中文摘要：

为了评估奶牛的健康状况,研究乳汁体细胞数（somatic cell count,SCC）量级分布、乳汁SCC与肝功酶的相关性,探索乳汁SCC变化对肝功酶活性的影响,试验随机选取101头荷斯坦奶牛,测定乳汁SCC和血浆肝功酶指标[丙氨酸氨基转移酶（ALT）、γ-谷氨酰基转移酶（GGT）和天门冬氨酸氨基转移酶（AST）],并分析其相关性。结果表明：被检奶牛中乳汁SCC≥50万个/mL的有24头,占被检总数的23.77%;乳汁SCC≤50万个/mL的有77头,占被检总数的76.24%;乳汁SCC与血浆ALT呈极显著负相关（r=-0.271,P〈0.01）,且存在一定的线性关系。说明根据奶牛乳汁SCC量级水平的分布情况,可以初步评价牛群的整体健康状况,乳汁SCC水平在一定程度上能够反映血浆ALT的水平,或许可作为评估奶牛肝脏健康状况的一个潜在指标。

英文摘要：

To evaluate the healthy status of dairy cattle, and study the magnitude distribution of milk somatic cell count （SCC） and the correlation of milk SCC with liver enzyme to explore the impact of the changes of the milk SGC on liver enzyme activity, 101 Holstein cows were randomly selected in the test. The milk SCC, plasma liver enzyme indicators including alanine aminotransferase （ALT）, gama -glutamyl amin- otransferasc （GGT）, and aspartate aminotransferase （AST） were determined, and then their correlations were analyzed. The results showed that among the detected cows, milk from twenty cows had milk SCC ≥500 000 cells/mL, accounting for 23.77% of the total seizure, and milk from 77 cows had milk SCC ≤500 000 cells/mL, accounting for 76.24% of the total seizure. The milk SCC had a significantly negative correla-ion with plasma ALT （ r = - 0. 271 ,P 〈 0.01 ）, and there was a certain linear relationship. The results indicate that the distribution of the magnitude level of milk SCC can be used to initially evaluate the overall heath of the herds, and the level of milk SCC can reflect the level of plasma ALT to some extent, which may be used as a potential index to evaluate the liver health of cows.