Effect of repeated transvaginal ultrasound-guided follicle aspiration on fertility in mares.
Abstract: To determine whether performance of transvaginal ultrasound-guided follicle aspiration (TVUFA) repeatedly in mares adversely affects their fertility. Methods: Historical prospective study. Methods: 23 mares that had never undergone TVUFA and 59 mares that had undergone TVUFA on 1 to 11 occasions. Methods: Mares were classified into 4 groups according to the number of TVUFA procedures previously performed on the ovary in which ovulation occurred at the time of insemination as follows: group 1, 0 TVUFAs (control group, n = 23 mares); group 2, 1 or 2 TVUFAs (40 mare-cycles); group 3, 3 or 4 TVUFAs (21 mare-cycles); and group 4, 5 to 11 TVUFAs (13 mare-cycles). Each ovary and its associated number of TVUFAs were considered separately; therefore, some of the mares that underwent TVUFA were represented in > 1 group (1 mare was included in group 2 twice [once for each ovary]), and the sample size in groups 2, 3, and 4 was denoted as mare-cycles. Fertility was assessed as pregnancy rates in cycles in which mares were inseminated with fresh or cooled semen from 1 fertile stallion. Results: There were no significant differences in pregnancy rates among groups 1, 2, 3, and 4 (83%, 90%, 81%, and 85%, respectively). Conclusions: Results indicated that repeated performance of TVUFA (as many as 11 times) had no detectable adverse effect on fertility in mares. This finding is clinically important for situations when TVUFA is performed on fertile mares, whether for oocyte collection or other purposes.
Publication Date: 2006-01-24 PubMed ID: 16426200DOI: 10.2460/javma.228.2.248Google Scholar: Lookup
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- Journal Article
- Research Support
- Non-U.S. Gov't
Summary
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The research paper investigates whether repeated execution of transvaginal ultrasound-guided follicle aspiration (TVUFA) procedure decreases the fertility in mares, and concludes that repeated TVUFA does not noticeably impact the fertility in mares.
Study Methods
- The researchers conducted a historical prospective study involving two groups of mares i.e., those who had never experienced a TVUFA procedure, and those who underwent the procedure at various frequencies.
- A total of 23 mares that never underwent TVUFA and 59 mares that had undergone TVUFA between one and eleven times, were included in the study.
- The mares were categorized into four groups based on the number of TVUFA procedures they had.
- Group 1 consisted of those with 0 TVUFAs (control group comprised of 23 mares).
- Group 2 consisted of mares with 1 or 2 TVUFAs (which was 40 mare-cycles).
- Group 3 consisted of mares with 3 or 4 TVUFAs (which was 21 mare-cycles).
- Group 4 consisted of mares with 5 to 11 TVUFAs (which was 13 mare-cycles).
- Each ovary was processed separately, therefore some mares appeared in more than one group. Mares undergoing TVUFA were represented in more than one group.
Fertility Assessment
- Fertility was assessed by the pregnancy rates in the cycles where mares were inseminated with fresh or cooled semen from a fertile stallion.
Study Results
- The study didn’t provide significant differences in pregnancy rates among group 1, 2, 3, and 4. The pregnancy rates were 83%, 90%, 81%, and 85% respectively.
Study Conclusion
- The research suggests that repeated TVUFA procedures, even up to eleven times, show no appreciable adverse effect on the fertility in mares.
- This finding is crucial in clinical terms wherever TVUFA is performed on fertile mares, either for collecting oocytes or for any other purposes.
Cite This Article
APA
Vanderwall DK, Hyde KJ, Woods GL.
(2006).
Effect of repeated transvaginal ultrasound-guided follicle aspiration on fertility in mares.
J Am Vet Med Assoc, 228(2), 248-250.
https://doi.org/10.2460/javma.228.2.248 Publication
Researcher Affiliations
- Northwest Equine Reproduction Laboratory, Department of Animal and Veterinary Science and Center for Reproductive Biology, College of Agricultural and Life Sciences, University of Idaho, Moscow, ID 83844-2201, USA.
MeSH Terms
- Animals
- Female
- Fertility
- Horses / physiology
- Insemination, Artificial / veterinary
- Ovarian Follicle / physiology
- Pregnancy
- Pregnancy Rate
- Prospective Studies
- Ultrasonography / adverse effects
- Ultrasonography / veterinary
- Vagina / diagnostic imaging
Citations
This article has been cited 2 times.- Vanderwall DK, Baumann C, Viveiros M, Sertich PL, Kelleman AA, Maenhoudt C, Jacobson CC, De La Fuente R. Characterizing the meiotic spindle configuration and chromosome complement of in vivo matured equine oocytes. Anim Reprod Sci 2010;121(1-2 Suppl):234-236.
- Van den Branden E, Salamone M, Broothaers K, Peere S, Polfliet E, Dewulf M, Van Steenkiste G, van Loon G, Smits K, Govaere J. Physiological and behavioral parameters of pain and stress in mares during and after transvaginal ultrasound-guided follicular aspiration. Front Vet Sci 2025;12:1574351.
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