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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    Plant secondary compounds and antinutritional factors
    Nyachoti, C.M. ; Agyekum, A.K. ; Lange, C.F.M. de; Poel, A.F.B. van der; Verstegen, M.W.A. - \ 2018
    In: Feed evaluation science / Moughan, Paul J., Hendriks, Wouter H., Wageningen : Wageningen Academic Publishers - ISBN 9789086863099 - p. 145 - 172.
    Results of an international phosphorus digestibility ring test with broiler chickens
    Rodehutscord, M. ; Adeola, O. ; Angel, R. ; Bikker, P. ; Delezie, E. ; Dozier, W.A. ; Umar Faruk, M. ; Francesch, M. ; Kwakernaak, C. ; Narcy, A. ; Nyachoti, C.M. ; Olukosi, Oluyinka A. ; Preynat, A. ; Renouf, B. ; Saiz Del Barrio, A. ; Schedle, K. ; Siegert, W. ; Steenfeldt, S. ; Krimpen, M.M. Van; Waititu, S.M. ; Witzig, Maren - \ 2017
    Poultry Science 96 (2017)6. - ISSN 0032-5791 - p. 1679 - 1687.
    The objective of this ring test was to investigate the prececal phosphorus (P) digestibility of soybean meal (SBM) in broiler chickens using the trial protocol proposed by the World's Poultry Science Association. It was hypothesized that prececal P digestibility of SBM determined in the collaborating stations is similar. Three diets with different inclusion levels of SBM were mixed in a feed mill specialized in experimental diets and transported to 17 collaborating stations. Broiler chicks were raised on commercial starter diets according to station-specific management routine. Then they were fed the experimental diets for a minimum of 5 d before content of the posterior half of the ileum was collected. A minimum of 6 experimental replicates per diet was used in each station. All diets and digesta samples were analyzed in the same laboratory. Diet, station, and their interaction significantly affected (P < 0.05) the prececal digestibility values of P and calcium of the diets. The prececal P digestibility of SBM was determined by linear regression and varied among stations from 19 to 51%, with significant differences among stations. In a subset of 4 stations, the prececal disappearance of myo-inositol 1,2,3,4,5,6-hexakis (dihydrogen phosphate)-P; InsP6-P) also was studied. The prececal InsP6-P disappearance correlated well with the prececal P digestibility. We hypothesized that factors influencing InsP6 hydrolysis were main contributors to the variation in prececal P digestibility among stations. These factors were probably related to the feeding and housing conditions (floor pens or cages) of the birds in the pre-experimental phase. Therefore, we suggest that the World's Poultry Science Association protocol for the determination of digestible P be should extended to the standardization of the pre-experimental period. We also suggest that comparisons of P digestibility measurements among studies are made only with great caution until the protocol is more refined.
    Dose response of a new phytse on dry matter, calcium, and phosphorus digestibility in weaned piglets
    Bento, M.H.L. ; Pedersen, C. ; Plumstead, P.W. ; Salmon, L. ; Nyachoti, C.M. ; Bikker, P. - \ 2012
    Journal of Animal Science 90 (2012)S4. - ISSN 0021-8812 - p. 245 - 247.
    microbial phytase - pigs
    The present study evaluated the dose response of Buttiauxella phytase on apparent total tract digestibility (ATTD) of DM, Ca, and P in weaned pigs at 2 locations. Experimental diets fed to weaned pigs were a positive control (PC), a negative control (NC), and NC supplemented with increasing levels of Buttiauxella phytase. In Trial A, ATTD of P was 57.2% for PC, 32.5% for NC, and 59.4, 62.0, 63.8, 66.0, and 67.3% for 250, 500, 750, 1000, and 2000 phytase units (FTU) added to NC, respectively. In Trial B, ATTD of P was 45.2% for PC, 28.4% for NC, and 58.7, 64.1, 67.9, and 70.9% for 250, 500, 1000, and 2000 FTU added to NC, respectively. In both studies, the reduction in P in the NC diets reduced (P <0.01) ATTD of P when compared with the PC diets. Phytase supplementation linearly and quadratically increased (P <0.01) ATTD of P at all inclusion levels to the NC diet. In conclusion, the average digestible P increase from Buttiauxella phytase (vs. the NC diet) was 1.3, 1.5, 1.6, and 1.7 g digestible P/kg feed for 250, 500, 1000, and 2000 FTU/ kg, respectively.
