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Follicular dynamics in Mangalarga mares
J Buratini1, A A Rosa e Silva, C M Barros
1Department of Animal Reproduction and Veterinary Radiology FMVZ-UNESP, Botucatu S.P., Brazil.
Equine Veterinary Journal. Supplement
|May 21, 1998
Summary
Most Mangalarga mares exhibit one major follicular wave per oestrous cycle, though some display two. This study details ovarian follicular dynamics in mares during the ovulatory season.
Area of Science:
- Veterinary Medicine
- Reproductive Biology
- Equine Science
Background:
- Understanding ovarian follicular dynamics is crucial for equine reproduction.
- The Mangalarga breed's specific follicular wave patterns require detailed investigation.
Purpose of the Study:
- To ultrasonographically characterize ovarian follicular activity during the oestrous cycles of Mangalarga mares.
- To determine the prevalence of one versus two major follicular waves in this breed.
Main Methods:
- Daily ultrasonographic examinations were conducted over 17 oestrous cycles in 9 Mangalarga mares.
- Follicular dynamics, including wave emergence, divergence, and dominant follicle size, were analyzed retrospectively.
Main Results:
- 13 out of 16 normal cycles (81.25%) exhibited one major follicular wave; 3 cycles (18.75%) showed two major waves.
- Mean maximum dominant follicle diameters were 39.0 mm (one wave) and 34.7 mm (two waves).
- Interovulatory intervals averaged 19.4 days (one wave) and 23.3 days (two waves).
Conclusions:
- Mangalarga mares predominantly display a single major follicular wave during their oestrous cycle.
- A minority of mares exhibit two major follicular waves, influencing cycle length and dominant follicle characteristics.