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Reproductive efficiency of intensively managed Thoroughbred mares in Newmarket.
Abstract: The findings of a retrospective survey of 1393 Thoroughbred mares visiting 22 studfarms in the Newmarket region of the UK during the 1998 mating season were compared with those of a similar study undertaken in 1983. The effects of mare age and status, stallion, month of mating, application of uterine treatments and other parameters on the rates of singleton and twin conception and subsequent pregnancy losses were analysed. Mare age and status significantly affected the per cycle pregnancy rate and the incidence of pregnancy loss. Overall, the mean number of matings per oestrus was 1.12 and the mean number of times a mare was mated until diagnosed pregnant at 15 days after ovulation was 1.88. An overall mean per cycle pregnancy rate of 59.9% at 15 days after ovulation resulted in 94.8% of the mated mares being pregnant at least once at 15 days after ovulation. This high initial pregnancy rate fell to 89.7% by Day 35 and 87.5% by the time of the October pregnancy test; 82.7% of the mares surveyed gave birth to a live foal at term, which compares favourably with the proportion of mares foaling in 1983 (77%). However, despite improvements in the foaling rates over the last 15 years, the overall rate of pregnancy failure remains high and represents a major loss to the Thoroughbred breeding industry.
Publication Date: 2002-02-02 PubMed ID: 11822372DOI: 10.2746/042516402776181222Google Scholar: Lookup The Equine Research Bank provides access to a large database of publicly available scientific literature. Inclusion in the Research Bank does not imply endorsement of study methods or findings by Mad Barn.
- Journal Article
- Research Support
- Non-U.S. Gov't
Summary
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The study examines the reproductive efficiency of Thoroughbred mares managed intensively in Newmarket, highlighting various factors that contribute to the rates of conception and birth, and comparing the results with a similar study from 1983.
Objective and Methodology
- In this research, the scientists carried out a retrospective survey on 1393 Thoroughbred mares across 22 stud farms in the Newmarket region of the UK. The results were then compared to a similar study carried out in 1983.
- The study took place during the 1998 mating season and primarily aimed at analyzing the effects of various parameters on singleton and twin conception rates as well as subsequent pregnancy losses. The parameters included the age of mares, status, the stallion, month of mating, application of uterine treatments, etc.
Key Findings
- The study found that age and status of the mares significantly affect the per cycle pregnancy rate and the incidence of pregnancy loss.
- The mean number of matings per oestrus was found to be 1.12 and the mean number of times a mare was mated until diagnosed pregnant at 15 days after ovulation was 1.88.
- The study reported an overall mean per cycle pregnancy rate of 59.9% at 15 days after ovulation. This result indicated that 94.8% of the mated mares were pregnant at least once at 15 days after ovulation.
- However, this impressive initial pregnancy rate decreased to 89.7% by Day 35 and further to 87.5% by the time of the October pregnancy test.
- In the end, about 82.7% of the surveyed mares ended up giving birth to a live foal at term, which was an improvement compared to the 1983 study where only 77% of mares foaled.
Conclusion
- Despite the improvements made over the past 15 years, the study concluded that the overall rate of pregnancy failure is still high and represents a significant loss to the Thoroughbred breeding industry.
Cite This Article
APA
Morris LH, Allen WR.
(2002).
Reproductive efficiency of intensively managed Thoroughbred mares in Newmarket.
Equine Vet J, 34(1), 51-60.
https://doi.org/10.2746/042516402776181222 Publication
Researcher Affiliations
- Thoroughbred Breeders' Association Equine Fertility Unit, Mertoun Paddocks, Newmarket, Suffolk, UK.
MeSH Terms
- Age Factors
- Animal Husbandry / methods
- Animals
- Breeding
- Female
- Fertility
- Horses / physiology
- Male
- Pregnancy
- Pregnancy Outcome / veterinary
- Pregnancy Rate
- Pregnancy, Animal / physiology
- Pregnancy, Multiple
- Reproduction
- Retrospective Studies
Citations
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