    Modeling the efficiency of phosphorus utilization in growing pigs
    Kebreab, E. ; Strathe, A.B. ; Yitbarek, A. ; Nyachoti, C.M. ; Dijkstra, J. ; Lopez, S. ; France, J. - \ 2011
    Journal of Animal Science 89 (2011)9. - ISSN 0021-8812 - p. 2774 - 2781.
    soybean meal diets - growth - phytase - nutrition - efficacy
    Microbial phytase has been used to reduce P excretion from swine to mitigate environmental pollution. The objective of the study was to quantify the effect of feeding a low-P phytase-supplemented diet on growth and P utilization in growing pigs using mathematical models. A total of 20 weaned piglets (BW = 6.5 kg) housed in metabolism cages were randomly assigned to a standard diet (STD) or P-amended diet containing reduced P content and supplemented with phytase (AMN) with 10 pigs/diet. Body weight and feed consumption were recorded weekly so complete growth and cumulative P intake (cPI) curves could be modeled. A function with fixed point of inflexion (Gompertz) and a variable point of inflexion (generalized Michaelis-Menten) were considered in determining bioequivalence by analyzing BW vs. age relationships, whereas the monomolecular function was used to describe BW vs. cPI. All functions were incorporated into a nonlinear mixed effects model, and a first-order autoregressive correlation structure was implemented to take into account repeated measures. There was no difference between the 2 groups in final BW when the Gompertz equation was fitted (176 vs. 178 kg with SE of 7 kg for the STD and AMN, respectively) or the rate parameter (0.0140 vs. 0.0139 with SE of 0.0004 for the STD and AMN, respectively). The generalized Michaelis-Menten equation also showed a similar trend. When BW was expressed as a function of cPI the derivative with respect to cPI represented P efficiency, so it was possible to analyze the expected difference of the 2 diets in using P for BW gain and express it as a continuous function of cPI. The analysis showed through the entire growth period the difference in P efficiency was different from zero. On average, 56 g of supplemented inorganic P was consumed by a pig fed the AMN to reach market weight. In contrast, 309 g of supplemented inorganic P was consumed by the group fed the STD to reach similar BW. It would depend on other factors, but feeding pigs the AMN can result in economic benefit. Pigs fed the AMN excreted 19% less P compared with those fed the STD. In conclusion, nonlinear mixed model analysis (with repeated measures) was suitable for growth and efficiency analysis and showed that pigs fed the AMN consumed less than 20% of the inorganic P and performed as well as those fed the traditional inorganic P supplemented diet. The implications for mitigating P pollution, especially in areas where P loading is already problematic, are substantial.
    Modelling the profile of growth in monogastric animals
    Kebreab, E. ; Strathe, A.B. ; Nyachoti, C.M. ; Dijkstra, J. ; Lopez, S. ; France, J. - \ 2010
    In: Modelling Nutrient Digestion and Utilisation in Farm Animals / Sauvant, D., van Milgen, J., Faverdin, P., Friggens, N., Wageningen : Wageningen Academic Publishers - ISBN 9789086861569 - p. 386 - 393.
    The significance of antinutritional factors in feedstuffs for monogastric animals
    Lange, C.E.M. de; Nyachoti, C.M. ; Verstegen, M.W.A. - \ 2000
    In: Feed evaluation, principles and practice / Moughan, P.J., Verstegen, M.W.A., Visser-Reynevel, M.I., Wageningen : Wageningen Pers - p. 169 - 188.
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