130 Comparison of amino acid digestibility in fish meal, porcine plasma, porcine red blood cell, and blood meal between broiler chickens and young pigs

Abstract

Abstract The objective of this study was to compare the standardized ileal digestibility (SID) of AA in fish meal (FM), porcine plasma (PP), porcine red blood cell (RBC), and blood meal (BM) between broiler chickens and pigs. Five diets were prepared for both species including 4 diets containing test ingredients and a nitrogen-free diet. In Exp. 1, 416 male broiler chickens (initial BW = 705 ± 100.0 g) at d 18 post hatching were assigned to diets in a randomized complete block design with BW as a blocking factor. After 5 d of feeding, birds were euthanized for collection of ileal digesta. In Exp. 2, 10 barrows (initial BW = 22.1 ± 1.54 kg) surgically fitted with T-cannulas at the distal ileum were allotted to duplicate 5 × 4 incomplete Latin square design with 5 diets and 4 periods. Each experimental period consisted of 5-d adaptation and 2-d ileal digesta collection periods. Data for Exp. 1 and 2 were considered together as a 2 × 4 factorial arrangement with the effects of species (i.e., broiler chickens and pigs) and four diets (i.e., FM, PP, RBC, and BM). There were interactions (P < 0.05) between species and diets on the SID of AA except for Pro. The SID of Lys, Met, Thr, and Trp in FM, PP, and RBC for broiler chickens were not different from values for pigs; however, the SID of respective AA in BM for broiler chickens were less than values for pigs. The SID of indispensable AA in BM were less than in FM, PP, or RBC within each species, but the SID of indispensable AA in BM for broiler chickens was less than values for pigs. In conclusion, utilization of AA in animal protein ingredients containing high concentration of CP varies between broiler chickens and pigs.