Spermatogenesis in Relation to Spermatozoa Concentration in Bovine Semen

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Abstract
The correlation between the number of spermatids in standard sections of the seminiferous tubules and sperm concentration in 13 bulls whose sperm concentration ranged from 0.01 to 20.6 x 105 spermatozoa per microliter was 0.82. The frequency of the various stages of the cycle of the seminiferous epithelium did not change until sperm concentration dropped below 5.0 x 105 spermatozoa per microliter. Qualitative differences in the type of degeneration in the testes were found in bulls having a low sperm concentration.