PSVI-18 Nutritional Value of High-protein Yeast Products Fed to Growing Pigs in Comparison to Commonly Used Protein Sources in Swine Diets

Abstract

Abstract Alternative ingredients and co-products from the ethanol and biofuel industries represent an opportunity for utilization in swine diets. The objective of this study was to determine standardized ileal digestibility (SID) of AA in two yeast-based high protein DDGS products (HP-DDGS) fed to growing pigs in comparison to common swine diet protein sources. Cornstarch-based diets were formulated using six ingredients as the sole source of AA: spray dried HP-GDDS, ring dried HP-GDDS, conventional DDGS, soybean meal (SBM), enzymatically-treated soybean meal (HP300) and fishmeal (FM). A N-free diet was used to estimate endogenous ileal AA losses. Seven barrows (25 ± 0.8 kg BW) were fitted with a simple T-cannula at the distal ileum. The experiment was conducted as a 7 × 7 Latin square design with 7 collection periods of 7d (5d adaptation and 2d ileal digesta collection). Pigs were fed at 4% of BW. Diets and ileal digesta were analyzed for AA and titanium. Digestibility values were calculated according to the marker method. The CP and AA concentrations in Spray HP-GDDS and Ring HP-GDDS samples were higher than in the DDGS sample and similar to the SBM and HP300 samples. General SID values were within the mean +/- SD of NRC (2012) values for the six ingredients evaluated. The SID of AA was greater (P < 0.05) in HP300 than in the other protein sources (90.09 vs. 79.97). The SID values were generally similar (P > 0.05) in SBM, FM, Spray HP-GDDS, and Ring HP-GDDS samples (81.49, 78.71, 81.52, and 79.20). The SID values for Lys were greater (P < 0.05) in Spray HP-GDDS than in Ring HP-GDDS and DDGS (83.56 vs. 77.33 and 68.53). The HP-GDDS products are potential alternative ingredients to commonly used protein sources in swine diets and the obtained data allows its use in practical diet formulation.