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頁籤選單縮合
| 題 名 | Annual Reproductive Cycle of the Formosan Wood Mouse, Apodemus Semotus=臺灣森鼠之生殖周期 |
|---|---|
| 作 者 | 黃步敏; 林良恭; | 書刊名 | 動物研究學刊 |
| 卷 期 | 36:1 1997.01[民86.01] |
| 頁 次 | 頁17-25 |
| 分類號 | 389.6 |
| 關鍵詞 | 臺灣森鼠; 生殖; 小老鼠; 生殖腺; 雙峰型; Rodent; Reproduction; Bimodal; Gonad; Apodemus; |
| 語 文 | 英文(English) |
| 中文摘要 | 本研究在探討臺灣森鼠各月份生殖之表現,按月於臺灣中部合歡山地區(北緯24度)海拔約2300公尺處,以捕鼠器採集臺灣森鼠樣本。採樣期間自民國73年10月起至75年3 月止。有效之臺灣森鼠樣本共267隻,雄性森鼠之生殖腺重量在4月-5月份及9月-10月份間達到最高峰。相反的,在6月-7月份及12-2月份間生殖腺重量明顯下降,雌性森鼠的卵巢重量在4月及9月份亦達到最高峰,雌性森鼠的懷孕及泌乳現象在4月-5月份及8月-12月份間均被發現。23隻懷孕雌鼠之平均胎兒數為3.83 ± 0.8隻(2-6隻),平均排卵率(4.24 ± 0.22個)及平均胎兒數之差異顯現臺灣森鼠胎兒出生前之死亡率為12.8%。其中包含7.5%著床前死亡率及5.3%著床後死亡率。雌性森鼠子宮內不曾發現二組以上之胎痕。在年齡結構及幼鼠出現時間的分析上,更顯示出臺灣森鼠具有雙峰型之年生殖周期型態。在環境因子及天候的探討上,年溫度變化與臺灣森鼠雙峰型之年生殖周期具有較密切的關係。 |
| 英文摘要 | The annual reproductive pattern of Apodemus semotus was studied. A. semotus specimens were trapped at monthly intervals from October 1984 through March 1986 at about 2 300 m elevation in the Hohuanshan area of central Taiwan(24° latitude) .Reproductive parameters of 267 mice were measured. Seasonal changes in weights of male gonads showed peaks in April-May and September-October, whereas gonadal weights were sharply reduced and there was histological evidence of regression in june-july and December-February. Ovarian monthly mean weights also showed 2 peaks in April and September. Pregnant or lactating females were found in April-May and August-December. Breeding was more frequent in autumn than in spring. The mean litter size of 23 pregnant mice was 3.83 ± 0.88 (range 2-6). The difference between litter size and ovulation rate(4.24 ± 0.22) indicates that prenatal mortality was 12.8%, including 7.5% pre-implantation mortality and 5.3% post-implantation mortality. No more than 2 sets of placental scars were found in any individual. Analyses of age structure and the time of appearance of juveniles give further evidence of a bimodal annual reproductive pattern for A. semotus. |
本系統中英文摘要資訊取自各篇刊載內容。