Effect of age on the standardized ileal amino acid digestibility of soybean meal and canola meal in broilers.

Autor:	Barua M; Monogastric Research Center, School of Agriculture and Environment, Massey University, Palmerston North 4442, New Zealand.; Department of Animal Science and Nutrition, Faculty of Veterinary Medicine, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram 4225, Bangladesh., Abdollahi MR; Monogastric Research Center, School of Agriculture and Environment, Massey University, Palmerston North 4442, New Zealand., Zaefarian F; Monogastric Research Center, School of Agriculture and Environment, Massey University, Palmerston North 4442, New Zealand., Wester TJ; Monogastric Research Center, School of Agriculture and Environment, Massey University, Palmerston North 4442, New Zealand., Girish CK; Nutrition and Care, Animal Nutrition, Evonik (SEA) Pte. Ltd, 609927 Singapore., Chrystal PV; Complete Feed Solutions, Howick 2145, Auckland, New Zealand., Ravindran V; Monogastric Research Center, School of Agriculture and Environment, Massey University, Palmerston North 4442, New Zealand.
Jazyk:	angličtina
Zdroj:	Animal nutrition (Zhongguo xu mu shou yi xue hui) [Anim Nutr] 2023 Oct 12; Vol. 16, pp. 11-22. Date of Electronic Publication: 2023 Oct 12 (Print Publication: 2024).
DOI:	10.1016/j.aninu.2023.09.004
Abstrakt:	Standardized ileal digestibility coefficients (SIDC) of nitrogen (N) and amino acids (AA) in two protein sources (soybean meal [SBM] and canola meal [CM]) were investigated at six broiler ages (d 7, 14, 21, 28, 35, and 42). Two assay diets were formulated to contain either SBM (413 g/kg) or CM (553 g/kg) as the sole dietary AA source. Titanium dioxide (5 g/kg) was added as an indigestible marker. A total of 696 male broilers at 1 d old were allotted to 12 replicate cages per age group. Each assay diet was offered to birds for 4 d prior to the ileal digesta collection on d 7 (14 birds/cage), 14 (12 birds/cage), 21 (10 birds/cage), 28 (8 birds/cage), 35 (8 birds/cage) and 42 (6 birds/cage), respectively. The apparent digestibility coefficients were standardized using age-specific basal endogenous AA flows. In the SBM group, though the SIDC of N tended to be influenced (quadratic; P  = 0.075) by age, no linear or quadratic response of age effect was observed on the average SIDC of indispensable (IAA) and total AA (TAA). An age effect (quadratic; P  < 0.05) was observed on the average SIDC of dispensable AA (DAA) in SBM with the highest value recorded at d 7, followed by a decrease from d 14 to 28, which increased beyond d 35. The SIDC of some individual AA (Arg, Thr, Trp, Cys, Pro) were affected ( P  < 0.05 or P  < 0.001) in a quadratic manner by age. In the CM, the SIDC of N, average SIDC of IAA, DAA and TAA were influenced (quadratic; P  < 0.05 or P  < 0.001) by age. The SIDC of N and average SIDC of DAA and TAA were higher from d 7 to 14, declined at d 21, and then increased beyond d 28. The average SIDC of IAA was low between d 7 and 28 and increased thereafter. The SIDC of individual AA were affected (linear or quadratic; P  < 0.05 or P  < 0.001) by different magnitudes by age. The age influence on the SIDC AA was variable, depending on the protein source and AA. The results demonstrate that age-specific SIDC AA data might need consideration in broiler feed formulations. Competing Interests: We declare that we have no financial and personal relationships with other people or organizations that can inappropriately influence our work, and there is no professional or other personal interest of any nature or kind in any product, service and/or company that could be construed as influencing the content of this paper. (© 2023 The Authors. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.)
Databáze:	MEDLINE
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