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The Relation of Endocrinology to the Inheritance of Milk Production¹

Missouri Agricultural Experiment Station

Abstract

Due to the fact that the inheritance of quantitative characters such as body size and milk yield are probably dependent upon the action of a large number of genes, relatively little progress has been made in the genetic analysis of characters of more practical importance to animal breeders.

The formal genetic approach to the problem has neglected the complex development between the time of conception and the final expression of the character whether at birth or at maturity. Yet it is during these periods that the genes are expressing their individual and collective influence directly or indirectly upon the characters concerned. It would appear that much valuable information could be secured by an analysis of the hormones influencing each stage of development of the character and the relative influence of the hormones and other modes of genetic determination, such for example, as that localized in the anlage of the gland cells.

¹ Contribution from the Department of Dairy Husbandry, Missouri Agricultural Experiment Station, Journal Series No. 370.