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Earlier investigations at this Experiment Station (1, 2) demonstrated that either penicillin or streptomycin will inhibit the growth of bacteria in diluted bull semen. However, concentrations as high as 2,000 units per mh of diluted semen of either one alone failed to provide complete inhibition. In both studies organisms resistant to the antibiotic employed were encountered in certain of the diluted semen samples.
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Almquist et al. (1949) studied this question.
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