Jenkins T C
Department of Animal Science, Clemson University, SC 29634.
J Dairy Sci. 1990 Oct;73(10):2934-9. doi: 10.3168/jds.S0022-0302(90)78982-5.
Commercial soybean lecithin replaced hydrogenated fat in steer diets to determine if phospholipids enhance fatty acid digestion and microbial fermentation in ruminants. Four diets were fed in a 4 x 4 Latin square to four Angus steers with ruminal cannula. One diet contained no added fat (control) and three contained hydrogenated fat and lecithin in weight ratios of 100:0, 86:14, and 72:28. All diets with added fat had lower fatty acid digestibilities compared with the control diet with no difference due to level of lecithin. Ruminal acetate and acetate:propionate ratios were reduced by all fat supplements but reduced less for the supplements containing lecithin. Plasma triglyceride and cholesterol concentrations were increased from dietary fat but not increased as much if lecithin were present in the diet. Feeding lecithin to ruminants does not improve digestibility of hydrogenated fats that are highly saturated.
用商业大豆卵磷脂替代育肥牛日粮中的氢化脂肪，以确定磷脂是否能增强反刍动物的脂肪酸消化和微生物发酵。采用4×4拉丁方设计，给4头装有瘤胃瘘管的安格斯育肥牛饲喂4种日粮。一种日粮不添加脂肪（对照），另外三种日粮添加氢化脂肪和卵磷脂，重量比分别为100:0、86:14和72:28。与不添加脂肪的对照日粮相比，所有添加脂肪的日粮脂肪酸消化率均较低，且不受卵磷脂水平的影响。所有脂肪补充剂均降低了瘤胃乙酸和乙酸:丙酸比值，但含卵磷脂的补充剂降低幅度较小。日粮脂肪会使血浆甘油三酯和胆固醇浓度升高，但日粮中添加卵磷脂时升高幅度较小。给反刍动物饲喂卵磷脂并不能提高高度饱和氢化脂肪的消化率。
