Abstract
The purposes of this experiment were 1) to test the hypothesis that placing rabbit embryos into the mare's uterus would hasten oviduct transport and 2) to determine if placing fluid into the uterus of bred mares on Day 4 and/or Day 5 would subsequently disrupt the mare's pregnancy. The hypothesis that placing rabbit embryos into the mare's uterus would hasten oviduct transport was not supported, since the uterine recovery rate of equine embryos on Day 5 was not significantly higher (P>0.05) for mares receiving rabbit embryos on Day 4 than for mares receiving no uterine infusion on Day 4 ( 1 10 vs 0 10 , respectively). However, placing fluid into the mare's uterus on Day 4 was apparently responsible for hastened oviduct transport, since mares with media infused into the uterus on Day 4 had a significantly higher (P<0.05) recovery rate of equine embryos on Day 5 than did mares receiving either rabbit embryos or no uterine infusion on Day 4 post ovulation ( 5 10 vs 1 10 or 0 10 , respectively). The Day-14 pregnancy rate was significantly higher (P<0.05) for mares receiving no uterine infusion on Day 4 or Day 5 than for mares receiving uterine infusion on Day 5 or uterine infusion on both Days 4 and 5 ( 9 10 vs 4 10 , 2 10 and 0 10 , respectively).
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