Rafuse, J. L., Silversides, F. G., Bedford, M. R. and Simmins, P. H. 2004. Effect of wheat cultivar and enzyme supplementation on nutrient availability and performance of laying hens. Can. J. Anim. Sci. 84: 397-402. This study examined the effect of four wheat cultivars (Belvedere, Glenlea, Norboro, and Walton) grown in the Maritime provinces of Canada and dietary enzyme supplementation on apparent metabolizable energy (AME), digestibility of crude protein (CP), and performance of laying hens, and compared these values to those obtained using a corn-based diet. Forty groups of three adjacent battery cages, each housing two hens, were fed each diet which included the wheat samples (61.0%) or locally obtained corn (65.1%), with or without commercial enzymes containing a mixture of xylanase, protease, and amylase for corn-based diets and a mixture of xylanase and protease for wheat-based diets. Excreta samples were collected at 17 d for analysis of nutrient retention. The diet that the hens consumed had no significant effect on performance. The feed conversion ratio of hens was lowest (1.79) in the final week of the experiment when egg production was highest (97.0%) and feed intake lowest (109 g bird -1 d -1 ). The diet significantly affected both AME and digestibility of CP. The wheat cultivar influenced the AME and digestibility of CP when these diets were fed to laying hens, with enzyme supplementation reducing the AME and digestibility of CP for diets containing three (Belvedere, Glenlea, and Walton) of the four wheat cultivars. The significant improvement with enzyme supplementation of the corn-based diet is promising and should be the basis of future studies. Pour cela, ils ont nourri des poules logées deux par deux dans quatre groupes de trois cages adjacentes avec chaque ration, à savoir celle incluant les échantillons de blé (61,0 %) et celle faite de maïs cultivé localement (65,1 %) avec ou sans prépara-tion commerciale d'enzymes (xylanase et protéase dans le premier cas; xylanase, protéase et amylase dans le second). Le 17 e jour, ils ont prélevé des échantillons d'excréments en vue de préciser la quantité d'éléments nutritifs assimilée. La ration que consomment les pondeuses n'a aucune incidence sur le rendement de ces dernières. Le ratio de valorisation des aliments a atteint sa valeur la plus faible (1,79) la dernière semaine de l'expérience, quand la ponte était à son maximum (97,0 %) et l'ingestion des aliments à son point le plus bas (109 g par volatile et par jour). La ration a une incidence significative sur l'EMA et la digestibilité des PB. Le cultivar influe aussi sur ces deux facteurs chez les poules nourries avec du blé, mais le supplément enzymatique réduit la valeur des deux paramètres pour les rations contenant trois des quatre cultivars (Belvedere, Glenlea et Walton). L'importante amélioration que le supplément enzymatique permet d'obtenir avec la ration à base de maïs s'avère prometteuse et mériterait des études plus poussées. Mots clés: Blé, pondeuses, EMA, enzymesThe apparent metaboliz...
Rafuse, J. L., Silversides, F. G., Bedford, M. R. and Simmins, P. H. 2005. Effect of cultivar and enzyme supplementation on nutrient availability and performance of broilers fed Maritime Canadian wheat. Can. J. Anim. Sci. 85: 493-499. The feeding value of wheat is affected by the content of soluble non-starch polysaccharides (NSP), which varies among cultivars and the environment in which they are grown. Dietary enzymes can reduce the negative effects of NSP and improve the apparent metabolizable energy (AME) content of the wheat. This study examined differences in feeding value of four wheat cultivars grown in 2 crop years in the Maritime provinces of Canada and the need for enzymes. In a growth trial, diets containing one of the Maritime wheats or corn were fed with or without commercial enzymes containing, for wheat-based diets a mixture of xylanase and protease, and for corn-based diets a mixture of xylanase, protease, and amylase. In a broiler chick bioassay, diets containing 80% wheat were fed with or without a commercial enzyme with xylanase and protease activities. Enzymes significantly lowered body weight gain of birds fed Walton wheat in the second year, and improved the grower feed conversion ratio of birds fed Norboro wheat. Enzyme supplementation significantly improved apparent metabolizable energy and digestibility of crude protein. The AME content did not appear to be a direct indicator of performance. There were significant differences in AME content among the wheat samples. Enzymes generally did not improve performance in this study, possibly due to the relatively low in vitro viscosity values of these samples. Maritime wheats were equal or compared favourably with the sample of wheat from Western Canada and to locally obtained corn. Mots clés: Blé, rendement des poulets de chair, énergie métabolisable apparente, enzymeThe feeding value of wheat is adversely influenced by the presence of anti-nutritional factors in the form of soluble non-starch polysaccharides (NSP). In the gastrointestinal tract of broilers, a portion of the NSP becomes soluble and results in sticky droppings, reduced uptake of nutrients, and decreased weight gain.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.