Suzuki M, Kaji K, Nigi H
Department of Oral Anatomy I, School of Dentistry, Hokkaido Univeristy, Sapporo, Japan.
J Vet Med Sci. 1992 Jun;54(3):551-6. doi: 10.1292/jvms.54.551.
Testis size, seminiferous tubules and plasma testosterone concentrations showed conspicuous annual changes in Sika deer of Hokkaido, Japan. The onset of the spermatogenic process occurred in July or August. Spermatogenic activity had already reached its height in late October, at the beginning of the rutting season, and had begun to decline in late December. Spermatogenesis had stopped in February or March. Plasma testosterone concentrations showed very high levels in late October and early November, but was almost at the basal level in February, March, June and December. The wide individual variation of the plasma levels in October suggest pulsatile secretions of testosterone.
日本北海道梅花鹿的睾丸大小、生精小管和血浆睾酮浓度呈现出明显的年度变化。生精过程于7月或8月开始。在10月下旬发情季节开始时，生精活动已达到高峰，并于12月下旬开始下降。精子发生在2月或3月停止。血浆睾酮浓度在10月下旬和11月初处于非常高的水平，但在2月、3月、6月和12月几乎处于基础水平。10月血浆水平的个体差异较大，提示睾酮有脉冲式分泌。
