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The Ability of Dairy Bulls to Withstand Regular Service for Artificial Insemination during One Year^*

E. J. Weatherby, R. P. Reece and J. W. Bartlett

New Jersey Agricultural Experiment Station

Abstract

In order that a dairy cow return the greatest profits to her owner she should calve first at about two years of age and thereafter every twelve months during her productive life. To make these events possible it is necessary that the reproductive systems of the cow and the bull function normally. The rapid increase in the number of cows inseminated artificially each year makes it exceedingly important that dairymen obtain additional information on the physiology of reproduction in dairy cattle.

Since November 1, 1939 three hundred and sixty-two semen samples have been obtained from 5 dairy bulls by means of the artificial vagina. These samples were observed for volume, concentration, and longevity.

All semen samples were carried from the barn in vacuum bottles at a temperature of approximately 70°F. Within a few minutes, concentration was calculated by the use of a hemacytometer with a Neubauer counting chamber. In order to cool the semen rather slowly for storage, the water in the vacuum bottles was poured into a water bath and the semen placed therein.

^* Journal Series paper of the New Jersey Agricultural Experiment Station, Department of Dairy Husbandry.

This work has been supported by a grant from the National Dairy Products Corporation, New York City.