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Title: Total amino acid level affects the results of standardized ileal digestibility assays for feed ingredients for swine
Contributor(s): Bloxham, Darlene J (author); Azain, Michael (author); Pesti, Gene M  (author); Wu, Shu-Biao  (author)orcid 
Publication Date: 2023-06
Open Access: Yes
DOI: 10.1016/j.aninu.2022.08.018
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It has been demonstrated that the fiber content of oilseed meals and total amino acids (AA) in distillers' grains products affects standardized ileal digestibility (SID) values from swine assays and that total protein concentration affects the AA digestibility in assays using chickens. This analysis was conducted to test the hypothesis that the total AA content of test samples affects the SID assay results. Databases containing total AA profiles and SID values of 20 feedstuffs commonly fed to pigs from 2 sources, AMINODat 5.0 (Evonik Industries, 2015) and the Nutrient Requirements of Swine, 12th edition (NRC, 2012) were used to compare AA concentration effects on standardized ileal digestibility coefficients. Databases were compared with AA and SID available in both data sets. The total AA values were similar for the 2 databases with an R2 of 0.979 (P < 0.001). The linear relationship between digestibility coefficients from the 2 databases was highly significant, an R2 of 0.810 (P < 0.001). Both databases had increased SID values with increasing AA contents within and across feed ingredients. The SID = f(AA concentration) relationship was confirmed with an individual paper. Since SID, as typically measured, is a function of both digestion and absorption, both processes following MichaeliseMenten kinetics, SID = f(AA concentration) may simply be a natural phenomenon. Other reasons for the relationship were explored. Methods of estimating endogenous AA losses and misapplication statistical procedures may contribute to variation in results and at least partially explain why SID = f(AA concentration).

Publication Type: Journal Article
Source of Publication: Animal Nutrition, v.13, p. 19-30
Publisher: Zhongguo Xumu Shouyi Xuehui,Chinese Association of Animal Science and Veterinary Medicine
Place of Publication: China
ISSN: 2405-6383
Fields of Research (FoR) 2020: 3003 Animal production
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article
School of Environmental and Rural Science

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