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Effects of level of protein and type of molasses on digesta kinetics and blood metabolites in sheep : the journal of the International Goat Association

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Eight ruminally fistulated wethers were used in a replicated 4x4 latin square to investigate the effects of level of dietary protein (10 or 18%) and type of molasses (BM-sugarbeet molasses, or WSC-wood sugar molasses) on digesta kinetics and blood metabolites in sheep. Wethers were fed a basal diet of 70% chopped prairie hay:30% chopped barley straw (forage) and one of four treatment diets. Treatments were: (1) 10% CP and WSC, (2) 10% CP and BM, (3) 18% CP and WSC, and (4) 18% CP and BM. Diets were formulated to be iso-caloric using barley in the low protein diets to balance for energy. Soybean meal (SBM) was fed to meet the 10% CP and 18% CP protein treatments. Response variables included in vivo and in situ digestion, SBM and forage digesta kinetics, ruminal VFA concentrations, and blood metabolites. Lambs fed WSC tended (P=0.11) to have greater IVDMD, ruminal isobutyrate, and valerate than lambs fed BM. In situ SBM and forage rate of digestion, particulate passage rates, retention time, intestinal transit time, total VFA concentration and acetate:propionate ratio did not differ between types of molasses (P>0.20). Lambs fed the 18% CP diets consumed more feed, had a more rapid rate of SBM in situ digestion, lower ruminal pH, faster SBM and forage particulate passage, and lower SBM and forage retention time than lambs fed the 10% CP diet (P<0.10). Total and individual VFA concentration were greater (P=0.001) in lambs fed the 18% CP diet than lambs fed the 10% CP diet. Aspartate aminotransferase was greater in lambs fed BM than lambs fed WSC. Blood levels of creatinine, chloride, calcium, protein, lactate dehydrogenase, and cholesterol were lower (P<0.11), and triglycerides and blood urea nitrogen higher (P=0.01) in lambs fed the 18% CP diet than those fed the 10% CP diet. Level of dietary protein exerts much greater influence on digestibility and blood metabolites than type of molasses. However, WSC appears to be a suitable replacement for BM given equal price structure.
Hatfield, P.G. , Hopkins, J.A. , Ramsey, W.S. , Gilmore, A.
Includes references
Small ruminant research May 1998. v. 28 (2)
Journal Articles, USDA Authors, Peer-Reviewed
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