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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    Nitrogen efficiency of dairy cattle : from protein evaluation to ammonia emission
    Duinkerken, G. van - \ 2011
    Wageningen University. Promotor(en): Wouter Hendriks, co-promotor(en): Jan Dijkstra. - [S.l.] : S.n. - ISBN 9789085859925 - 179
    melkvee - melkkoeien - stikstofverliezen - ammoniakemissie - diëten - voer - rundveevoeding - diervoeding - eiwitbalans - landbouw en milieu - dairy cattle - dairy cows - nitrogen losses - ammonia emission - diets - feeds - cattle feeding - animal nutrition - protein balance - agriculture and environment

    Diet optimization contributes considerably to increased nitrogen efficiency of dairy cattle, resulting in reduced nitrogen losses. This thesis focuses on three themes: the potential advances in protein evaluation systems for ruminants, the relationship between dairy cow diet and ammonia emission and the opportunities to monitor ammonia emission from dairy cow barns by application of milk urea content as a practical indicator. Overall, the present work shows that farm management can be aimed at increased nitrogen efficiency of dairy cattle and reduced ammonia emission without compromising other sustainability objectives such as the integral ecological footprint, animal health and farm profitability.

    Eiwitwaardering voor herkauwers; het DVE-OEB 2007 systeem
    Tamminga, S. ; Brandsma, G.G. ; Duinkerken, G. van; Vuuren, A.M. van; Blok, M.C. - \ 2007
    Wageningen : Wageningen University (CVB-documentatierapport nr. 52) - 62
    herkauwers - eiwitten - voederwaardering - eiwitverteerbaarheid - eiwitwaarde - eiwitbalans - pensvertering - herkauwersvoeding - diervoeding - ruminants - proteins - feed evaluation - protein digestibility - protein value - protein balance - rumen digestion - ruminant feeding - animal nutrition
    Protein evaluation for ruminants : the DVE/OEB 2007-system
    Tamminga, S. ; Brandsma, G.G. ; Duinkerken, G. van; Vuuren, A.M. van; Blok, M.C. - \ 2007
    Wageningen : Wageningen University (CVB-documentation report no. 53) - 58
    herkauwers - eiwitten - voederwaardering - eiwitverteerbaarheid - eiwitbalans - eiwitwaarde - pensvertering - herkauwersvoeding - diervoeding - ruminants - proteins - feed evaluation - protein digestibility - protein balance - protein value - rumen digestion - ruminant feeding - animal nutrition
    Modelling responses of broiler chickens to dietary balanced protein
    Eits, R.M. - \ 2004
    Wageningen University. Promotor(en): Martin Verstegen; Leonard den Hartog, co-promotor(en): Rene Kwakkel. - [S.I.] : S.n. - ISBN 9789085040705 - 163
    vleeskuikens - pluimvee - voedingseiwit - voedingsstoffen - eiwitbalans - groeitempo - voederconversie - karkasopbrengst - vleesopbrengst - vleeskuikenresultaten - groeimodellen - diervoeding - pluimveevoeding - voedingsfysiologie - broilers - poultry - dietary protein - nutrients - protein balance - growth rate - feed conversion - carcass yield - meat yield - broiler performance - growth models - animal nutrition - poultry feeding - nutrition physiology
    Protein is an important nutrient for growing broiler chickens, as it affects broiler performance, feed cost as well as nitrogen excretion. The objective of this dissertation was to develop a growth model for broiler chickens that could be easily used by practical nutritionists. The model should facilitate the selection of feeding strategies (in terms of dietary protein and energy)that resultsin the desired body composition of broilers while minimizing costs.

    Two important theories that are generally used in animal growth models were validated for broiler chickens. It was confirmed that, where protein is limiting, protein deposition rate will not increase with additional energy intake. The second theory, stating that the fat-free body composition is independent from nutrition, is not a valid assumption for broiler growth models.

    It was demonstrated that broiler responses to dietary balanced protein level (DBP) depend on previous protein nutrition. These results suggest that DBP levels in grower and finisher diets should not be optimised independently, but simultaneously.

    A model was developed that predicts broiler responses (growth rate, feed conversion ratio, carcass yield and breast meat yield) to DBP level. The model makes it possible to construct tailor-made dose-response curves without actual experimentation.

    Based on the predictions by this new model and data on feed and meat prices, the economic aspects of DBP level in broiler diets were evaluated. It was shown that formulating diets for maximum profit instead of maximum broiler performance may strongly increase profitability of a broiler production enterprise. Model simulations revealed as well that DBP level for maximum profitability depend on how the broilers are marketed; as whole birds, carcass or cut up.

    Sturing melkureumgehalte op dierniveau via de voeding
    Zom, R.L.G. ; Remmelink, G.J. ; Duinkerken, G. van - \ 2001
    Lelystad : Praktijkonderzoek Veehouderij (Rapport / Praktijkonderzoek Veehouderij 215) - 24
    melkvee - melksamenstelling - ureum - diervoeding - rundveevoeding - voer - samenstelling - voedingsrantsoenen - concentraten - eiwitbalans - eiwitten - dairy cattle - milk composition - urea - animal nutrition - cattle feeding - feeds - composition - feed rations - concentrates - protein balance - proteins
    Het Praktijkonderzoek Veehouderij voerde in de winterseizoenen van 1997-1998 en 1998-1999 een viertal voederproeven uit die antwoord moesten geven op de vraag of er variatie bestaat in het optimale melkureumgehalte tussen individuele dieren en in welke mate het melkureumgehalte van individuele dieren valt te sturen door middel van de voeding.
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