• 作者： 崔文慧; 林芳郁; 黃仲嘉
• 作者服務機構： 國立臺灣大學動物系
• 中文摘要： 本文為就外部形態和生殖腺及副性腺組織學，研究台北縣坪林地區赤腹松鼠之生殖生物學1978年12月至1980年2月
  間，逐月採購，共得100隻雌性及146隻雄性赤腹松鼠。由分析15隻懷孕雌鼠，得知其排卵數為 2.07±0.26，著床前
  與著床後死亡率分別為 6.5%及6.9%，每胎個體數 1.8±0.56。雌松鼠一年中有兩個生殖旺季，為初春及夏季兩季，
  其懷孕率分別為 50%及26%。69隻成熟雌鼠中，單產者佔71%，可能部份雌松鼠一生或僅參與一次生殖。不成熟和成
  熟的雄鼠各佔31%及69%，和雌鼠相仿。睪丸指數分佈曲線呈雙?型，兩?距寬（0.6－8.0）且頻度極低，意味轉變迅
  速，為轉變型，兩?值分別為 0.4及10.0，前者屬幼鼠型，後者為功能型。睪丸指數 1～8 月維持在8.0以上，3及6
  月居巔?，4、5月稍降，9至11月急降至下限，12月旋回升。四種副性腺性腺指數的月變化，與睪丸指數的變化相符
  。
  由前述雌、雄生殖週期及不成熟松鼠出現頻度顯示，坪林地區赤腹松鼠，一年可能有兩次性成熟的轉換，初春出生
  松鼠於夏一秋季發育至成熟前期，冬末春初成熟，另一次夏季出生者，於隔年春天進入成熟前期，夏季成熟。e
• 英文摘要： The reproductive biology of the red-bellied tree squirrel, Callosciurus erythraeus, was studied mor-phometrically and histologically. Conclusions were drawn based on 246 squirrels (100 , 146 o) collect-ed at Ping-Lin, Taipei Hsien, from December, 1978 through February, 1980. The female had two activereproductive periods, January to March and June to August. The pregnancy rate in spring (50%) was muchhigher than that in summer (26%). The ovulation rate, preimplantation loss, postimplantation mortalityand litter size were analyzed from 15 pregnant females. The spring breeders produced more young than thesummer breeders. The gonadosomatic index (GSI) was a reliable indicator for the reproductive state of themale. Cyclic changes in GSI were observed in the mature male but not in the immature. The mature malesquirrels had two peaks of GSI values in March and June, respectively. Cyclic changes in the weights of theepididymis, seminal vesicle, prostate gland, and Cowper's gland were comparable to those in the testes. Theadult male was sexually quiescent from September through November. The red-bellied tree squirrel reachedits sexual maturity at the age of about one year. The spring litters grew faster and larger than the summerones.
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