云南黄牛对6种牧草瘤胃降解规律的研究

采用尼龙袋法评定了云南黄牛对六种牧草的DM、CP、NDF和ADF有效降解率，并对牧草降解模型中的参数和有效降解率与牧草中营养成分的相关性进行了分析。试验结果显示：六种牧草DM的有效降解率为苜蓿干草粉最高，和一年生黑麦草粉差异不显著（P>0.05），和依次降低的苜蓿草块、光叶紫花苕粉、大麦秸粉、非洲狗尾草粉间差异极显著（P<0.01）；六种牧草CP的有效降解率为苜蓿干草粉最高，和依次降低的苜蓿草块、一年生黑麦草粉、光叶紫花苕粉、大麦秸粉、非洲狗尾草粉间差异极显著（P<0.01）；六种牧草NDF和ADF的有效降解率为苜蓿干草粉最高，和苜蓿草块差异不显著（P>0.05），和依次降低的一年生黑麦草粉、光叶紫花苕粉、大麦秸粉、非洲狗尾草粉间差异极显著（P<0.01）。综合测定的各个营养指标分析，云南黄牛对不同牧草的利用率大小为：苜蓿干草>苜蓿草块≈一年生黑麦草>光叶紫花苕>大麦秸>非洲狗尾草。牧草降解模型中的参数和有效降解率均与牧草营养成分中的CP含量呈较强的正相关，而与NDF和ADF含量呈较强的负相关。

Studies on Rumen Degradabilities of Six Forages in Yunnan Yellow Cattle

Nylon-bag technique was used to evaluate the disappearance rate and effective degradability of DM, OM, CP, NDF and ADF in six forages, meanwhile, the correlations were analyzed between degradation model parameters, effective degradability and forage nutrients. The results showed that: DM effective degradability of alfalfa powder was the highest in six forages , and there was no significant difference between annual ryegrass powder and alfalfa powder(P>0.05), but there were significant difference between alf...