Synchronization of estrus in cows using double PGF2?, GnRH-PGF2? and hCG-PGF2? combination

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dc.contributor.authorÇoyan K.
dc.contributor.authorAtaman M.B.
dc.contributor.authorErdem H.
dc.contributor.authorKaya A.
dc.contributor.authorKasikci G.
dc.date.accessioned2020-03-26T16:46:40Z
dc.date.available2020-03-26T16:46:40Z
dc.date.issued2003
dc.departmentSelçuk Üniversitesien_US
dc.description.abstractThe aim of this study was to compare the effectiveness of treatments combining GnRH and PGF2? hCG and PGF2? combinations, and double PGF2? administration for synchronization of estrus in cows. This study was carried out in 30 Brown Swiss cows, aging 3 - 5 years. The cows were randomly divided into three groups. In group I (n = 10), the cows were treated with an intramuscular injection of 20 ?g GnRH (day = 0) at a random stage of the estrous cycle followed by intramuscular injection of 0.150 mg PGF2? 7 days later (day = 7). In group II (n = 10), the cows were treated with an intravenous injection of 3000 IU hCG (day = 0) at a random stage of the estrous cycle followed by intramuscular injection of 0.150 mg PGF2? 7 days later (day = 7). In group III (n = 10), the cows were received two injections of 0.150 mg PGF2? 11 day apart (day = 0, and 11). GnRH (10 ?g) was injected intramuscularly to the cows 48 hours after the injection of PGF2? in the groups I and II, and after the second PGF2? in group III. The cows were inseminated 12 hours after the GnRH injections. Blood samples were collected daily to determine plasma progesterone levels for 13 days in the groups I and II, and for 15 days in the group III starting from the day of GnRH, hCG and first PGF2? injections respectively. The mean interval injections-estrus, injections-ovulation, synchronization and pregnancy rates of the groups were determined. Plasma progesterone levels on day 0 and at estrous were similar among the three groups, but it was significantly higher (p < 0.01) in the groups I and II than in the group III on the day of PGF2? administration. The mean GnRH injections-estrus and injections-ovulation interval in the groups I, II and III were 52.2 ± 1.69, 48.4 ± 1.34 and 68.2 ± 1.31 hours; 70.4 ± 1.17, 67.3 ± 1.36 and 90.6 ± 2.15 hours, respectively and were significantly different (p < 0.01). The synchronization rates tend to be higher in the groups I and II (100%) than in the group III (80%), and pregnancy rates of the groups I, II and III were 60%, 60% and 30%, respectively. As a conclusion, application of a GnRH and hCG analogue prior to synchronization of estrus with an injection of PGF2? may provide better results than two injections of PGF2? for estms synchronization in cows.en_US
dc.identifier.endpage96en_US
dc.identifier.issn0035-1555en_US
dc.identifier.issue2en_US
dc.identifier.scopusqualityQ3en_US
dc.identifier.startpage91en_US
dc.identifier.urihttps://hdl.handle.net/20.500.12395/18707
dc.identifier.volume154en_US
dc.identifier.wosWOS:000182512700001en_US
dc.identifier.wosqualityQ4en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.relation.ispartofRevue de Medecine Veterinaireen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.selcuk20240510_oaigen_US
dc.subjectCowen_US
dc.subjectEstrus synchronizationen_US
dc.subjectGnRHen_US
dc.subjectHCGen_US
dc.subjectPGF2?en_US
dc.titleSynchronization of estrus in cows using double PGF2?, GnRH-PGF2? and hCG-PGF2? combinationen_US
dc.typeArticleen_US

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