ハタネズミ(Microtus montebelli)の排卵様式
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概要
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The present study was undertaken to determine the pattern of ovulation (spontaneous or coitus induced) in <I>Microtus montebelli</I>.<BR>1) Ovulation was observed with a percentage of 73.3 (11/29 heads) in mated females as compared with 6.9% (2/29 heads) in unmated ones. From the above results and the histological observations on their ovaries, it seemed that <I>M. montebelli</I> was an induced ovulator.<BR>2) On the times of developmental stage of ova, 1-cell stage was at 9 hours after estimated time of ovulation, 2-cell at 33-34 hours, 4-cell at 36-38 hours, 8-12-cell at 57-59 hours and blastocyst at 80-82 hours, respectively.<BR>3) In the investigation of developmental stage of ova, it was observed that some females did not ovulate after coitus (4/15 heads) and had many abnormal ova (7/11 heads) . Therefore, it was suggested that the above fact was an obstacle to planned reproduction under the room condition.
- 日本哺乳類学会の論文