Known individt/al and species differences in ability to resist infections of certain diseases furnish evidence that genetic differences play a part in conditioning resistance to disease. Plant breeders have been able to develop resistant varieties and strains, but preventive and therapeutic measures largely remain the basis of disease control in economic animal populations. In dairy cattle mastitis presents a disease problem that has not been controlled effectively by either prophylactic or therapeutic measures. The problem has received only limited attention from a genetic standpoint, but the tremendous economic significance of this disease demands attack from every feasible approach.
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Legates et al. (1952) studied this question.
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