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Influence of Protein Source on Amino Acid Profile of Effluent Flowing from Continuous Culture of Ruminal Contents¹

University of Minnesota^,4, St. Paul 55108

Abstract

Eight dual-flow, continuous culture fermentors were used to determine amino acid (AA) profiles of effluent ruminal digesta when corn gluten meal (CGM), whole soybeans extruded at 149°C (HTS), meat and bone meal (MBM) and soybean meal (SBM) were fed in various combinations. Test protein sources provided 80% of total dietary CP in each of eight diets containing 19.8% CP (DM basis) in the following proportions: 100% CGM; 75% CGM, 25% HTS; 50% CGM, 50% HTS; 25% CGM, 75% HTS; 100% HTS; 33% CGM, 33% HTS, 33% MBM; 100% MBM; 100% SBM. Remaining portions of the diet included corn silage, corn starch and solka-floc. In situ CP degradation was similar for the 100% HTS and 100% SBM diets, indicating that HTS was not adequately protected from microbial degradation. Effluent fermenter flows of essential and nonessential AA uncorrected for bacterial AA were higher (P < .05) for the 100% CGM and 50% CGM:50% HTS diets than for diets containing predominantly HTS, MBM or SBM as the test protein source. Effluent AA flows were not different among the 100% HTS, 100% SBM and 100% MBM diets, even though the latter appeared to be more resistant to microbial degradation. Flow of lysine was lower (P < .05) for the 100% CGM diet and similar for the 100% HTS and 100% SBM diets. However, the 50% CGM:50% HTS diet provided similar or greater flows of lysine and leucine relative to the 100% SBM diet. Results from this study suggest that AA profiles of digesta leaving the rumen can be modified by feeding protein sources resistant to microbial degradation and that combinations of complementary resistant proteins could improve intestinal AA supply and balance.

¹ Published as Paper No. 14,753 of the Scientific Journal Set. of the Minnesota Agric. Exp. Sta. on research conducted under Minnesota Agric. Exp. Project No. 16-048, supported by the Coil. of Agric., The Fats and Proteins Research Foundation, Inc., Des Plaines, IL, The Corn Refiners Assoc., Washington, DC and Triple "F", Inc., Des Moines, IA.

² Present address: The Upjohn Company, Kalamazoo, MI 49001.

³ Address reprint requests to this author.

⁴ Dept. of Anim. Sci.