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A Comparison of Penicillin, Streptomycin and Sulfanilamide for Improving the Fertility of Semen from Bulls of Low Fertility¹

Dairy Cattle Breeding Research Center, Pennsylvania Agricultural Experiment Station, State College

ABSTRACT

Results obtained from seven bulls of low fertility on a split-sample experiment showed a highly significant average increase in fertility when yolk-citrate diluted semen was treated with either penicillin, streptomycin or penicillin plus streptomycin.

Based on 6-mo. non-returns, the improvement in fertility with penicillin, streptomycin and penicillin plus streptomycin amounted to 19, 26 and 23 more cows settled per 100 cows bred, respectively. However, the differences between the three treatments were not significant statistically.

The addition of sulfanilamide to yolk-citrate diluter did not increase breeding efficiency.

Two relatively infertile bulls failed to respond sufficiently to any of the treatments to continue in active service throughout the study.

The results of this experiment indicate that penicillin and streptomycin, either singly or together, offer a valuable means for improving the fertility of semen from certain bulls of low fertility in artificial breeding.

¹ Authorized for publication on Feb. 23, 1951, as paper no. 1660 in the Journal Series of the Pennsylvania Agricultural Experiment Station.