new trait was proposed called problem free sow production by parity, which incorporates the traits interval weaning first insemination, non-return rate, farrowing rate, and selection for next parity. Heritability of problem free sow production and genetic correlations with other sow production traits were estimated.

    The main conclusion of this thesis was that it is possible to select for improved heat resistance in addition to improved commercial production levels in commercial pigs. However, genetic correlation between production in temperate and hot climates is high. This high correlation implies that, within-line, pigs with the best performance in a hot climate will be the best in temperate climate too. Most important for the success of a pig breeding program is to define appropriate breeding goals which are based on the environment(s) that market pigs are expected to perform in. The overall data collection for the genetic evaluation needs to be done in those specific environments and this will favour pigs which are able to produce over more than one specific environment.

    Use of genetic markers in pig breeding programs
    Coster, A. - \ 2013
    Wageningen University. Promotor(en): Johan van Arendonk, co-promotor(en): Henk Bovenhuis; Henri Heuven. - S.l. : s.n. - ISBN 9789461734426 - 152
    varkens - dierveredeling - varkensfokkerij - genetische merkers - marker assisted breeding - stamboom - genomica - loci voor kwantitatief kenmerk - worpgrootte - pigs - animal breeding - pig breeding - genetic markers - marker assisted breeding - pedigree - genomics - quantitative trait loci - litter size

    The objective of this thesis was to investigate the use of genetic markers in commercial pig breeding, with a special emphasis on genomically imprinted genes. For the latter purpose, an association study was undertaken to identify genomically imprinted QTL related to sow fertility traits in two commercial pig populations. Furthermore, several simulation studies were performed to evaluate methods to estimate breeding values with marker data. Finally, a new method was designed to estimate the parental origin of marker alleles in crossed populations when the pedigree is unknown.

    The association study involved approximately sows from two commercial pig populations. The sows were genotyped for SNP markers, of which were finally used. The results revealed one SNP with a significant imprinting effect on the trait litter size in one population. The imprinting effect of this SNP was not significant in the other population but its effect was similar. The SNP was located close to the gene DIO3, which has a known imprinting status. Furthermore, several SNP with significant additive and dominance effects were found in both populations.

    The simulation studies were designed to evaluate the effect of the number of genes and the relative importance of these genes on the trait on performance of distinct methods to estimate breeding values with markers. Results of the first study showed that the performance of these methods is affected by gene number and size. Results of the second study continued on these results and showed that genetic gain achievable by selecting on breeding values estimated by these methods strongly depends on the number of genes and their relative size.

    Knowledge of parental origin of marker or gene alleles is of crucial importance to study genomically imprinted genes. A method based on the Dirichlet Process was designed to estimate the parental origin of SNP alleles in crossed populations. The method performed better than methods that did not account crossbreeding, and the performance of the method was strongly improved when some genotypes of some parental individuals were available in the data.

    The last chapter evaluated the influence of genomic imprinting on genetic parameters of genes. An important conclusion of this chapter is that genomically imprinted genes have less variance compared to similar, non-imprinted genes. This lower variance leads to lower power of statistical methods to detect these genes and lower genetic gain achievable in breeding programs. On the other hand, however, genomically imprinted genes could be effectively used in crossbreeding programs.

    Geschikt fokprogramma voor biologische varkens
    Napel, J. ten - \ 2011
    In: BioKennis innovatie magazine / Wijnands, F.G., van Keulen, H., Dubbeldam, R., - p. 48 - 49.
    varkens - varkensfokkerij - varkenshouderij - biologische landbouw - veredelingsprogramma's - pigs - pig breeding - pig farming - organic farming - breeding programmes
    Biologische varkenshouders kiezen bij het fokken van hun varkens voor een biologisch fokprogramma met rotatiekruising. Dit komt zowel de gezondheid van de dieren als de afzet van biologisch varkensvlees ten goede. Jaarlijks vervangen de varkenshouders gemiddeld 40 procent van hun vermeerderingszeugen
    Inkomens zeugenhouderij in 2011 fors lager, vleesvarkensbedrijven wel in de plus
    Wisman, J.H. - \ 2011
    Agri-monitor 2011 (2011)12. - ISSN 1383-6455
    varkenshouderij - varkensfokkerij - landbouwprijzen - inkomen van landbouwers - bedrijfsresultaten in de landbouw - prijsvorming - pig farming - pig breeding - agricultural prices - farmers' income - farm results - price formation
    De varkenshouderij had in 2011 te maken met hogere voerprijzen, lagere biggenprijzen en iets hogere vleesvarkensprijzen dan in 2010. Voor de fokvarkensbedrijven leidde die combinatie tot een daling van het inkomen, voor vleesvarkenshouderij tot een stijging.
    Breeding against osteochondrosis : phenotypic and genetic analyses in horses and pigs
    Grevenhof, E.M. van - \ 2011
    Wageningen University. Promotor(en): Johan van Arendonk; P.R. van Weeren, co-promotor(en): Piter Bijma. - [S.l.] : S.n. - ISBN 9789085858546 - 182
    horses - pigs - osteochondritis - pig breeding - horse breeding - genetic parameters - genetic analysis - joints (animal) - skeletal development - animal breeding - paarden - varkens - osteochondritis - varkensfokkerij - paardenfokkerij - genetische parameters - genetische analyse - gewrichten (dieren) - skeletontwikkeling - dierveredeling

