SINCRONIZAÇÃO DE ESTRO COM PROSTAGLANDINA F2α versus PROGESTÁGENO ASSOCIADO À GONADOTROFINA CORIÔNICA EQUINA (eCG) EM OVELHAS SANTA INÊS NO DISTRITO FEDERAL, BRASIL

Ciência Animal Brasileira. 2010;11(2):417-424

 

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Journal Title: Ciência Animal Brasileira

ISSN: 1518-2797 (Print); 1809-6891 (Online)

Publisher: Universidade Federal de Goiás

Society/Institution: Universidade Federal de Goiás, Escola de Veterinária

LCC Subject Category: Agriculture: Animal culture

Country of publisher: Brazil

Language of fulltext: Portuguese, English

Full-text formats available: PDF, HTML

 

AUTHORS

Bianca Damiani Marques Silva
Roberto Sartori
Thiago Antonio de Souza Nascimento Silva
Déborah Mendes Máximo Cardozo
Marcos Antonio Lemos de Oliveira
Jairo Pereira Neves

EDITORIAL INFORMATION

Peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 18 weeks

 

Abstract | Full Text

The aim of this study was to compare two protocols ofestrus synchronization in Santa Inês ewes. Thirty-eight ewes wererandomly divided into two groups of estrus synchronization: protocolPGF2α (two doses of 0.530 mg of PGF2α, nine days apart)and protocol MAP+eCG (intravaginal sponge impregnated withmedroxyprogesterone acetate, for 12 days, and then an injectionof 250 IU of eCG). The experiment was in a cross-over design,two estrous cycles apart. On the final day of protocol, a transrectalultrasound examination was carried out to measure the size of thelargest and second largest ovarian follicles and on day 7 of estrouscycle 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 andsecond largest ovarian follicles, interval between the end of theprotocol to estrus and ovulation rate did not differ between protocols.Ewes synchronized with MAP+eCG had greater serumP4 concentrations than ewes synchronized with PGF2α (3.9 and2.8 ng/mL, respectively, P<0.05). Based on the results, it may beconcluded that, although the protocol MAP+eCG was superior ininducing higher serum concentration of P4, the protocol PGF2αwas equivalent regarding estrus synchronization.