中国荷斯坦牛SCC变化规律及其与产奶性状之间的关系  

The Distribution of SCC and Its Correlation with Milk Production Traits in Chinese Holsteins

作　　者：马裴裴[1] 俞英[1] 张沅[1] 张勤[1] 王雅春[1] 孙东晓[1] 张毅[1] 

机构地区：[1]中国农业大学动物科技学院,北京100193

出　　处：《畜牧兽医学报》2010年第12期1529-1535,共7页ACTA VETERINARIA ET ZOOTECHNICA SINICA

基　　金："863"重大项目"牛全基因组SNP芯片的检测与分析"(2008AA101002);"948"项目"我国奶牛群体遗传改良关键技术与优良育种材料引进"项目(2006-G48(3));"十一五"国家科技支撑计划课题(2008BADB2B03;2008BADB2B03-05);转基因生物新品种培育重大专项(2009ZX08009-146B);北京市农业局试验示范项目(201000222)资助

摘　　要：本研究旨在分析北京地区中国荷斯坦牛测定日体细胞数的变化规律及其与产奶性状之间的关系,推断适于中国荷斯坦牛隐性乳房炎的判定标准。通过对北京地区76个荷斯坦牛牛场63510头母牛的DHI数据进行整理筛选,按每毫升奶中体细胞数(SCC)情况,用SAS8.2将其划分为12个子数据集及8个累积数据集。首先用Excel对12个子数据集的SCC和产奶性状作图,然后用Matlab的Spline函数对12个子数据集及8个累积数据集做泌乳期的SCC曲线。除乳脂率外,12个子数据集的SCC均值与各产奶性状均值的变化趋势相关显著,随着SCC的增长,产奶量、乳蛋白量和乳脂量逐渐下降,乳蛋白率逐渐上升(P<0.001)。累计数据集作图发现,SCC<20万与SCC<10万的差异较大,而SCC<50万与SCC<40万差异较小。结果表明,为有效降低隐性乳房炎发病率,北京地区中国荷斯坦牛牛群宜以10万～50万SCC作为隐性乳房炎划分标准。The objective of this study was to analyze the variation trends of the somatic cell counts（SCC） and its correlation with milk production traits in Chinese Holsteins in Beijing,then to conclude the criteria for sub-mastitis prediction.The dairy herd improvement（DHI） data came from 76 Holstein herds including 63 510 cows were tided up in this study.Twelve subsets and eight cumulative subsets were divided according to certain conditions using SAS 8.2 software.First,the curves of SCC and milk production traits of the twelve subsets were ploted with Excel.Then the SCC curves of the 12 subsets and eight cumulative subsets were ploted using the Spline function of Matlab,respectively.Except fat percentage,the averages of the other four milk production traits were highly correlated with the mean of the SCC for the 12 subsets（P0.001）.Milk yield,milk protein yield and milk fat yield decreased following the increase of SCC,while the protein percentage increased.The curves of the cumulated subsets indicated that there was significant difference between average of SCC100 000 subset and of SCC200 000 subset.But the difference between average of SCC400 000 subset and of SCC500 000 subset was not significant.Our results indicated that the criterion of subclinical mastitis in Chinese Holsteins should choose 100 000 to 500 000 SCC per milliliter milk.

关 键 词：体细胞数 分布规律 产奶性状 相关 隐性乳房炎 

分 类 号：S813.3[农业科学—畜牧学] Q343.15[农业科学—畜牧兽医]