PSVI-4 Digestible and metabolizable energy content, and standardized ileal digestibility of amino acids in novel corn co-products for swine

Abstract

Abstract The objective of this study was to determine and compare the digestible energy (DE) and metabolizable energy (ME) content, and standardized ileal digestibility (SID) of amino acids in novel corn co-products and dried distillers’ grains with solubles (DDGS) for swine. Seven corn co-products were evaluated including 2 conventional DDGS (DDGS-A and DDGS-B), 1 corn fiber and solubles (CFS), 2 high protein distillers’ grains (HPDG-A and HPDG-B), and 2 high yeast and protein co-products (HYP-A and HYP-B). In Exp.1, 32 barrows (BW = 24.2 ± 3.4 kg) were housed individually in metabolism crates and randomly allotted to a corn-soybean meal basal diet or 1 of 7 diets containing 30% of a co-product in a randomized two-period crossover design. Feces and urine were collected in 2 periods (7-d adaptation and 4-d collection). In Exp.2, 16 ileal-cannulated barrows (BW = 37.0 ± 3.8 kg) were assigned to 1 of 8 diets in a repeated 8 × 4 Youden square design. An N-free diet, and 7 test diets containing 1 of 7 corn co-products as the sole protein source were used. Diets were fed to pigs for four 7-d periods (5-d adaptation and 2-d ileal digesta collection). The HYP-A and HYP-B had the greatest (P < 0.05) DE (4,309 and 4,183 kcal/kg DM, respectively) and ME (4,118 and 3,972 kcal/kg DM, respectively), and HPDG-B had the lowest (P < 0.05) DE and ME (2,266 and 2,168 kcal/kg DM, respectively) among all corn co-products. The SID of Arg, His, Ile, Lys, Met, Thr, and Val were similar among DGS-B, HPDG-A, HYP-A, and HYP-B, while HPDG-B had the lowest (P < 0.05) SID coefficients for all AA and CP. The high ME and SID Lys, Met, Thr, and Trp content of HYP-A and HYP-B indicate greater feeding value for swine compared to other co-products evaluated.