Abstract

PAREDES, M. P; JIMENEZ, C  and  HERNANDEZ, A. STUDY OF THE INTEROVULATORY INTERVAL IN COLOMBIAN CRIOLLO MARES. Rev. Med. Vet. Zoot. [online]. 2012, vol.59, n.1, pp.32-48. ISSN 0120-2952.

This study aims to contribute in the generation of reference values in Colombian Criollo (CC) mares, 30 animals were used to characterize their estrous cycles (EC). EC duration was 21.5 ± 1.8 days (mean ± SD). 40% of mares had the same duration in days for the two cycles observed and in the remaining 60% the difference in EC duration ranged from 1 to 7 days. The daily growth rate of the dominant follicle (DF) was 1.62 ± 0.4 mm and for the subordinate follicle (SF) was 0.65 ± 0.4 mm. Follicular deviation occurred on day 17.2 ± 3.0. The maximum size of DF was 44.3 ± 4.8 mm. In 63% of the observed EC, the DF was located in the right ovary and 37% in the left. In 85% of the studied EC, uterine edema preceded heat signs. The degree of edema decreased before ovulation in 86.6% of the studied EC. The average estrus duration was 5.9 ± 1.8 days. Most mares (73.3%) maintained heat signs up to 48 hours after ovulation. The values obtained showed that the reproductive parameters in CC mares are somewhat different from those described for different genotypes in other countries; these differences should be taken into account on routine clinical practices in the reproduction of the CC mares.

Keywords : estrous cycle; follicular growth; uterine edema; Colombian criollo mares.

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