多种光周期和松果体切除对雄性草原田鼠（Microtus pennsylvanicus）性腺、被毛及体重的影响。

The influence of multiple photoperiods and pinealectomy on gonads, pelage and body weight in male meadow voles, Microtus pennsylvanicus.

Rhodes D H

Department of Biology, Saint Anselm College, Manchester, New Hampshire 03102.

Comp Biochem Physiol A Comp Physiol. 1989;93(2):445-9. doi: 10.1016/0300-9629(89)90064-9.

Abstract

Chronic exposure of male Microtus pennsylvanicus to photoperiods with 8, 10 and 12 hr of light per day results in gonadal regression, molt to winter pelage and significant reductions in body weight and food consumption relative to voles kept on photoperiods with 13 and 14 hr of light per day. 2. A precise critical daylength is observed in this species as exposure to photoperiods with 12 or fewer hours of light per day results in complete gonadal involution, seasonal molt and loss of body weight. 3. Pinealectomy abolishes all short-photoperiod induced responses in this species.

摘要

雄性宾夕法尼亚田鼠长期暴露于每天光照8小时、10小时和12小时的光周期下，会导致性腺退化、换毛为冬毛，与饲养在每天光照13小时和14小时光周期下的田鼠相比，体重和食物摄入量显著减少。2. 在该物种中观察到一个精确的临界日长，因为暴露于每天光照12小时或更少小时的光周期会导致性腺完全退化、季节性换毛和体重减轻。3. 松果体切除消除了该物种中所有短光周期诱导的反应。