埼玉県桶川市におけるハタネズミの繁殖活動
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概要
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Eleven hundred and thirty-nine voles (<I>Microtus montebelli</I>) were collected in a pasture at Okegawa City in Saitama Prefecture, during October 1975 to March 1977, and reproductive activity was investigated. In the sex ratio, females were always higher than males except for January and April in 1976. The testicle size was maintained over 10mm from spring to fall, but reduced in winter. Pregnancy rate holded over forty percent from spring to fall and generally declined in winter, but it was unexpectedly high in January, 1976. It was suggested that main breeding season may be in spring and fall by the result of examinations on pregnancy rate and embryo number, but this species has an ability to breed all the year round, because the breeding season is so changeable that the pregnant females are found in winter, too. The yearly embryo number was 4.5 in average.
- 日本哺乳類学会の論文
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- 埼玉県桶川市におけるハタネズミの繁殖活動