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Factors affecting side of ovulation in heifers and mares-A comparative study.
Abstract: Effect of side (left ovary, LO; right ovary, RO) and intraovarian presence of the regressing corpus luteum (CL) on the preovulatory follicle (PF) and ovulation were studied using ultrasonic- records of complete interovulatory intervals (IOI) for 500 IOI in heifers and 485 IOI in mares. Only IOI with a recording of side of a single PF and a single CL at each end of the IOI were used. In heifers, ovulation at the end of the IOI occurred more frequently (P < 0.0001) from RO (n = 285, 57%) than LO (n = 215, 43%). In mares, frequency of ovulation did not differ between RO (n = 250. 52%) and LO (n = 235, 48%). In heifers but not in mares, the number of predeviation follicles has been reported to be greater in RO than LO. In heifers, RO ovulation was more frequent when CL was in PF ovary (66%) than when CL was in opposite ovary (50%). There was no difference in side of ovulation (RO, 50%, LO, 50%). In mares, there were no significant main effects or interactions for frequency of ovulation involving side and intraovarian presence of the CL. On a species comparative basis, the present and reported results supported hypothesis 1 that a greater number of predeviation follicles in RO than in LO is associated with the predilection for RO ovulation. Results also supported hypothesis 2 that ovulation from RO in heifers is more frequent when RO contains the regressed CL than when the CL is in LO.
Copyright © 2018 Elsevier B.V. All rights reserved.
Publication Date: 2018-10-30 PubMed ID: 30447890DOI: 10.1016/j.anireprosci.2018.10.008Google 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.
- Comparative Study
- Journal Article
Summary
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The research article focuses on the factors affecting which ovary (right or left) is likely to release an egg during ovulation in heifers and mares. The study observes and compares the correlation between the location of the regressing corpus luteum (a temporary endocrine structure in mammals after ovulation) and pre-ovulatory follicles.
Methodology
- The researchers examined the ovulation patterns in 500 interovulatory intervals (IOIs) in heifers and 485 IOIs in mares using ultrasonography.
- Only those IOIs, where the location of a single pre-ovulatory follicle (PF) and a single corpus luteum (CL) could be recorded at each end of the IOI, were considered for this study.
Findings
- In heifers, it was found that ovulation occurred more from the right ovary (57%) than the left ovary (43%).
- Contrarily, in mares, ovulation occurred equally from right (52%) and left (48%) ovaries.
- The study also suggested that the right ovary in heifers has a greater number of predeviation follicles compared to the left. However, no such pattern was reported in mares.
- Furthermore, in heifers, ovulation was more frequent from the right ovary when the corpus luteum was present in the same ovary (66%) compared to when the corpus luteum was in the opposite ovary (50%).
- Interestingly, in mares, the location of the corpus luteum did not significantly affect the side of ovulation.
Conclusion
- Based on these observations, it can be deduced that the presence of a larger number of predeviation follicles in the right ovary is associated with the likelihood of right ovary ovulation. This phenomenon was observed in heifers but not in mares.
- Also, the study supports the hypothesis that heifers are more likely to ovulate from the right ovary, if the corpus luteum is also present in the same ovary.
- The findings from the research could have implications in understanding the ovulation process and fertility patterns in heifers and mares, potentially aiding in the development of reprogenetics strategies.
Cite This Article
APA
Ginther OJ, Dangudubiyyam SV.
(2018).
Factors affecting side of ovulation in heifers and mares-A comparative study.
Anim Reprod Sci, 199, 72-78.
https://doi.org/10.1016/j.anireprosci.2018.10.008 Publication
Researcher Affiliations
- Eutheria Foundation, Cross Plains, Wisconsin, 53528, USA; Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, Wisconsin, 53706, USA. Electronic address: oj.ginther@wisc.edu.
- Eutheria Foundation, Cross Plains, Wisconsin, 53528, USA.
MeSH Terms
- Animals
- Cattle / physiology
- Cells, Cultured
- Corpus Luteum / cytology
- Corpus Luteum / physiology
- Female
- Horses / physiology
- Ovarian Follicle / cytology
- Ovarian Follicle / physiology
- Ovulation
Citations
This article has been cited 1 times.- Jerez ERM, García AA, Caccia M, Rodríguez AC, Gonzales SJR, Waltero EMM, Marín DFD. Effect of the presence and location of corpus luteum on competence of bovine cumulus-oocyte complexes. Anim Reprod 2022;19(2):e20210074.
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