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Genetic and Phenotypic Relationships between Clinical Mastitis, Laboratory Criteria, and Udder Height¹

Department of Animal Industry, North Carolina State College, Raleigh

ABSTRACT

Genetic aspects of mastitis resistance were investigated where quantitative scores were determined for clinical mastitis, bacterial infection, and leucocyte count. Heritability and repeatability estimates were obtained for these scores, and phenotypic and genetic correlations between scores were estimated. Correlations also were obtained between udder height and the scores for clinical mastitis, bacterial infection, and leucocyte count.

Heritability estimates for clinical mastitis obtained from the paternal sister correlation and daughter-dam regression were inconsistent. Repeatability for clinical mastitis was estimated at .31. Estimated genetic correlations from the two analyses were .29 and .23 for clinical mastitis with bacterial infection, and .80 and .98 for clinical mastitis with leucocyte count. Udder height was found to be negatively correlated with scores for clinical mastitis, bacterial infection, and leucocyte count.

¹ Contribution from the Department of Animal Industry, North Carolina Agricultural Experiment Station, Raleigh, North Carolina. Published with the approval of the Director of Research as Paper No. 1068 of the Journal Series. This research was supported in part by the Dairy Cattle Research Branch, ARS, USDA.

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