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Genetic Relationships in Resistance to Mastitis in Dairy Cattle¹

North Carolina State College, Raleigh

ABSTRACT

Data from 11 North Carolina dairy herds involving 956 animals were studied, and an estimate of heritability of resistance to mastitis of 0.27 ± 0.10 was obtained. The data also suggest that dominance deviations contribute to the total genetic variance. No demonstrable phenotypic relationship between mastitis and production was evident from the data. Use in artificial insemination of sires whose dams and sisters demonstrate resistance to mastitis presents the most promising immediate breeding approach.

¹ Approved for publication as per paper no. 425 in the Journal Series of the North Carolina Agricultural Experiment Station.

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