Abstract
Testes of the adult yellow-bellied country-rat were studied with morphometric light micrscopy with special reference to the seasonal changes. Although mature spermatozoa were produced in the seminiferous tubules and present in the lumina of caudae epididymides of all rats studied, however, the seminiferous tubule diameter (STD) in months and in seasons after analysis of variance (ANOVA) showed fluctuations: minimal in summer animals (June and July), maximal in autumn and winter animals (October to December), and intermediate in spring animals (February to April). These data indicate that the activites of spermatogenesis have seasonal variations, i.e. active in spring, autumn and winter, less active in wummer. It is also suggested that these variations are possibly related to rainfall, temperature, and food availability in southern part of Taiwan.
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