Effects of Crude Glycerin Level in Total Mixed Ration on Rumen Ecology and Nitrogen Balance in Goats
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Abstract
Four male crossbred goats, with average liveweight 26 ±3.0 kg were randomly assigned according to a 4x4 Latin square design to receive four total mixed rations (TMR) containing 0, 5, 10 and 20% crude glycerin (CG), respectively. TMR was offered on ad libitum basis. Based on this experiment, there were no significant differences (P>0.05) among treatments regarding DM intake and digestion coefficients of nutrients (DM, CP, NDF, and ADF). Likewise, ruminal pH and NH3-N concentration were unchanged by dietary treatments, except for 20% of CG, NH3-N was lower (P<0.05) than for the diets 10% of CG. No differences were found on mean total ruminal VFA concentration, and molar proportion of butyrate and other VFA, except for molar proportion of acetate (C2), propionate (C3), CH4, and the ratio of C2:C3 were affected (P<0.05) by CG level. Rumen microorganism populations and N balance were similar among treatments (P>0.05). Based on this study, CG levels up to 20% in total mixed ration could be efficiently utilized for goats.
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