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An investigation has been conducted to study the source and formation of the androgenie activity o the incubated cow feces. The results indicate that the androgenic activity is dependent upon the presence of two factors: (1) an androgen precursor which is present only in cow feces, and (2) microbial activity which is present both in bull and in cow feces. Apparently, progesterone can serve as a precursor of the androgenic substance.
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Lueker et al. (1960) studied this question.
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