In attempts to control the bacteria which are present in bull semen, it was found that penicillin (2) retarded bacterial growth at levels which did not exert an injurious effect upon the livability of the spermatozoa. The first experiment to determine the effect of penicillin upon fertility (1) showed that the addition of either 500 or 1,000 units of penicillin per ml. of diluted semen did not affect significantly the fertility of semen from bulls of relatively high breeding efficiency.
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John O. Almquist (1949) studied this question.
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