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It has long been recognized that in many vertebrates spermatogenesis is not continuous but tends to occur at one rather definite period of the year. Cyclic spermatogenic activity is characteristic of the majority of mammals with the exception of such domesticated and semidomesticated species as the guinea pig, rabbit, rat, dog, boar, ram, stallion, bull and man. These species have long been classified as continuous breeders but evidence is now accumulating to show that although spermatozoa are produced throughout the entil"e year certain seasonal trends in the rate of spermatogenesis and the degree of fertility are evident. The purpose of this study was to determine the influence of season upon semen quality in the dairy bull.
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Erb et al. (1942) studied this question.
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