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Fertility of Diluted Bull Semen Containing 100 Micro-Grams of Streptomycin Per Milliliter¹

Storrs (Connecticut) Agricultural Experiment Station, University of Connecticut, Storrs

ABSTRACT

Streptomycin sulfate in the amount of 100 per milliliter was added to diluted bull semen used in the routine operation of an artificial breeding establishment on a split sample control basis for a period of 4 mo. A total of 2,340 cows was inseminated with the control semen, and 2,379 cows with semen containing streptomycin.

Over-all results showed a 61.1 N. R. per cent for the control group as compared to 69.8 N. R. per cent for the streptomycin-treated group. The increase of 8.7 N. R. per cent was found to be highly significant.

An inverse linear relationship between response and the initial level of fertility was noted even though most bulls of "so-called" high efficiency responded in some degree to treatment.

¹ Supported in part by funds received under Project NE 1 of the Research and Marketing Act of 1946.

² Manager, Connecticut Artificial Breeding Association