Conception rate following timed artificial insemination protocols in dairy heifers synchronised by PGF2? and GnRH

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dc.contributor.authorTasdemir, Umut
dc.contributor.authorYilmazbas-Mecitoglu, Gulnaz
dc.contributor.authorKeskin, Abdulkadir
dc.contributor.authorKarakaya, Ebru
dc.contributor.authorCelik, Yakup
dc.contributor.authorGuzeloglu, Aydin
dc.contributor.authorGumen, Ahmet
dc.date.accessioned2020-03-26T18:14:01Z
dc.date.available2020-03-26T18:14:01Z
dc.date.issued2011
dc.departmentSelçuk Üniversitesi, Veteriner Fakültesi, Klinik Bilimler Bölümüen_US
dc.description.abstractThis study aimed to develop a timed artificial insemination (TAI) protocol using PGF2? 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.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [TOVAG 1070227]en_US
dc.description.sponsorshipThe authors thank TARFAS Co. (Bursa, TURKEY) for the use of their herd and facilities. Support was also provided by the The Scientific and Technological Research Council of Turkey (TUBITAK) grant no. TOVAG 1070227.en_US
dc.identifier.citationTaşdemir, U., Mecitoğlu, G. Y., Keskin, A., Karakaya, E., Çelik, Y., Güzeloğlu, A., Gümen, A. (2011). Conception Rate Following Timed Artificial Insemination Protocols in Dairy Heifers Synchronised by PGF2α and GnRH. Ankara Üniversitesi Veteriner Fakültesi Dergisi, 58(2), 135-139.
dc.identifier.doi10.1501/Vetfak_0000002463en_US
dc.identifier.endpage139en_US
dc.identifier.issn1300-0861en_US
dc.identifier.issn1308-2817en_US
dc.identifier.issue2en_US
dc.identifier.startpage135en_US
dc.identifier.urihttps://dx.doi.org/10.1501/Vetfak_0000002463
dc.identifier.urihttps://hdl.handle.net/20.500.12395/26273
dc.identifier.volume58en_US
dc.identifier.wosWOS:000307987600011en_US
dc.identifier.wosqualityQ4en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.institutionauthorGuzeloglu, Aydin
dc.language.isoenen_US
dc.publisherANKARA UNIV PRESSen_US
dc.relation.ispartofANKARA UNIVERSITESI VETERINER FAKULTESI DERGISIen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.selcuk20240510_oaigen_US
dc.subjectDairy heifersen_US
dc.subjectGnRHen_US
dc.subjectPGF2αen_US
dc.subjecttimed artificial inseminationen_US
dc.subjectsynchronizationen_US
dc.titleConception rate following timed artificial insemination protocols in dairy heifers synchronised by PGF2? and GnRHen_US
dc.typeArticleen_US

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