Ileal digestibility of amino acids in selected feed ingredients fed to young growing pigs

G A Casas  N W Jaworski  J K Htoo  H H Stein

An experiment was conducted to determine the standardized ileal digestibility (SID) of CP and AA in brewers rice, full-fat rice bran (FFRB), defatted rice bran (DFRB), peanut meal, sesame meal, rapeseed meal, rapeseed expellers, soybean expellers, cassava meal, and bakery meal fed to young growing pigs. Twenty-two barrows (initial BW: 14.09 ± 1.48 kg) were surgically fitted with a T-cannula in the distal ileum and randomly allotted to a replicated 11 × 4 incomplete Latin square design with 11 diets and four 7-d periods in each square. Eleven experimental diets were prepared and test ingredients were the sole source of CP and AA in 10 diets and the eleventh diet was a N-free diet used to measure basal ileal endogenous losses of CP and AA. Chromic oxide (0.4%) was included in all diets as an indigestible marker and ileal digesta were collected on day 6 and 7 of each period. Results indicated that the SID of CP and AA was greatest (P < 0.05) in brewers rice and sesame meal and least (P < 0.05) in cassava meal. The SID of indispensable AA was greater (P < 0.05) in sesame meal compared with all other ingredients except brewers rice. Full-fat rice bran had greater (P < 0.05) SID of Arg, Ile, Leu, Lys, and Met compared with DFRB. The SID of CP and most AA was not different among rapeseed meal, rapeseed expellers, and soybean expellers. Bakery meal had the least (P < 0.05) SID of most AA compared with all other ingredients, with the exception of cassava meal. The concentration of standardized ileal digestible CP was greater (P < 0.05) in sesame meal and peanut meal (482.32 and 452.44 g/kg DM, respectively) than in all other ingredients. Soybean expellers had the greatest (P < 0.05) concentration of standardized ileal digestible Lys (22.98 g/kg DM) followed by rapeseed meal (16.11 g/kg DM) and rapeseed expellers (16.17 g/kg DM). Cassava meal and bakery meal had the least (P < 0.05) concentration of standardized ileal digestible CP and most AA compared with the other ingredients. Concentrations of standardized ileal digestible CP and AA in brewers rice, FFRB, and DFRB were less (P < 0.05) than in rapeseed meal, rapeseed expellers, and soybean expellers. In conclusion, peanut meal and sesame meal have greater concentrations of standardized ileal digestible CP and most AA, with the exception of Lys, than other ingredients. Rapeseed meal, rapeseed expellers, and soybean expellers have the greatest concentrations of standardized ileal digestible Lys.

2018. J. Anim. Sci. 96(6): 2361-2370
https://academic.oup.com/jas/article-abstract/96/6/2361/4944394
DOI：https://doi.org/10.1093/jas/sky114