Conception rate following timed artificial insemination protocols in dairy heifers synchronised by PGF(2 alpha) and GnRH

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dc.contributor.authorTaşdemir, Umut
dc.contributor.authorÇelik, Yakup
dc.contributor.authorGüzeloǧlu, Aydın
dc.contributor.buuauthorMecitoğlu, Gülnaz Yılmazbaş
dc.contributor.buuauthorKeskin, Abdülkadir
dc.contributor.buuauthorBilen, Ebru Karakaya
dc.contributor.buuauthorGümen, Ahmet
dc.contributor.departmentUludağ Üniversitesi/Veterinerlik Fakültesi/Kadın Hastalıkları ve Doğum Anabilim Dalı.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.scopusid36457964000tr_TR
dc.contributor.scopusid24473229800tr_TR
dc.contributor.scopusid36457784500tr_TR
dc.contributor.scopusid6602393069tr_TR
dc.date.accessioned2022-11-07T12:24:46Z
dc.date.available2022-11-07T12:24:46Z
dc.date.issued2011
dc.description.abstractThis study aimed to develop a timed artificial insemination (TAI) protocol using PGF(2 alpha) and GnRH with acceptable pregnancy rate in dairy heifers. Dairy heifers (n=290), aged between 13 and 26 months (mean 16.1 months), were used in this study. Heifers were synchronized with two PGF(2 alpha) administrations by 14 d intervals. After the second PGF(2 alpha), heifers were randomly assigned into two groups. In Group 1 (n=155), GnRH was given at 56h following 2nd PGF(2 alpha) and TAI was performed at 16-18h after the GnRH. In Group 2 (n=135), GnRH was administered at 72h after 2nd PGF(2 alpha), at the time of TAI. Ultrasonography was performed at both PGF(2 alpha) administrations to determine cyclicity, at the time of TAI to measure ovulatory follicle size, 7 d after TAI to determine ovulation, 31 and 62 d post-AI to determine pregnancy. Ovulatory follicle size at the time of TAI was not significantly different between groups (12.8 +/- 1.6 mm and 13.2 +/- 1.8 mm in group 1 and 2, respectively). Synchronization rate was similar in group 1 (85.2%;132/155) and in group 2 (91.1%;123/135). Conception rate (CR) at 31 d was not different in group 1(59.8%;79/132) and in group 2 (55.3%;68/123). Embryonic loss (7.6%; 6/79 and 7.4%; 5/68 in group 1 and 2 respectively) was not different. Gender ratio of the calves was found different between groups. Proportion of the female calves born were higher (P=0.03) in group 1 (63.3%; 38/60) than in group 2 (42.0%; 21/50). In conclusion, both protocols can be used in order to eliminate estrous detection in large dairy herds. Although GnRH administration at the time of TAI was found to be useful to reduce handling of heifers, GnRH can be applied 16-18 h before Alto achive higher female calves ratio in large dairy farms.en_US
dc.identifier.citationTaşdemir, U. vd. (2011). ''Conception rate following timed artificial insemination protocols in dairy heifers synchronised by PGF(2 alpha) and GnRH''. Ankara Üniversitesi Veteriner Fakültesi Dergisi, 58(2), 135-139.tr_TR
dc.identifier.endpage139tr_TR
dc.identifier.issn1300-0861
dc.identifier.issn1308-2817
dc.identifier.issue2tr_TR
dc.identifier.scopus2-s2.0-78751619045tr_TR
dc.identifier.startpage135tr_TR
dc.identifier.urihttps://doi.org/10.1501/Vetfak_0000002463
dc.identifier.urihttp://vetjournal.ankara.edu.tr/tr/download/article-file/698547
dc.identifier.urihttp://vetjournal.ankara.edu.tr/tr/pub/issue/44731/555952
dc.identifier.urihttp://hdl.handle.net/11452/29414
dc.identifier.volume58tr_TR
dc.identifier.wos000307987600011tr_TR
dc.indexed.scopusScopusen_US
dc.indexed.trdizinTrDizintr_TR
dc.indexed.wosSCIEen_US
dc.language.isoenen_US
dc.publisherAnkara Üniversitesitr_TR
dc.relation.collaborationSanayitr_TR
dc.relation.collaborationYurt içitr_TR
dc.relation.journalAnkara Üniversitesi Veteriner Fakültesi Dergisitr_TR
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergitr_TR
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectVeterinary sciencesen_US
dc.subjectDairy heifersen_US
dc.subjectGnRHen_US
dc.subjectPGF(2 alpha)en_US
dc.subjectTimed artificial inseminationen_US
dc.subjectSynchronizationen_US
dc.subjectGonadotropin-releasing-hormoneen_US
dc.subjectSuckled beef-cowsen_US
dc.subjectEstrus-synchronizationen_US
dc.subjectPregnancy ratesen_US
dc.subjectEstrous cyclesen_US
dc.subjectFollicular dynamicsen_US
dc.subjectImprove fertilityen_US
dc.subjectSex-ratioen_US
dc.subjectOvulationaien_US
dc.subjectDüvetr_TR
dc.subjectSenkronizasyontr_TR
dc.subjectSuni tohumlamatr_TR
dc.subject.scopusArtificial Insemination; Estrus; Cattleen_US
dc.subject.wosVeterinary sciencesen_US
dc.titleConception rate following timed artificial insemination protocols in dairy heifers synchronised by PGF(2 alpha) and GnRHen_US
dc.title.alternativePGF2α ve GnRH kullanılarak senkronize edilen düvelerde zaman ayarlı suni tohumlama sonrasında elde edilen gebelik oranlarıtr_TR
dc.typeArticle
dc.wos.quartileQ4en_US

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