Fffect of Position in the Uterus on the Fetal Weight of 21th Day of Pregnancy in the Unilaterally Ovariectomized Rat

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  • KOZAKI Tsukasa
    <I>Laboratory of Animal Breeding, Department of Agriculture, Iwate University</I>
  • TAKAHASHI Jutaro
    <I>Laboratory of Animal Breeding, Department of Agriculture, Iwate University</I>
  • YASUDA Yasuhisa
    <I>Laboratory of Animal Breeding, Department of Agriculture, Iwate University</I>

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Other Title
  • 片側卵巣摘出ラットの胎児重量に対する子宮内位置効果
  • カタガワ ランソウ テキシュツ ラット ノ タイジ ジュウリョウ ニ タイスル

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Description

Effects of intrauterine position of the fetuses on the weight of fetal sac, fetus and placenta were investigated on the 21th day of unilaterally (right) ovariectomized pregnant Wistar strain rats. Results were obtained as follows. 1. Litter size was negatively correlated with the mean weights of fetal sac and fetus. 2. The mean weights of male fetal sac and fetus were heavier than those of female ones, while there was no difference in the weight of placenta between male and female. 3. The mean weights of male fetal sac and fetus positioning ovarian end (OV) were lighter than those of ones at the other positions. And the highest frequency of the lightest weight of live fetuses was demonstrated at OV position. 4. The mean weights of male fetal sac and fetus positioning between two males (2M) were heavier than those of ones positioning not next to male (0M) . And the mean weight of 2M female fetal sac was heavier than those of 0M one. 5. The mean weights of fetal sac and fetus positioning next to resorbed fetus were heavier than those of ones positioning not next to resorbed fetus.

Journal

  • Experimental Animals

    Experimental Animals 37 (1), 13-20, 1988

    Japanese Association for Laboratory Animal Science

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