Effects of increasing concentrations of glycerol in concentrate diets on nutrient digestibility, methane emissions, growth, fatty acid profiles, and carcass traits of lambs.

摘要: Two experiments were conducted to evaluate the effects of increasing concentrations glycerol in concentrate diets on total tract digestibility, methane (CH4) emissions, growth, fatty acid profiles, and carcass traits lambs. In both experiments, control diet contained 57% barley grain, 14.5% wheat dried distillers grain with solubles (WDDGS), 13% sunflower hulls, 6.5% beet pulp, 6.3% alfalfa, 3% mineral-vitamin mix. Increasing (7, 14, 21% dietary DM) DM replaced for grain. As was added, alfalfa meal WDDGS increased maintain similar CP NDF among diets. Exp.1, nutrient digestibility CH4 emissions from 12 ram lambs measured a replicated 4 × Latin square experiment. Exp. 2, lamb performance evaluated 60 weaned that blocked by BW randomly assigned 1 treatments fed slaughter weight. 1, not altered (P = 0.15) inclusion Exp.2, linearly decreased DMI < 0.01) tended 0.06) reduce ADG, resulting final BW. Feed efficiency affected Carcass SFA or MUFA proportions subcutaneous fat 0.77) glycerol, but PUFA 0.01). Proportions 16:0, 10t-18:1, linoleic (18:2 n-6) n-6/n-3 ratio reduced those 18:0 (stearic acid), 9c-18:1 (oleic glycerol. When included up DM, did affect based finishing Glycerol may improve backfat profiles reducing 10t-18:1 ratio.