放牧苏尼特肉羊甲烷排放影响因素研究

Influencing Factors of Methane Emission from Grazing Sunit Sheep

试验研究了内蒙古苏尼特肉羊饲养管理方式、补饲料粗蛋白水平、放牧制度对羊只甲烷(CH_(4))排放的影响。结果表明:不同的饲养管理方式,对CH_(4)排放具有显著影响(P<0.05),排放浓度为放牧+补饲>舍饲苜蓿>天然放牧,浓度分别为0.32%、0.21%、0.18%;补饲料粗蛋白水平对羊只甲烷排放作用极显著(P<0.01),CH_(4)排放顺序为粗蛋白水平14%>17%>20%,浓度分别为0.36%、0.28%、0.24%;人工草地放牧条件下,采取划区轮牧,还是连续放牧,对苏尼特肉羊CH_(4)排放没有显著性(P>0.05)影响。畜牧生产者可参考选择适宜的管理方式、营养水平,保证生产并降低CH_(4)排放。

This study investigated the effects of different management practices,crude protein levels in supplemental feed,and grazing systems on methane emissions from Sunit mutton sheep in Inner Mongolia.The results indicate that different management practices have a significant impact on CH 4 emissions(P<0.05),and the emission concentrations ranked as follows:grazing with supplementation>housed feeding with alfalfa>natural grazing,with the concentrations beings 0.32%,0.21%,and 0.18%,respectively.The level of crude protein in supplemental feeds has an extremely significant effect on methane emissions(P<0.01),with the emission order being crude protein 14%>17%>20%,and concentrations being 0.36%,0.28%,and 0.24%,respectively.Under artificial pasture grazing conditions,both the rotational grazing and continuous grazing exert no significant impact on CH 4 emissions from Sunite sheep(P>0.05).Therefore,the livestock producers can select appropriate management practices and nutritional levels to ensure production while reducing CH 4 emissions.