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Embryo transfer in competition horses: Managing mares and expectations
1Department of Production and Population Health, The Royal Veterinary College North Mymms, Hertfordshire, UK.
Embryo transfer (ET) in competition mares may be hindered by exercise, heat, and hormonal treatments. Optimizing embryo recovery may require reduced exercise and minimal hormonal intervention.
Area of Science:
- Veterinary Science
- Reproductive Biology
- Equine Reproduction
Background:
- Embryo transfer (ET) allows competition mares to produce foals without career interruption.
- Potential negative impacts of heat, exercise, repeated flushing, and hormonal manipulation on equine fertility may be underestimated.
Purpose of the Study:
- To review evidence on factors affecting embryo recovery in non-geriatric competition mares.
- To identify strategies for optimizing embryo recovery rates in mares undergoing ET.
Main Methods:
- Literature review of factors influencing equine embryo recovery.
- Analysis of evidence linking environmental and managemental factors to fertility in competition mares.
Main Results:
- Repeated embryo flushing and exogenous hormone use can negatively impact fertility.
- Cessation of exercise during critical reproductive periods may improve embryo recovery.
Conclusions:
- Careful management of flushing-induced endometritis and minimal hormonal manipulation are crucial.
- Veterinarians must educate owners on factors affecting ET success and manage expectations regarding training disruptions.
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