Diluters for Bovine Semen. V. A Comparison of Heated Milk and Egg Yolk-Citrate as Diluters for Semen from Bulls of High and Low Fertility

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Abstract
Fresh heated homogenized milk containing 1,000 units each of penicillin and streptomycin per ml provided fertility results superior to egg yolk-citrate-penicillin-streptomycin for diluting semen from bulls of relatively low fertility. Bulls showing the lowest fertility rates with yolk-citrate gave the largest differences in favor of heated milk diluter in 2 split sample field trials. There was little difference between heated milk and yolk-citrate, both with antibiotics, for diluting semen from bulls of relatively high fertility. In the 1st trial, semen from 12 bulls, 6 of high and 6 of low fertility, was used to inseminate 6,670 cows, while in the 2d trial, semen from 18 bulls, 9 of high and 9 of low fertility, was used to inseminate 5,373 cows. The difference in favor of heated milk with antibiotics was 4.2% and 3.4% for the high fertility bulls and 11.5% and 12.4% for the low fertility bulls in trials 1 and 2, respectively.