Bayourthe C, Moncoulon R, Vernay M
Ecole Nationale Supérieure Agronomique, Laboratoire d'Ingénierie Agronomique, Toulouse, France.
J Anim Sci. 1993 Apr;71(4):1026-31. doi: 10.2527/1993.7141026x.
Experiments were conducted to determine the effects of supplementing chopped ryegrass hay with 0, 5, 10, or 20% fat coated with ruminal bypass protein (Prolip on ruminal digestion by cows and nutrient digestibility by sheep. Ruminal disappearances of DM, ADF, and NDF were measured by the in sacco technique using a cannulated cow. Degradation of DM, ADF, and NDF was not affected by protected fat supplementation at the 5, 10, or 20% level during the first 16 h in the rumen. In addition, supplementation with Prolip did not influence in vitro fermentation characteristics such as pH and VFA patterns. A digestibility experiment with six mature sheep in a switch-back design showed no decrease in feed intake or other undesired effects between unsupplemented (basal) and Prolip-supplemented diets. Whatever the diet fed to sheep, fiber digestibility was similar; however, DM and nitrogen digestibilities were significantly higher relative to the basal diet when ryegrass hay was substituted at 20% (64.2 vs 59.0% and 74.1 vs 71.1%, respectively). Ether extract digestion was enhanced by increasing level of Prolip; the corresponding values were 48.0, 64.9, 74.6, and 84.6% at 0, 5, 10, or 20% Prolip. Likewise, Prolip supplementation at the 10 or 20% level augmented digestibility of energy (62.7 or 65.9 vs 59.2%). Nitrogen and energy retentions were improved due to the decreases in fecal and(or) urinary excretion(s).
进行了多项实验，以确定用0%、5%、10%或20%瘤胃旁路蛋白包被脂肪（过瘤胃脂肪ProLip）补充切碎黑麦草干草对奶牛瘤胃消化及绵羊养分消化率的影响。使用瘤胃瘘管牛，通过尼龙袋技术测定干物质（DM）、酸性洗涤纤维（ADF）和中性洗涤纤维（NDF）的瘤胃消失率。在瘤胃内的前16小时，5%、10%或20%水平的过瘤胃脂肪补充对DM、ADF和NDF的降解没有影响。此外，添加ProLip对体外发酵特性如pH值和挥发性脂肪酸（VFA）模式没有影响。一项采用交叉设计对6只成年绵羊进行的消化率实验表明，未补充（基础）日粮和补充ProLip日粮之间的采食量没有下降，也没有其他不良影响。无论给绵羊饲喂何种日粮，纤维消化率相似；然而，当黑麦草干草替代比例为20%时，DM和氮消化率相对于基础日粮显著提高（分别为64.2%对59.0%和74.1%对71.1%）。随着ProLip水平的增加，乙醚提取物消化率提高；在0%、5%、10%或20% ProLip水平下，相应的值分别为48.0%、64.9%、74.6%和84.6%。同样，10%或20%水平的ProLip补充提高了能量消化率（分别为62.7%或65.9%对59.2%）。由于粪便和（或）尿液排泄减少，氮和能量保留得到改善。
