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Inheritance of Susceptibility to Mastitis¹

Animal Breeding Subsection, Iowa Agricultural Experiment Station, Ames

ABSTRACT

The average intra-herd regression of daughter on dam within 27 herds in New Zealand was 0.19 for whether they came down with mastitis. Since the 95 per cent confidence interval for this is of the order of 0.03 to 0.35 its true magnitude in the population from which these data are a sample is not known closely; yet it appears that differences in susceptibility to mastitis have a strong genetic background. Selection against cows which are severely affected or have severely affected sisters or daughters should lower the incidence of mastitis. The method of investigation appears worth extending to more data.

¹ Journal Paper no. J-1718 of the Iowa Agricultural Experiment Station, Ames, Project no. 1053.