Differential testicular responses to short daylength in deer mice are reflected by regional and morphological differences in the GnRH neuronal system.

Abstract excerpt

Male deer mice (Peromyscus maniculatus) respond to short photoperiod with a range of spermatogenic responses. About one-third of all short day exposed mice exhibit a complete cessation of spermatogenesis (reproductive responsive), while about an equal number remain reproductively competent (reproductive nonresponsive). These differential spermatogenic responses are mirrored by endocrine measures; reproductive...

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