Follicular growth and timing of ovulation after coitus in the Japanese hare, Lepus brachyurus brachyurus.

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  • YAMADA Fumio
    <I>Kansai Research Center, Forestry and Forest Products Research Institute</I>
  • SHIRAISHI Satoshi
    <I>Zoological Laboratory, Faculty of Agriculture, Kyushu University</I>
  • TANIGUCHI Akira
    <I>Kagoshima Prefecture Forest Experiment Station</I>
  • MORI Takayuki
    <I>Zoological Laboratory, Faculty of Agriculture, Kyushu University</I>
  • UCHIDA Teru Aki
    <I>Zoological Laboratory, Faculty of Agriculture, Kyushu University</I>

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タイトル別名
  • Follicular Growth and Timing of Ovulati

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説明

Reproductive organs of 3 unmated female hares and 4 mated ones, which were killed at 10 hr (1 hare), 12 hr (1 hare) and 15 hr (2 hares) after copulation, were investigated histologically with a light microscope to determine the process of follicular growth and the timing of reflex (induced) ovulation in Lepus brachyurus brachyurus. The vesicular follicles observed in the hare belong to the‘spider’type characteristic of the order Lagomorpha. After copulation, the vesicular follicles rapidly increased in size (the greatest length 1.0-1.3 mm) and became the mature follicles (1.5-2.5 mm) . Such follicular growth and maturation in the hare were similar to those of the domestic rabbit. Although an ovum just after extrusion of the first polar body was recognized in a mature follicle, the details of ovulated eggs remained unknown because of preparation failures. The time required for the hare to ovulate after copulation was between 12-15 hr, and it closely approximated to the times required for other genera (Oryctolagus and Sylvilagus) examined so far in the Leporidae.

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