ESTRUS SYNCHRONIZATION WITH PROSTAGLANDIN F2? COMPARED TO PROGESTOGEN TREATMENT ASSOCIATED WITH EQUINE CHORIONIC GONADOTROPIN (eCG) IN SANTA INÊS BREED EWES REARED IN FEDERAL DISTRICT, BRAZIL
DOI:
https://doi.org/10.5216/cab.v11i2.4284Keywords:
Animal ReproductionAbstract
The aim of this study was to compare two protocols of estrus synchronization in Santa Inês ewes. Thirty-eight ewes were randomly divided into two groups of estrus synchronization: protocol PGF2? (two doses of 0.530 mg of PGF2?, nine days apart) and protocol MAP+eCG (intravaginal sponge impregnated with medroxyprogesterone acetate, for 12 days, and then an injection of 250 IU of eCG). The experiment was in a cross-over design, two estrous cycles apart. On the final day of protocol, a transrectal ultrasound examination was carried out to measure the size of the largest and second largest ovarian follicles and on day 7 of estrous cycle blood was collected to measure serum P4 concentration. Laparoscopy was carried out on day 11 after the end of protocols to count corpora lutea. Synchronization rate, size of largest and second largest ovarian follicles, interval between the end of the protocol to estrus and ovulation rate did not differ between protocols. Ewes synchronized with MAP+eCG had greater serum P4 concentrations than ewes synchronized with PGF2? (3.9 and 2.8 ng/mL, respectively, P<0.05). Based on the results, it may be concluded that, although the protocol MAP+eCG was superior in inducing higher serum concentration of P4, the protocol PGF2? was equivalent regarding estrus synchronization.KEYWORDS: Follicle size, serum progesterone, sheep, synchronization rate.
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Published
2010-06-23
How to Cite
SILVA, B. D. M.; SARTORI, R.; SILVA, T. A. de S. N.; CARDOZO, D. M. M.; OLIVEIRA, M. A. L. de; NEVES, J. P. ESTRUS SYNCHRONIZATION WITH PROSTAGLANDIN F2? COMPARED TO PROGESTOGEN TREATMENT ASSOCIATED WITH EQUINE CHORIONIC GONADOTROPIN (eCG) IN SANTA INÊS BREED EWES REARED IN FEDERAL DISTRICT, BRAZIL. Brazilian Animal Science/ Ciência Animal Brasileira, Goiânia, v. 11, n. 2, p. 417–424, 2010. DOI: 10.5216/cab.v11i2.4284. Disponível em: https://revistas.ufg.br/vet/article/view/4284. Acesso em: 25 nov. 2024.
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Veterinary Medicine
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