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A Comparison of the Fertility of Bull Semen Diluted in Egg Yolk-Citrate and Homogenized Milk¹

Dairy Section, Kentucky Agricultural Experiment Station, Lexington

ABSTRACT

When homogenized milk was heated at 97° C. for 10 minutes and then used for bull semen, no significant differences were found in 60–90 day nonreturns between it and the standard yolk-citrate diluter. A highly significant difference was found in the per cent nonreturns between 2-day-old and 3-day-old semen with milk and yolk diluters. Milk diluter gave the best results with 2-day-old semen and yolk-citrate diluter was best with 3-day-old semen. There was a drop of 4.8% from 2-day-old to 3-day-old semen with yolk-citrate and 11.2% drop with milk.

There was also a statistically significant difference between bulls in per cent nonreturns. The tendency was for the bulls of lower fertility to show improvement in per cent nonreturns when milk diluter was used.

¹ The investigation reported in this paper is in connection with a project of the Kentucky Agricultural Experiment Station and is published by permission of the director.

² Manager, Kentucky Artificial Breeding Association.