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Relation of Milk Production to the Twinning Tendency¹

Department of Dairy Husbandry, University of Nebraska, Lincoln, Nebraska

ABSTRACT

Upon first thought it seems unreasonable to think of any relation between high milk production and multiple births in cattle. However, when we reflect that twinning in cattle is but one of the evidences of high fertility and that high fertility has been found to be closely correlated with high milk production (1), such a relationship does not seem so unreasonable. The writer, in order to determine whether or not such a relationship does exist has made a study of a random sample of 357 dams of multiple offspring in the Holstein-Friesian breed.

In this study are included the dams of all the male twins in volume 35 of the herd-book, and the dams of all the female twins indicated in volume 40, up to number 474,273. There were a total, then, of 165 dams of male twins or male and freemartin, and a total of 192 dams of female twins.

¹ A part of a thesis, Twinning in Dairy Cattle, submitted in partial fulfillment of the requirements for graduation.