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Home / Equine Research Bank / Reprod Domest Anim / Cervix-Deep Rectal Temperature Differential on the Day of&#x...
Reproduction in domestic animals = Zuchthygiene2024; 59(9); e14716; doi: 10.1111/rda.14716

Cervix-Deep Rectal Temperature Differential on the Day of Ovulation is Correlated With Embryo Recovery Results in Mares.

Abstract: Variations in temperature throughout the reproductive tract have been noted in many species. A recent study found the cervix-rectum temperature differential (CR-TD) in cattle was related to fertility. The present study aimed to assess the CR-TD in mares around the time of ovulation and relate it to embryo recover. Over 52 cycles, mares were inseminated with a fertile stallion and embryo recovery was undertaken on Day 7 post ovulation. Further 10 control mares were not inseminated. Rectal and cervical temperatures were measured using a precision thermometer on four or five occasions: the day of deslorelin administration and insemination, the day before ovulation, the day of ovulation (Day 0), the day after ovulation and, for inseminated mares, before embryo recovery on Day 7. One-way ANOVA showed that the CR-TD was significantly lower on the day of ovulation in the 36 positive cycles, in which an embryo was recovered, versus the 16 in which the embryo flush was negative (0.21 ± 0.17 vs. 0.40 ± 0.09°C; p < 0.001). Control cycles showed equivalent CR-TD to positive (0.13 ± 0.22 vs. 0.21 ± 0.17°C; p = 0.196) but not negative cycles (0.13 ± 0.22 vs. 0.40 ± 0.09°C; p < 0.001). A positive embryo recovery was associated with lower CR-TDs from the time of insemination and deslorelin to the day after ovulation compared to the day of embryo flushing (RM ANOVA; p < 0.001; Pairwise comparisons; p ≤ 0.01, in all cases). Rectal or cervical temperatures per se showed no significant differences between positive, negative or control cycles at any time point. In conclusion, a thermoregulatory process occurs close to ovulation which results in a lower CR-TD in cycles that produced an embryo versus those which did not. Further characterisation of TDs within the reproductive tract of the mare would increase our understanding of the conditions required for optimum fertility.
© 2024 Wiley‐VCH GmbH. Published by John Wiley & Sons Ltd.
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Publication Date: 2024-08-31 PubMed ID: 39205476DOI: 10.1111/rda.14716Google Scholar: Lookup
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Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

This study explores the link between changes in body temperature around the cervix and rectum during ovulation and successful embryo recovery in horses. The researchers found a significant relationship, indicating that certain temperature changes could predict successful reproduction in mares.

Objectives and methods of the study

  • The study aimed to investigate the correlation between the cervix-rectum temperature differential (CR-TD) around the time of ovulation and successful embryo recovery.
  • The researchers used data from 52 cycles of mares which were inseminated, and 10 control mares which were not.
  • Rectal and cervical temperatures were taken at various stages: upon administration of deslorelin and insemination; the day before, on the day of, and the day after ovulation; and seven days post-ovulation (for inseminated mares).
  • The temperatures were measured using a precision thermometer and statistical techniques like ANOVA were used to analyze the results.

Main results of the study

  • The study found a significant lower CR-TD on the day of ovulation in the 36 cycles which ended with a successful embryo recovery, compared to the 16 in which it did not.
  • The control cycles (non-inseminated mares) showed similar CR-TD to the successful cycles but differed significantly from the unsuccessful ones.
  • Lower CR-TDs were associated with positive embryo recovery from the time of insemination and deslorelin administration to the day after ovulation, compared to the day of embryo flushing.
  • No significant differences were found between the rectal or cervical temperatures themselves for the successful, unsuccessful, and control cycles.

Conclusions and future directions

  • The findings suggest that changes in the CR-TD around the time of ovulation can indicate the likelihood of successful embryo recovery in mares.
  • It implies that a thermoregulatory process occurring around ovulation plays a part in the chances of successful reproduction.
  • The research suggests that further study is needed, particularly characterizing temperature differentials within the mare’s reproductive tract, to enhance understanding of the exact conditions needed for optimal fertility.

Cite This Article

APA
Funes J, Ismer A, Hoogewijs M, Wilsher S. (2024). Cervix-Deep Rectal Temperature Differential on the Day of Ovulation is Correlated With Embryo Recovery Results in Mares. Reprod Domest Anim, 59(9), e14716. https://doi.org/10.1111/rda.14716

Publication

Reproduction in domestic animals = Zuchthygiene
ISSN: 1439-0531
NlmUniqueID: 9015668
Country: Germany
Language: English
Volume: 59
Issue: 9
Pages: e14716

Researcher Affiliations

Funes, Javier
  • Sharjah Equine Hospital, Sharjah, UAE.
Ismer, Ann
  • Sharjah Equine Hospital, Sharjah, UAE.
Hoogewijs, Maarten
  • Sharjah Equine Hospital, Sharjah, UAE.
Wilsher, Sandra
  • Sharjah Equine Hospital, Sharjah, UAE.

MeSH Terms

  • Animals
  • Female
  • Horses / physiology
  • Ovulation / physiology
  • Cervix Uteri / physiology
  • Insemination, Artificial / veterinary
  • Rectum / physiology
  • Body Temperature
  • Pregnancy
  • Triptorelin Pamoate / administration & dosage
  • Triptorelin Pamoate / pharmacology
  • Triptorelin Pamoate / analogs & derivatives

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Citations

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