刈割技术对饲草品质和消化率的影响研究

为探讨收获时间和留茬高度对饲草营养品质和消化率的影响,本研究以赤峰地区典型草原牧草为试验原料,设置9个处理,分别是EAL(8月上旬,低留茬高度)、EAM(8月上旬,中留茬高度)、EAH(8月上旬,高留茬高度)、MAL(8月中旬,低留茬高度)、MAM(8月中旬,中留茬高度)、MAH(8月中旬,高留茬高度)、LAL(8月下...

The study of mowing skill on nutrient quality and digestibility of grass

In order to obtain high-quality native grass,the optimum harvest time and stubble height of native grass were selected,and the effects of different harvest time and stubble height on nutrient quality and digestibility of native grass were discussed.Take the grasses of meadow steppe as test materials,there were nine treatments,they were respectively EAL(early August,low stubble height),EAM(early August,moderate stubble height),EAH(early August,high stubble height),MAL(in mid-August,low stubble height),MAM(in mid-August,moderate stubble height),MAH(in mid-August,high stubble height),LAL(in late August,low stubble height),LAM(in late August,moderate stubble height),LAH(in late August,high stubble height),to test the nutritional quality and digestibility of native grass,three times repeats.The results showed that as the harvest time was delayed,the content of natural dry matter(DM),acid detergent fiber(ADF),neutral detergent fiber(NDF)and soluble sugar(WSC)increasing gradually,the DM,ADF,NDF and WSC contents of LA treatment were the highest,respectively 55.79%DM,36.87%DM,68.43%DM and 4.42%DM.The crude protein(CP),digestion energy(DE),dry matter digestibility(IVDMD),crude protein digestibility(IVCPD),acid washing fiber digestibility(IVADFD),neutral detergent fiber digestibility(IVNDFD)gradually decreased,the CP,DE,IVDMD,IVCPD,IVADFD,IVNDFD content of LA treatment were the lowest,respectively 7.48%DM,8.41 MJ/kg,47.12%,61.42%,41.62%and 51.42%.Crude fat(EE)and total energy(GE)showed a trend of increasing first and then decreasing.As the stubble height increased,the natural forage DM,EE,WSC,GE and IVDMD gradually increase,and the stubble height treatment has the highest DM,EE,WSC,GE and IVDMD indicators,respectively 53.89%,1.98%DM,4.67%DM,18.89 MJ/kg,50.1%.ADF,NDF,IVADFD,IVNDFD decreased gradually,ADF,NDF,IVADFD,IVNDFD of the high stubble height treatment were the lowest,respectively 63.53%DM,33.17%DM,43.64%,52.84%,CP content increased first and then decreased,IVCPD showed a decreasing trend before increasing.Therefore,the native grass in Chifeng area should be harvested on August 20,and the stubble height should be 3~6 cm.If the harvest was delayed,the stubble height could be moderately increased to improve the overwintering rate of native grass.