Acta Veterinaria et Zootechnica Sinica ›› 2025, Vol. 56 ›› Issue (12): 6242-6256.doi: 10.11843/j.issn.0366-6964.2025.12.026

• ANIMAL NUTRITION AND FEEDS • Previous Articles     Next Articles

Construction of Prediction Model of Standardized Ileal Amino Acid Digestibility in Soybean Meal for Broilers

SUN Jiupeng, LIAO Xiudong, ZHANG Liyang, HUANG Liang, LI Xiaoran, LI Shunying, LIN Xuanxu, WANG Chong, LÜ Lin*   

  1. State Key Laboratory of Animal Nutrition and Feeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
  • Received:2024-11-21 Online:2025-12-23 Published:2025-12-24

Abstract: The objective of the present study was to determine the chemical compositions and standardized ileal amino acid digestibility (SIAAD) of 10 soybean meals from different sources for broilers at 13 d and 28 d of age, and establish the prediction equations. A completely randomized design was used in this study. A total of 990 1-d-old male Arbor Acres broilers in good health were randomly allotted to 1 of 11 treatment groups (1 nitrogen-free diet treatment group and 10 treatment groups for soybean meal). The experiment was divided into two experimental periods of 10-13 d and 25-28 d, in which there were 6 replicates of 10 chickens per treatment group during the 10-13 d, and 6 replicates of 5 chickens per treatment group during the 25-28 d. On 13 and 28 days of age, the ileal contents were collected to determine the SIAAD. The results showed that: The chemical compositions of soybean meal from different sources differed. There was significant interaction (P<0.05) between the source of soybean meal and broiler age on the SIAAD except for the standardized ileal digestibility (SID) of His in soybean meal. The differences in SIAAD among different sources of soybean meals were significant (P<0.05). Except for the SID Lys and SID Met, broiler age had an effect (P<0.05) on the SIAAD in soybean meal, and the SIAAD of soybean meal were higher on d 28 than on d 13 (P<0.05). The 12 and 16 prediction models of SIAAD in soybean meal were successfully developed for broilers at 13 and 28 d of age, respectively. The prediction models with highest fitting degree at 13 d and 28 d are as follows: SID Arg=254.056-1.179CP + 1.212EE-0.409ADF-0.586Ash-0.08TI + 0.885PA-1.509NFE-3.265GE (13 d, R2=0.999,P<0.000 1);SID Trp=- 107.513 + 11.121GE (28 d, R2=0.467, P=0.029 3). In summary, these results indicate that the difference in the chemical compositions among different sources of soybean meal was great. The fitting degree of the prediction model at 13 d of age was higher than that at 28 d of age, and they have good reference value for predicting SIAAD of soybean meal in broilers.

Key words: broilers, days of age, soybean meal, standardized ileal amino acid digestibility, prediction equation

CLC Number: