ハタネズミにおける胎児数の変化

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  • 金子 之史
    Biological Laboratory, Faculty of Education, Kagawa University, Takamatsu, Japan

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タイトル別名
  • Variations of the Number of Embryos in <I>Microtus montebelli</I> (MILNE-EDWARDS)
  • ハタネズミ ニ オケル タイジスウ ノ ヘンカ エイブン

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抄録

The distribution of embryos in uterine horns, seasonal changes of body weight in pregnant females, and relation between the number of embryos, body size and age of pregnant females, micro-habitat and season were described in Microtus montebelli. Number of specimens, which were collected on rice field, rice field in fallow and young plantation, was 84. There was no statistically significant deviation from a random distribution of embryos within the uterus. The average body weight of pregnant females subtracting the weight of embryos was not significantly different during a year. The average number of embryos increased from class 6 to 8 and de-creased from class 9 to 11 in age-group of pregnant females. There was a tendency that the average body weight of pregnant females increased with the increase of the number of embryos at the same class in age-group. The number of embryos in the same weight of pregnant females on levees was larger in September than in May. A comparison between two neighboring October populations showed that the number of embryos in the same body weight was larger on rice field in fallow than in young plantation. It is suggested in this vole that the differences of food quality brought about the variation of the number of embryos of the same age and body size of pregnant females in different micro-habitats in the same season and/or in different seasons in the same micro-habitat.

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