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The Effect of a Combination of Penicillin and Streptomycin upon the Livability and Bacterial Content of Bovine Semen¹

Pennsylvania Agricultural Experiment Station, State College

ABSTRACT

1. The use of a combination of penicillin and streptomycin in levels ranging from 100 to 1,000 units of each per ml. of diluted semen did not affect significantly the livability of bull spermatozoa during a 20-day storage period.
   
2. The use of a combination of penicillin and streptomycin effectively controlled bacterial growth in diluted bull semen.
   

¹ Authorized for publication September 1, 1948, as paper no. 1467 in the Journal Series of the Pennsylvania Agricultural Experiment Station. The penicillin and Btreptomycin were provided by Charles Pfizer and Co., Inc., Brooklyn, New York.

² Dept. of Dairy Husbandry.

³ Animal Pathology Laboratory, Dept. of Animal Husbandry.

⁴ The authors wish to express their appreciation to Dr. W. T. S. Thorp, now with the National Institute of Health, Bethesda, Md., for his suggestions concerning the conduct of the study.