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A study of the fluctuating factors in the seminiferous epithelial cycle in mice with special attention to statistical studies on diurnal fluctuations and on variations due to testes and testis loci in the relative frequencies of the stages.


 The influence of the testis and loci within testes on diurnal variations and fluctuations in the seminiferous epithelial cycle was investigated in 30 50-60 day old mice. Histological examination of the seminiferous tubules revealed a typical cellular arrangement for each stage of spermatogenesis in virtually all of the specimens. No apparent diurnal fluctuations were observed in the relative frequency of the various stages between specimens obtained at 6 different times of sacrifice or among the uniform periods over a 24-hour period. However, a significant (p less than .05) difference in the frequencies of the stages was observed between testes among individuals and loci within testes.
