- Performance mares can produce foals from as young as two years old while continuing their performance career.
- Enables production of foals from older or unsound mares or mares with a history of pregnancy loss (resorption or abortion). In reality, these mares may not be ideal donors, as embryo recovery can be as low as 20% per cycle especially in agedmares. The quality of the unfertilized egg determines the quality of the embryo. As with any female mammal the percentage of less viable eggs increases with age.
- If a mare foals late in the season (e.g. January or February), embryo transfer can be used to produce a foal in the current season using a recipient and enable the mare to start early in the following season.
- Allows production of more than one foal per mare per year. It is feasible for mares to produce several foals in a season, although some breed societies have restricted registered offspring to one per mare per season.
Embryo Transfer
Embryo transfer is becoming increasingly popular as a tool in equine reproduction and this technique is routinely used at our Equine Breeding Centre with considerable success.
Advantages of Embryo Transfer Techniques
Results
If the donor mare is reasonably fertile & the semen from the stallion is of good quality, you can expect:
- At least 75% of normal donor mares to with fair to good semen to conceive.
- Embryo recovery to be successful in around 75% of cases.
- Assuming an embryo is recovered, transfer to the recipient should be successful in approximately 80% of cases.
Embryos are not guaranteed with every flush. The international standard success rate is two cycles per embryo retrieved in reproductively normal mares given good semen. Of course, some mares occasionally or consistently have double ovulations that occur at the same time and these cycles can produce two embryos per flush.
NB. Embryo recovery rates depend on the fertility of the mare and the quality of semen.
The Procedure
To achieve a successful transfer the donor mare must be synchronised with a suitable recipient mare that is synchronised to ovulate at a specific time after the donor. This requires synchronisation of several recipients to ensure that at least one will be suitable. Equivet Breeding Centre keeps a herd of recipient mares for this purpose. The recipient mare is then leased to the client until the foal is weaned. (A refund is paid on her return in suitable condition.)
The donor mare is scanned to determine the optimum time of service and can then be served naturally or inseminated with fresh, chilled or frozen semen. Fertilisation should occur and the fertilised egg will remain in the oviduct for six (6) days before descending into the uterus. It can then be flushed from the uterus (usually day 7-8) and transferred immediately into the recipient. The recipient mare can be examined by ultrasound for pregnancy on day 14 (seven days after transfer). (Note: At the time of flushing at 7 days it is too early to determine whether the donor mare has conceived.)
Embryo Transfers in Early September
Routinely, embryo transfer procedures are offered from the end of September as this allows a large number of recipient mares to be cycling properly. Clients requiring embryo transfer in early September should contact the office by mid June as the most forward recipients will need to be placed under an artificial lighting regime along with an increased rising plane of nutrition. The donor mare will also need to be placed under lights too and this treatment will need to start by mid-June. The donor mare can be placed under the appropriate lighting regime at the owner’s address until late August. We try very hard to keep the costs down for this procedure, but an additional charge is applied to donor mares requiring ET in early September. If you are interested, please contact the office on 07 4691 0322 or email us (enquiries@equivetausralia.com) by mid-June so that we can arrange an appropriate regime.
Bookings for Embryo Transfer
Bookings must be made early in the season.
The Lease Fee for the recipient mare entitles you to take the mare home and keep her until the foal is weaned. A portion of the lease fee is refundable when the mare is returned to the Equine Breeding Centre, however she must be in similar body condition and in normal reproductive health. If the recipient mare is not returned a suitable replacement mare (under 10 years of age, easy to catch and in good reproductive health and body condition) may be substituted by the owner of the donor mare OR the bond may not be refunded.
Agistment Fees
For practical reasons, embryo transfers are only done at the Equine Breeding Centre and the recipient should remain there until at least twenty-eight (28) days in foal. Please note you will be required to pay agistment for the recipient mare also, regardless of whether it is owned by you or the Equine Breeding Centre. Agistment charges for recipient mares owned by the Equine Breeding Centre commence from the time an embryo is recovered and transferred into the synchronised recipient.
A deposit is required when the mare is admitted to the Equine Breeding Centre.
PRICING INFORMATION - Please
contact the Equivet office
