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Non-surgical embryo collection in the mare and subsequent fertility of donor animals

M. Tischner and A. Bielaski

Summary. Observations were made on 14 mares which were non-surgically flushed on one or more occasions for recovery of embryos on Days 7–9 after ovulation. Flushing alone shortened the oestrous cycle by about 2·7 days but increased the number of mares failing to ovulate. Flushing followed by an injection of a prostaglandin analogue shortened the cycle by about 4·5 days and hence increased the frequency of ovulations. From a total of 70 flushings performed, 27 embryos were recovered and of 12 mares inseminated during the first oestrus after embryo collection, 6 conceived and foaled. The other 7 mares were used again as donors during the next season. They underwent a total of 21 non-surgical embryo collections and yielded 15 embryos. It is concluded that non-surgical embryo recovery and transfer provides a practical means of increasing the fecundity of valuable donor mares without depressing their fertility.