Kanwar K C, Chaudhry V
Acta Biol Med Ger. 1976;35(12):1643-9.
Seasonal reproductive rhythmicity and concomitant thyroid fluctuations have been studied in the female Indian palm squirrel, Funambulus pennanti. The majority of the squirrels enter estrus during March and April when ovarian follicles attain maximum diameter. Ovulation starts in April and continues till June. A large number of degenerating follicles, indicating decline in ovarian functions, is a characteristic feature of the ovary in August. Minimum percent thyroid 131I uptake is recorded during May and June, i.e. at the onset of mating season. In July, which also marked the gestation period in the majority of the squirrels dissected, thyroid activity significantly increases. Gonadal regression begins in August and this is accompanied by corresponding fall in the thyroid 131I uptake. Alterations in thyroid cytoarchitecture during different months of the year are in accordance with the results obtained from radioiodine uptake studies. Fluctuations in thyroid functions during gonadal regression, recrudescence and peak gonadal activity are discussed in the present communication.
在雌性印度棕榈松鼠（Funambulus pennanti）中，对季节性生殖节律及与之相伴的甲状腺波动情况进行了研究。大多数松鼠在3月和4月进入发情期，此时卵巢卵泡达到最大直径。排卵于4月开始并持续至6月。8月时卵巢出现大量退化卵泡，这表明卵巢功能下降，这是该月卵巢的一个特征。5月和6月，即交配季节开始时，甲状腺131I摄取率最低。在7月，大多数解剖的松鼠也处于妊娠期，甲状腺活性显著增加。性腺退化于8月开始，与此同时甲状腺131I摄取相应下降。一年中不同月份甲状腺细胞结构的变化与放射性碘摄取研究结果一致。本文讨论了性腺退化、再发育和性腺活动高峰期甲状腺功能的波动情况。