    Osteochondrosis (OC) is a disturbance in the process of endochondral ossification during skeletal growth. The objectives of this thesis were to assess the prevalence and genetic parameters of OC, and to facilitate optimization of breeding against OC in horses and pigs.

    In the Dutch warm blood horse, 70% of individuals showed joint abnormalities in at least one of the 28 locations examined. Joint abnormalities were divided into flattened bone contours and bone fragments. Genetic parameters were estimated for flattened bone contours, fragments and overall OC. Heritability was 0.08 for flattened bone contours, 0.22 for fragments, and 0.23 for overall OC.

    In fattening pigs, the prevalence of OC was 41%, and 12% of the individuals had severe OC. The prevalence was highest for individuals kept on a concrete, partially slatted floor with ad libitum feeding (58%), and lowest for individuals kept on a deep litter floor with restricted feeding (34%). These results demonstrate that the prevalence of OC can be reduced by applying deep litter floors and restricted feeding. The differences in growth patterns between pigs with and without OC were investigated also. After 28 days of age, piglets with severe OC at slaughter started to grow faster, and were significantly heavier after 70 days of age than pigs without OC at slaughter. These results suggest that OC might be related to high growth rates during a specific time period.

    To evaluate prospects for breeding against OC, selection responses were compared between breeding schemes using phenotypic selection based on own performance or progeny testing and genomic selection. The results show that, when genomic information has an equal accuracy as phenotypic information before selection, it will have a lower equilibrium response to selection because it has a larger Bulmer effect. Especially for low heritable traits, genomic selection was of additional value over traditional selection.

    The general discussion argues that OC has both economical and practical relevance for the current horse industry. Simulations showed potential for genomic selection compared to the current breeding program in the Dutch warmblood horse (KWPN), even with small reference populations. In pigs, OC is a more serious problem in sows than in fattening pigs, because sows live longer. A decrease in OC prevalence will, therefore, yield larger economic and welfare benefits then apparent from results on fattening pigs. Also for pigs, simulations indicated possibilities for genomic selection. The final section of the general discussion proposes directions for future research.

