J. Anim Sci.
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J. Anim Sci. 1955. 14:731-738.
© 1955 American Society of Animal Science
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Influence of Antibiotics on Fertility of Bull Semen Diluted with Milk1

R. E. Erb, L. E. Mikota2, F. H. Flerchinger and M. H. Ehlers

State College of Washington

Abstract

Penicillin and streptomycin were compared singly and in certain combination at levels of 250, 500 and 1000 units and micrograms, respectively, per ml. of semen diluted with heated, homogenized milk. Sulfanilamide at the rate of 0.3 percent was included with penicillin and streptomycin in one trial. Eight trials involving 67,290 first and second services were conducted.

Penicillin failed to increase total 120-day nonreturns and reduced nonreturns (P less than 0.03) for semen used the third day after collection as compared with untreated semen. Penicillin decreased the 29- to 120-day nonreturn decline 1.1 percent.

Streptomycin included at the rate of 1000 mcg. per ml. of diluted semen was equal or superior to other levels of streptomycin or combinations with penicillin. Nonreturn decline from 29 to 120 days was generally reduced when semen contained antibiotics. This was most noticeable for lower fertility bulls.

Results of this and other studies show that antibiotic-treated semen reduces differences between bulls in routine artificial service with respect to nonreturns and nonreturn declines with the latter differences being practically eliminated.

Footnotes

1 Scientific Paper No. 1378, Washington Agr. Exp. Sta., Pullman. Project 1107. Appreciation is expressed to the management of Northwest Co-op Breeders, Burlington, Washington, for assistance in conducting these trials.

2 Northwest Co-op Breeders, Burlington, Washington.






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Copyright © 1955 by the American Society of Animal Science.