摘要
本试验主要研究了温湿指数(THI)对奶牛产奶量的影响,同时分析了温湿指数对奶牛的受胎率和健康(子宫炎、乳房炎发病率)方面的影响。试验表明:产奶量随温湿指数的增大而下降;平均温湿指数与平均产奶量为负相关,相关系数r=0.8478;随着温湿指数的不断上升,奶牛的受胎率明显下降,乳房炎、子宫炎等疾病的发病率有上升趋势。
The experiment was to investigate the effect of THI on Holstein's milk yield and healthy.The re sults were shown that milk yield decreased greatly with the in crease off THi dur ing the ex perimental period.These indi cated that there were close rela tions between THI and the Holstein's milk yield(r=-0.8478),fur thermore,with the con stant in creasing of THI ,the rate of pregnancy decreased significantly(p<0.01)and mastitis and uteritis rose to some extent.
出处
《中国奶牛》
北大核心
2002年第4期13-15,共3页
China Dairy Cattle
关键词
温湿指数
荷斯坦牛
产奶量
影响
受胎率
THI
Holstein
milk yield
pregnancy rate
mastitis
uteritis
