Comparative evaluation of methods for measuring standardized ileal digestibility of amino acids for different sorghum varieties in broilers.
4 affiliations
- 1School of Animal Science and Veterinary Medicine, Hainan University, Sanya, 572025, China.
- 2State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China.
- 3European Laboratory of Innovation Science and Expertise, Adisseo France S.A.S. Department of R&I in Monogastric Animal Nutrition, 20 rue Prosper Monnet, Saint Fons, 69190, France.
- 4State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China. Electronic address: [email protected].
Abstract
This study investigated the effects of two evaluation methods (direct vs. substitution) on standardized ileal amino acid digestibility (SIDAA) and intestinal digestive physiology in broilers fed sorghum from six regional sources. There were 336 27-d-old Cobb broilers assigned to 14 treatments, including a nitrogen-free diet (NFD), a corn-soybean meal (CSM) basal diet, and 12 experimental diets arranged in a 2 × 6 factorial arrangement. In the direct method, sorghum served as the only source of dietary amino acids whereas in substitution method the test sorghum replaced 40% (w/w) of the basal diet. The six sorghums were Yingkou (YK), Chifeng (CF), Yangzhou (YZ), Liaoning (LN), Zhangjiakou (ZJK) from China, and one from the United States (US). The digestibility trial was conducted from 27 to 29 d of age. The substitution method improved jejunal villus height and crypt depth, α-amylase and chymotrypsin activities, compared with the direct method (P < 0.05). YK sorghum with higher tannin contents reduced villus height, crypt depth, and chymotrypsin activity but increased ileal Occludin and ZO‑1 expression (P < 0.05). However, US, YZ, CF, and LN sorghum with lower tannin contents improved broiler digestive physiology. Broilers fed US exhibited the highest weight gain, and those fed LN showed the greatest villus height, crypt depth, and chymotrypsin activity (P < 0.05). Significant sorghum source × evaluation method interactions were observed for the AIDAA and SIDAA of all evaluated amino acids (P < 0.001), with more extensive method-related differences observed in YK and ZJK sorghum than in LN and US sorghum. Sorghum-based diets altered ileal microbiota, reducing Lactobacillus abundance and increasing Streptococcus, Corynebacterium, and Enterococcus (P < 0.05). The direct method increased (P < 0.05) the abundance of Turicibacter and Brachybacterium, whereas the substitution method produced a microbial composition similar to the basal diet. In conclusion, LN and US sorghum showed favorable AA digestibility, and the substitution method generally yielded higher AIDAA and SIDAA values and more favorable short-term responses in digestive enzyme activity and ileal microbial profiles than the direct method. The method-related differences in high-tannin sorghum highlight the importance of considering anti-nutritional factor content when selecting a method for evaluating AA digestibility.
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BibTeX
@article{zhou2026comparative,
title = {{Comparative evaluation of methods for measuring standardized ileal digestibility of amino acids for different sorghum varieties in broilers.}},
author = {Huajin Zhou and Guilan Xu and Tahir Mahmood and Yves Mercier and Jianmin Yuan},
journal = {Poultry science},
year = {2026},
month = oct,
doi = {10.1016/j.psj.2026.107879},
url = {https://europepmc.org/article/MED/42849232},
note = {CC BY-NC-ND},
}
RIS
TY - JOUR
TI - Comparative evaluation of methods for measuring standardized ileal digestibility of amino acids for different sorghum varieties in broilers.
AU - Huajin Zhou
AU - Guilan Xu
AU - Tahir Mahmood
AU - Yves Mercier
AU - Jianmin Yuan
PY - 2026
DA - 2026/10/04
JO - Poultry science
DO - 10.1016/j.psj.2026.107879
UR - https://europepmc.org/article/MED/42849232
AB - This study investigated the effects of two evaluation methods (direct vs. substitution) on standardized ileal amino acid digestibility (SIDAA) and intestinal digestive physiology in broilers fed sorghum from six regional sources. There were 336 27-d-old Cobb broilers assigned to 14 treatments, including a nitrogen-free diet (NFD), a corn-soybean meal (CSM) basal diet, and 12 experimental diets arranged in a 2 × 6 factorial arrangement. In the direct method, sorghum served as the only source of dietary amino acids whereas in substitution method the test sorghum replaced 40% (w/w) of the basal diet. The six sorghums were Yingkou (YK), Chifeng (CF), Yangzhou (YZ), Liaoning (LN), Zhangjiakou (ZJK) from China, and one from the United States (US). The digestibility trial was conducted from 27 to 29 d of age. The substitution method improved jejunal villus height and crypt depth, α-amylase and chymotrypsin activities, compared with the direct method (P < 0.05). YK sorghum with higher tannin contents reduced villus height, crypt depth, and chymotrypsin activity but increased ileal Occludin and ZO‑1 expression (P < 0.05). However, US, YZ, CF, and LN sorghum with lower tannin contents improved broiler digestive physiology. Broilers fed US exhibited the highest weight gain, and those fed LN showed the greatest villus height, crypt depth, and chymotrypsin activity (P < 0.05). Significant sorghum source × evaluation method interactions were observed for the AIDAA and SIDAA of all evaluated amino acids (P < 0.001), with more extensive method-related differences observed in YK and ZJK sorghum than in LN and US sorghum. Sorghum-based diets altered ileal microbiota, reducing Lactobacillus abundance and increasing Streptococcus, Corynebacterium, and Enterococcus (P < 0.05). The direct method increased (P < 0.05) the abundance of Turicibacter and Brachybacterium, whereas the substitution method produced a microbial composition similar to the basal diet. In conclusion, LN and US sorghum showed favorable AA digestibility, and the substitution method generally yielded higher AIDAA and SIDAA values and more favorable short-term responses in digestive enzyme activity and ileal microbial profiles than the direct method. The method-related differences in high-tannin sorghum highlight the importance of considering anti-nutritional factor content when selecting a method for evaluating AA digestibility.
SN - 0032-5791
SN - 1525-3171
ER -