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Total amino acid level affects the results of standardized ileal digestibility assays for feed ingredients for swine
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Darlene J. Bloxhama, Michael Azainb, Gene M. Pestia, c, *, Shu-Biao Wuc
Animal Nutrition | 2023, 13(1) : 19 - 30
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Animal Nutrition | 2023, 13(1): 19-30
• Original Research Article •
Total amino acid level affects the results of standardized ileal digestibility assays for feed ingredients for swine
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Darlene J. Bloxhama, Michael Azainb, Gene M. Pestia, c, *, Shu-Biao Wuc
Affiliations
  • aDepartment of Poultry Science, The University of Georgia, Athens, GA 30602, USA
  • bDepartment of Animal and Dairy Sciences, The University of Georgia, Athens, GA 30602, USA
  • cThe University of New England, Armidale, NSW 2350, Australia
Published: 2023-06-10 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 Michaelis-Menten 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).

Apparent ileal digestibility  /  Standardized ileal digestibility  /  Swine  /  Least squares means
Darlene J. Bloxham, Michael Azain, Gene M. Pesti, Shu-Biao Wu. Total amino acid level affects the results of standardized ileal digestibility assays for feed ingredients for swine[J]. Animal Nutrition, 2023 , 13 (1) : 19 -30 . DOI: 10.1016/j.aninu.2022.08.018
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Article Info
doi: 10.1016/j.aninu.2022.08.018
  • Receive Date：2022-02-15
  • Online Date：2026-02-03
  • Published：2023-06-10
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History
  • Received：2022-02-15
  • Revised：2022-08-17
  • Accepted：2022-08-19
Affiliations
    aDepartment of Poultry Science, The University of Georgia, Athens, GA 30602, USA
    bDepartment of Animal and Dairy Sciences, The University of Georgia, Athens, GA 30602, USA
    cThe University of New England, Armidale, NSW 2350, Australia

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* Corresponding author. E-mail address: (G.M. Pesti).
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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