裹包全混合日粮瘤胃降解特性的研究

Study on rumen degradability characteristics of baled total mixed ration

试验选用2头安装有永久性瘤胃瘘管的荷斯坦奶牛作为试验动物,采用尼龙袋法研究了裹包贮存、精粗比和水分含量对全混合日粮(TMR)营养成分瘤胃降解特性的影响。结果表明:裹包贮存可显著提高TMR饲料干物质(DM)、粗蛋白(CP)和中性洗涤纤维(NDF)的瘤胃消失率和有效降解率(P<0.05)。DM和CP的瘤胃消失率及有效降解率随TMR饲料精料水平的提高显著增加(P<0.05)。水分含量60%组TMR饲料中CP的有效降解率显著高于40%和50%组(P<0.05),40%和50%组间差异不显著(P>0.05)。因此,裹包贮存可提高TMR饲料中营养物质瘤胃消失率和有效降解率(P<0.05),营养物质的瘤胃消失率和有效降解率随TMR饲料精粗比的增加而增加,水分含量对裹包TMR中不同营养物质的消失率和有效降解率有不同影响。

Two dairy cows fitted with rumen cannulas were selected to study the effect of baled ensiling, concentrate to forage ratio （C/F）, and moisture content on rumen degradibility characteristics of total mixed ration （TMR） using rumen nylon bag method. The results showed that baled ensiling increased dry matter （DM）,crude protein （CP） and neutral degradation fiber （NDF） rumen disappearance and effective degradability of TMR （P^0.05）. Rumen disappearance rate and effective degradability of DM and CP increased with concentrate content of TMR increasing （P〈0.05）. Compared with 40% and 50% moisture groups, effective degradability of CP were higher （P〈0.05） in 60% moisture, while no difference was observed between 40% and 50% moisture groups. It indicated that the baled ensiling could increase rumen disappearance and effective degradability of TMR nutrients （P〈0.05）. Along with the increase of C/F, rumen nutrient disappearance and effective degradability increased（P〈0.05）, and the effects of moisture content were varied on rumen disappearance and effective degradability of different TMR nutrients.