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Follicular dynamics in Mangalarga mares.
Abstract: Ovarian follicular activity was studied by ultrasonography during 17 oestrous cycles in 9 Mangalarga mares during the second half of the ovulatory season. Sixteen oestrous cycles were considered normal and one 3-wave cycle showing a prolonged luteal phase was considered atypical. Daily ultrasonographic examinations were performed and the compiled data on follicular dynamics were studied retrospectively. One major wave of follicular growth was observed in 13 of the 16 normal cycles (81.25%), whereas 2 major waves occurred in 3 cycles (18.75%). The mean (+/- s.d.) days of emergence of the primary wave of follicular development in cycles containing one or 2 waves were Day 6.0 +/- 2.3 and Day 11.0 +/- 1.0, respectively. The secondary wave of follicular development in 2-wave cycles emerged on Day 0.0 +/- 3.6. The day of wave divergence for primary waves of follicular development in cycles which exhibited one or 2 major waves were Day 12.2 +/- 3.5 and Day 17.3 +/- 3.0, respectively. Divergence of secondary waves occurred in only one of the 3 cycles which exhibited 2 major follicular waves (Day 7). The mean (+/- s.d.) maximum diameters of the dominant follicle in the primary wave of oestrous cycles exhibiting one and 2 major waves were 39.0 +/- 3.9 mm and 34.7 +/- 2.5 mm, respectively. The mean (+/- s.d.) maximum diameter of the dominant follicle present in the secondary wave was 34.3 +/- 11.0 mm. The mean (+/- s.d.) lengths of the interovulatory intervals for cycles containing one and 2 major waves were 19.4 +/- 2.2 and 23.3 +/- 2.5 days, respectively. These data indicate that most Mangalarga mares show one major follicular wave during the oestrous cycle but a small percentage of mares show 2 major waves.
Publication Date: 1998-05-21 PubMed ID: 9593519DOI: 10.1111/j.2042-3306.1997.tb05091.xGoogle 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
- Research Support
- Non-U.S. Gov't
Summary
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The study focuses on observing ovarian follicular activity in Mangalarga mares during the second half of the ovulatory season. The results indicate that most Mangalarga mares exhibit one major follicular wave during the oestrus cycle, but a small percentage show two major waves.
Objective and Methodology
- The researchers aimed to scrutinize the follicular dynamics in Mangalarga mares, with the aid of ultrasonography.
- The study encompassed 17 oestrous cycles of 9 Mangalarga mares over the latter half of the ovulatory season.
- A daily ultrasonography examination was executed, followed by a retrospective analysis of compiled follicular dynamics data.
- Of the 17 cycles analyzed, 16 were regarded as normal while one encompassing a 3-wave cycle with a prolonged luteal phase was considered atypical.
Findings
- In the majority (81.25%) of the normal cycles, specifically 13 out of 16, one major wave of follicular growth was observed. In contrast, the other 3 cycles (18.75%) exhibited two major waves.
- The emergence of the primary wave of follicular development in cycles containing either one or two waves was on average on Day 6.0 +/- 2.3 and Day 11.0 +/- 1.0, respectively.
- In 2-wave cycles, the secondary wave of follicular development emerged on Day 0.0 +/- 3.6.
- The divergence of primary waves in cycles showing one or two major waves was observed on average on Day 12.2 +/- 3.5 and Day 17.3 +/- 3.0, respectively.
- Divergence of secondary waves occurred in one of the three 2-wave cycles, on Day 7.
- The average maximum diameters of the dominant follicle in the primary wave for one and two major wave cycles were 39.0 +/- 3.9 mm and 34.7 +/- 2.5 mm, respectively. The dominant follicle in the secondary wave had an average maximum diameter of 34.3 +/- 11.0 mm.
- The average lengths of the interovulatory intervals for one and two major wave cycles were 19.4 +/- 2.2 days and 23.3 +/- 2.5 days, respectively.
Conclusion
- The data implies that most Mangalarga mares exhibit a single major follicular wave during the oestrus cycle.
- However, a minor percentage of mares exhibit two significant follicular waves.
Cite This Article
APA
Buratini J, Rosa e Silva AA, Barros CM, Papa FO, Caldas MC, Meira C.
(1998).
Follicular dynamics in Mangalarga mares.
Equine Vet J Suppl(25), 7-11.
https://doi.org/10.1111/j.2042-3306.1997.tb05091.x Publication
Researcher Affiliations
- Department of Animal Reproduction and Veterinary Radiology FMVZ-UNESP, Botucatu S.P., Brazil.
MeSH Terms
- Animals
- Brazil
- Estrus / physiology
- Female
- Horses / physiology
- Luteinizing Hormone / blood
- Luteinizing Hormone / metabolism
- Ovarian Follicle / diagnostic imaging
- Ovarian Follicle / physiology
- Progesterone / blood
- Progesterone / metabolism
- Retrospective Studies
- Seasons
- Ultrasonography
Citations
This article has been cited 1 times.- Zeitoun MM, Derar DR, Ali A, Alharbi YM. Expression of Hormones, Cytokines, and Antioxidants in Heat-Stressed Subfertile Female Dromedaries. Animals (Basel) 2022 Aug 19;12(16).
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