    De voorziening van biologische opfokzeugen = The supply of organic gilts
    Napel, J. ten; Leenhouwers, J. ; Merks, J. - \ 2009
    Wageningen : Livestock Research (Rapport / Livestock Research 252) - 19
    biologische landbouw - varkenshouderij - gelten - dierveredeling - biologische productie - certificering - varkensfokkerij - organic farming - pig farming - gilts - animal breeding - biological production - certification - pig breeding
    De biologische varkenshouders in Nederland maken voor de vervanging van hun zeugen gebruik van fokmateriaal uit de gangbare varkenshouderij. Dit via aankoop van fokgelten of via aankoop van sperma van gangbare zeugenlijnen voor de eigen aanfok van fokgelten. Echter, biologische bedrijven die alle fokgelten voor vervanging aankopen van niet-biologische bedrijven voldoen niet aan de SKAL richtlijn. Het doel van deze studie is om rassen, kruisingen en fokkerijstructuren te vergelijken om de meest geschikte werkwijze te vinden waarmee de biologische varkenshouderij zichzelf kan voorzien van fokgelten.
    Tweede kwartaal 2009 zeugenhouderij: saldo verdubbeld vergeleken met 2008
    Bolhuis, J. ; Wisman, J.H. - \ 2009
    Agri-monitor 2009 (2009)sept. - ISSN 1383-6455 - p. 1 - 2.
    varkenshouderij - zeugen - biggenproductie - landbouwprijzen - marktonderzoek - bedrijfsresultaten in de landbouw - varkensfokkerij - pig farming - sows - piglet production - agricultural prices - market research - farm results - pig breeding
    De biggenprijs daalt in het 2e kwartaal van 2009 licht, maar het prijsniveau blijft ruim boven dat van 2008. De export van biggen is sterk toegenomen, vooral richting Oost-Europa. Dankzij het hoge prijsniveau is het saldo in de zeugenhouderij t.o.v. 2e kwartaal van 2008 meer dan verdubbeld
    Zelf aanfokken of gezamelijk
    Lamers, J. - \ 2008
    Ekoland 28 (2008)11. - ISSN 0926-9142 - p. 14 - 15.
    biologische landbouw - varkenshouderij - zeugen - varkensfokkerij - organic farming - pig farming - sows - pig breeding
    Voor de vervanging van hun oude zeugen gebruikten biologische varkenshouders tot nu toe vooral jonge zeugen uit de reguliere houderij. Dit is niet meer toegestaan en daarom staan biologische zeugenhouders voor de keuze: zorg ik alleen voor de vervanging, of gaan we als sector samenwerken en maken we een eigen biologische zeugenlijn.
    Vervanging zeugenstapel vraagt om keuzes
    Lamers, J. ; Napel, J. ten - \ 2008
    Wageningen : Wageningen UR (BioKennis bericht : Varkensvlees ) - 4
    biologische landbouw - varkens - biologische productie - varkensfokkerij - organic farming - pigs - biological production - pig breeding
    De vervanging van de biologische zeugenstapel vanuit de reguliere houderij staat onder druk. Biologische zeugenhouders zullen daarom een keuze moeten maken: kiezen ze ieder voor zich voor een rotatiekruising of meerwegkruising? Of kiest men samen voor een biologisch fokbedrijf of eigen aanfok met een biologische zeugenlijn? Om te komen tot zeugen met specifieke eigenschappen die passen bij de biologische houderij, is de inzet van alle zeugenhouders gewenst.
    Naar smakelijk spek zonder castratie
    Wiel, D.F.M. van de - \ 2008
    berengeur - varkensvlees - dierenwelzijn - varkenshouderij - dierveredeling - smaak - genen - eiwitexpressieanalyse - varkensfokkerij - boar taint - pigmeat - animal welfare - pig farming - animal breeding - taste - genes - proteomics - pig breeding
    Met dit project wordt beoogd om met behulp van moderne genetische technieken een effectieve en betaalbare, maar ook diervriendelijke methode mogelijk te maken om berengeur te voorkomen en op te sporen in levende dieren
    Paradigms in pig science
    Wiseman, J. ; Varley, M.A. ; McOrist, S. ; Kemp, B. - \ 2007
    Nottingham : Nottingham University Press (Proceedings of Easter Schools in Agricultural Science ) - ISBN 9781904761563 - 538
    varkens - varkenshouderij - dierlijke productie - dierhouderij - varkensvoeding - diervoeding - dierveredeling - dierfysiologie - diergezondheid - varkensvlees - varkensfokkerij - pigs - pig farming - animal production - animal husbandry - pig feeding - animal nutrition - animal breeding - animal physiology - animal health - pigmeat - pig breeding
    Verkenning van economische en foktechnische consequenties van georganiseerde fokkerij voor de biologische varkenshouderij
    Hoste, R. ; Ducro-Steverink, D.W.B. ; Bosma, A.J.J. - \ 2007
    Den Haag : LEI (Rapport / LEI : Domein 2, Bedrijfsontwikkeling en concurrentiepositie ) - ISBN 9789086151462 - 31
    varkenshouderij - dierveredeling - zeugen - productiekosten - rassen (dieren) - biologische landbouw - agrarische economie - varkensfokkerij - pig farming - animal breeding - sows - production costs - breeds - organic farming - agricultural economics - pig breeding
    An explorative study has been carried out to review the breeding and economic related consequences of sow replacement systems for the organic pig farming sector. In the longer term, the use of maiden gilts from the conventional pig breeding is not expected to be tenable, and for this reason 'organic' breeding is required. The cost of maiden 'organic' gilts is calculated as approximately €410. Consequently, the cost increase compared to supply of 'conventional' gilts amounts to €7 per piglet and 12 cents per kg slaughter weight. Further studies in breeds appropriate for organic farming, structure of the breeding operations, collaboration, and the adoption of an international approach are required.
    Varkenshouderij moet fokken op 'gezond vlees'
    Arendonk, J.A.M. van - \ 2005
    Nieuwe Oogst / Magazine Veehouderij 1 (2005)4. - ISSN 1871-0948 - p. 3 - 3.
    varkenshouderij - dierveredeling - fokwaarde - verbetering van de veestapel - diergezondheid - vleeskwaliteit - genen - varkensfokkerij - pig farming - animal breeding - breeding value - herd improvement - animal health - meat quality - genes - pig breeding
    De varkenshouderij moet de gezondheid van het vlees in haar veeverbetering betrekken. Dat zei Johan van Arendonk, hoogleraar fokkerij en genetica in Wageningen op de ledenvergadering van fokkerijorganisatie Pigture Group. Hij ziet de weg daarnaartoe niet in de traditionele fokkerij. Hij ziet snellere methoden om op varkens te selecteren
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