Coffey E M, Vinson W E, Pearson R E
J Dairy Sci. 1986 Aug;69(8):2163-72. doi: 10.3168/jds.S0022-0302(86)80649-X.
Lactation records for somatic cell counts in milk, bacteriological culture results, antibiotic treatment for mastitis, and production were formed for cows in 30 cooperating dairy herds in Virginia. A second data set, including somatic cell counts and production information for cows in approximately 400 herds in Virginia (not including the original 30), was used to evaluate sires genetically for somatic cell count. Approximate genetic correlations between measures of cell count and measures of infection ranged from .36 to .67. These were highest (lowest) for frequency of infection by major (minor) pathogens. Corresponding phenotypic correlations were similar but slightly smaller. Neither somatic cell counts nor measures of infection were well correlated with treatment. Production traits generally had small, negative genetic and phenotypic relationships with cell counts, rates of infection, and measures of treatment. Correlations for evaluations of sires for cell count were positive with daughter averages for infection rates (.20 to .38) and treatment measures (.02 to .13). Largest (absolute value) correlations between evaluations of sires for cell count and production traits were for fat percentage (-.38) and fat yield (-.28). Evaluation and selection of sires for decreased somatic cell count may augment management and treatment programs in the reduction of mastitis incidence.
为弗吉尼亚州30个合作奶牛场的奶牛建立了关于牛奶体细胞计数、细菌培养结果、乳腺炎抗生素治疗及产量的泌乳记录。第二个数据集包括弗吉尼亚州约400个牛群（不包括最初的30个）奶牛的体细胞计数和生产信息，用于对种公牛的体细胞计数进行遗传评估。细胞计数指标与感染指标之间的近似遗传相关性在0.36至0.67之间。对于主要（次要）病原体的感染频率，这些相关性最高（最低）。相应的表型相关性相似但略小。体细胞计数和感染指标与治疗均无良好相关性。生产性状通常与细胞计数、感染率和治疗指标具有较小的负遗传和表型关系。种公牛细胞计数评估与女儿感染率平均值（0.20至0.38）和治疗指标（0.02至0.13）之间的相关性为正。种公牛细胞计数评估与生产性状之间最大（绝对值）的相关性出现在乳脂率（-0.38）和乳脂产量（-0.28）上。对体细胞计数降低的种公牛进行评估和选择，可能会加强降低乳腺炎发病率的管理和治疗方案。
