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A Comparison of Homogenized Whole Milk and Egg Yolk-Phosphate as Diluters for Bull Semen

Badger Breeders Cooperative, Shawano, Wisconsin

ABSTRACT

A comparison has been made of yolk-phosphate and milk-diluted semen from 16 Guernsey and 22 Holstein bulls in December and in May. In previous years, these have been months of relatively high and low fertility, respectively. Nonreturn rates on milk exceeded those on yolk-phosphate by 7.9 and 9.2 per cent for the Holsteins in the two months and by 5.0 and 18.0 per cent for the Guernseys. The two breeds did not differ significantly on yolk-phosphate in December or on milk in either month; in May the Guernseys were lower by 11.1 per cent than the Holsteins on yolk-phosphate.

A total of 6,009 experimental first services were made with milk-diluted semen, resulting in a 69.8 per cent 60–90 day non-return, compared to a total of 6,060 experimental first services with yolk-phosphate diluted semen, which resulted in a 59.2 per cent 60–90 day non-return. Bulls of both breeds that tended to be lowest in non-return rates on yolk-phosphate were the ones that tended to give the greatest added response when their semen was diluted with milk.