不同茬次的苜蓿干草在奶牛瘤胃中的降解规律研究

Studies on Rumen Degradabilities of Different Cuts of Alfalfa Hay for Dairy Cows

旨在研究不同茬次苜蓿干草在瘤胃中的降解规律,为奶牛合理利用苜蓿提供理论依据。选择3头装有永久性瘤胃瘘管,体重500 kg左右的泌乳后期健康中国荷斯坦奶牛,采用尼龙袋法研究不同茬次苜蓿干草的粗蛋白(CP)、酸性洗涤纤维(ADF)、中性洗涤纤维(NDF)和干物质(DM)在奶牛瘤胃中的降解变化规律。结果表明:在相同培养时间段内,不同茬次的苜蓿干草CP降解率依次降低,ADF、NDF、DM降解率依次升高。在同一时间点,ADF、NDF、DM降解率与茬次成正相关,CP降解率与茬次成负相关。

The objective of this paper is to explore different Degrada theoretical data for dairy cows. Three healthy Chinese Holstein cows tion law of alfalfa hay in rumen, to provide about 500kg weight during the dry period were selected as experiment animals. This experiment measures the decomposing rates of the dry material （DM）, crude protein（CP）, neutral detergent fiber （NDF）, acid detergent fiber （ADF）in cattle rumen by applying nylo bag method. The results are showed as follows： After culture of the same time, the degradation rate of CP decreased as the stubble increased; conversely, the degradation rate of NDF, ADF and DM were all increased with the stubble times. At the same time point, NDF, ADF, DM degradation rate is positively correlated with Cutting stubble times, CP degradation rate was negatively associated with Cutting stubble times. The first crop of alfalfa the highest rate of protein degradation, fourth crop of alfalfa DM, NDF, ADF degradation rate was highest.