Practical validation of efficacy of the standardized ileal digestible amino acid values in diet formulation for broiler chickens
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National Research Institute of Animal Production, Department of Animal Nutrition and Feed Science, 32-083 Balice, Poland
Publication date: 2010-11-26
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W. Szczurek   

National Research Institute of Animal Production, Department of Animal Nutrition and Feed Science, 32-083 Balice, Poland
J. Anim. Feed Sci. 2010;19(4):590-598
The aim of experiment was to determine the potential for the improvements in growth performance and carcass traits, and reduction of N excreta output in final rearing period of broiler chickens by formulating diets on standardized ileal digestible amino acid (SID AA) basis. The experimental diets were composed of wheat, faba beans, peas, maize DDGS, soyabean meal and one of the 3 rapeseed products: solvent-extracted meal (RSM), expeller-extracted cake (RSC) or full-fat seeds (FRS); control diet was based on maize and soyabean meal. Experimental diets were formulated in two versions, based on a total (T) or digestible (D) levels of Lys, Met, Cys, Thr and Trp in feed components: calculated with the use of the SID AA coefficients determined previously with 30-day-old birds. The control diet was formulated on total AA at the levels equivalent to the levels in the T subset of experimental diets. Irrespective of the rapeseed component type, formulating diets on a SID AA basis yielded improved performance and post-slaughter parameters, and reduced excreta N output compared with their total AA counterparts. These benefits were most pronounced in chickens fed on diet containing RSM. Feeding the T version of experimental diets had a significant adverse impact on chicken growth and slaughter performances, and resulted in higher N outputs compared with the control group. Formulating experimental diets with SID AA (D version) allowed to obtain mean values of feed conversion ratio and performance indexes, carcass and breast meat yields, and both absolute and relative N excretions not significantly different from the control group. Relative to the control diet, balancing digestible AA contents partially compensated the negative effects of total AA formulation on body weight gains during the experiment.
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