Effect of hCG vs. GnRH at the beginning of the Ovsynch on first ovulation and conception rates in cyclic lactating dairy cows

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dc.contributor.authorDarıcı, R.
dc.contributor.authorOkut, Hayrettin
dc.contributor.buuauthorKeskin, Abdülkadir
dc.contributor.buuauthorYılmazbaş Mecitoğlu, Gülnaz
dc.contributor.buuauthorGümen, Ahmet
dc.contributor.buuauthorKarakaya Bilen, Ebru
dc.contributor.departmentUludağ Üniversitesi/Veterinerlik Fakültesi/Klinik Bilimler Bölümü.tr_TR
dc.contributor.orcid0000-0003-2817-3221tr_TR
dc.contributor.researcheridAAH-3831-2021tr_TR
dc.contributor.researcheridAAH-1406-2021tr_TR
dc.contributor.researcheridAAG-4440-2019tr_TR
dc.contributor.scopusid24473229800tr_TR
dc.contributor.scopusid36457964000tr_TR
dc.contributor.scopusid6602393069tr_TR
dc.contributor.scopusid36457784500tr_TR
dc.date.accessioned2021-12-02T07:57:45Z
dc.date.available2021-12-02T07:57:45Z
dc.date.issued2010-09-01
dc.description.abstractOvulatory response to the first GnRH of Ovsynch is a very important factor for determining the outcome of a successful synchronization. The aim of the present study was to develop a protocol to increase the percentage of cows that ovulated in response to the first administration of Ovsynch. This study was designed to compare ovulation rates in response to GnRH or hCG at the beginning of Ovsynch and to evaluate the effects of this manipulation on pregnancy. Cows (n = 371) with corpus luteum (CL) and at least one follicle greater than 10 mm diameter size on either ovary were included in the study. Cows were divided into two groups. The Ovsynch protocol began with GnRH (10 mu g) in the GPO group (n = 161; GnRH-7d-PGF2 alpha-56h-GnRH-18h-AI), whereas in the HPG group, the first GnRH of the Ovsynch was replaced with 1500 IU hCG (n = 210; hCG-7d-PGF2 alpha-56h-GnRH-18h-AI). Ovarian ultrasonography was performed at the times of GnRH or hCG and of PGF2 alpha administration, at the time of artificial insemination (AI) and seven days after Al, to determine ovulation. Maximal follicle size at the beginning of the Ovsynch did not affect on response to the first GnRH/hCG treatment. Conception rate (31 d) was 0.6 times more likely to be higher (P < 0.001) in cows that responded to the first hormonal administration of Ovsynch than in those that did not respond (95% CI = 0.29-0.71). Conception rate was found to be different between the HPG (37.6%, 79/210) and the GPO groups (48.4%, 78/161). Thus, beginning of the Ovsynch protocol with hCG did not increase ovulation and conception rate in lactating dairy cows, suggesting that hCG is not a suitable replacement of the first GnRH of Ovsynch. However, our results do show that increasing the ovulation rate in response to the first hormonal administration of Ovsynch can have a significant effect on conception rate.en_US
dc.identifier.citationKeskin, A. vd. (2010). "Effect of hCG vs. GnRH at the beginning of the Ovsynch on first ovulation and conception rates in cyclic lactating dairy cows". Theriogenology, 74(4), 602-607.en_US
dc.identifier.endpage607tr_TR
dc.identifier.issn0093-691X
dc.identifier.issn1879-3231
dc.identifier.issue4tr_TR
dc.identifier.pubmed20494429tr_TR
dc.identifier.scopus2-s2.0-77955509071tr_TR
dc.identifier.startpage602tr_TR
dc.identifier.urihttps://doi.org/10.1016/j.theriogenology.2010.03.009
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0093691X1000169X
dc.identifier.urihttp://hdl.handle.net/11452/22945
dc.identifier.volume74tr_TR
dc.identifier.wos000281261600015tr_TR
dc.indexed.pubmedPubmeden_US
dc.indexed.scopusScopusen_US
dc.indexed.wosSCIEen_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.collaborationYurt içitr_TR
dc.relation.collaborationSanayitr_TR
dc.relation.journalTheriogenologyen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergitr_TR
dc.relation.tubitakTOVAG 107O227tr_TR
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectOvsynchen_US
dc.subjecthCGen_US
dc.subjectCowen_US
dc.subjectSynchronizationen_US
dc.subjectGonadotropin-releasing-hormoneen_US
dc.subjectTimed artificial-inseminationen_US
dc.subjectHuman chorionic-gonadotropinen_US
dc.subjectReproductive-performanceen_US
dc.subjectEstrus synchronizationen_US
dc.subjectHolstein heifersen_US
dc.subjectEstrous-cycleen_US
dc.subjectFollicle sizeen_US
dc.subjectFertilityen_US
dc.subjectPresynchronizationen_US
dc.subjectBosen_US
dc.subjectReproductive biologyen_US
dc.subjectVeterinary sciencesen_US
dc.subject.scopusArtificial Insemination; Estrus; Estrus Synchronizationen_US
dc.subject.wosReproductive biologyen_US
dc.subject.wosVeterinary sciencesen_US
dc.titleEffect of hCG vs. GnRH at the beginning of the Ovsynch on first ovulation and conception rates in cyclic lactating dairy cowsen_US
dc.typeArticle
dc.wos.quartileQ1 (Veterinary sciences)en_US
dc.wos.quartileQ3 (Reproductive biology)en_US

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