Induction of Twinning in Cattle by Ipsilateral Transfer of Fresh or Frozen <I>in vitro</I> Fertilized Embryos

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  • 体外受精凍結胚2個の移植による牛双子生産
  • タイガイ ジュセイ トウケツ ハイ 2コ ノ イショク ニ ヨル ウシ フタゴ
  • Induction of Twinning in Cattle by Ipsilateral Transfer of Fresh or Frozen in vitro Fertilized Embryos

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Abstract

Two each of fresh embryos collected by flushing after superovulation from 10 Japanese black cows were ipsilaterally and nonsurgically transferred into the uterus of 44 recipient Holstein cows. Twenty-six recipients (59%) became pregnant producing 10 (38%) twin calves, but abortion occurred in 2 (8%) cases. Two each of frozen embryos prepared by in vitro fertilization were transferred with the same manner into 402 recipient Holstein cows. Onehundred forty recipients (35%) became pregnant producing 17 (12%) twin calves, but abortion occurred in 14 (10%) cases. No significant difference was observed in the gestation period and the weight of calves between the two groups. Thirty-four calves were produced from the transfer of fresh embryos on 26 recipients and 143 calves were produced from transfer of frozen embryos on 140 recipients.

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