Evaluation of short estrus synchronization methods in dairy cows

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dc.contributor.authorCirit, Uemuet
dc.contributor.authorBacinoglu, Suleyman
dc.contributor.authorTas, Muzaffer
dc.contributor.authorDemir, Kamber
dc.contributor.authorBas, Ahmet
dc.contributor.authorAk, Kemal
dc.contributor.authorIleri, Irfan Kamuran
dc.date.accessioned2024-04-24T16:10:48Z
dc.date.available2024-04-24T16:10:48Z
dc.date.issued2008
dc.departmentDicle Üniversitesien_US
dc.description.abstractIn the present study, two new short estrus synchronization methods have been developed for lactating dairy cows. The study was completed in three consecutive phases. In experiment (Exp) 1, 32 cows, that were not detected in estrus since calving between the 50th and 84th post-partum days, were treated with PGF2 alpha (PGF, D-Cloprostenol, 0.150 mg), estradiol propionate (EP, 2 mg) and GnRH (lecirelina, 50 mu g) at 24 h intervals, respectively, and timed artificial insemination (TAI) was performed 48 h after PGF. Different from Exp 1, EP and GnRH were given at 48 and 60 h, respectively after PGF in Exp 2 (n = 20), instead of 24 and 48 h. Ovulations were investigated by ultrasound for 7 days starting from the day of PGF treatment, and ovulation rates were compared with the ones obtained in Exp 1. In Exp 3, cows were given the same treatments as Exp 2, but treatments started at certain estrus stages. Cows detected in estrus and with a confirmed ovulation (n = 27) after the second PGF given 11 days apart were assigned to three treatment groups. Treatment was initiated at Day 3 (group metestrus, n = 9), Day 12 (group diestrus, n = 9) and Day 18 (group proestrus, n = 9) after ovulation. All cows included in Exp 3 were TAI between 16 and 20 h after GnRH treatment. In Exp 2 and 3, blood samples were obtained once every 2 days, starting from Day 0 to the 10th day after GnRH injection, and once every 4 days between the 10th and the 22nd days after GnRH to examine post-treatment luteal development. During the study, animals exhibiting natural estrus were inseminated and served as controls (n = 85). The rate of estrus was found to be significantly higher in cows with an active corpus luteum (CL) at the start of Exp 1 (72.7% vs. 30.0%, P < 0.05) and the pregnancy rate tended to be higher than cows without an active CL (40.9% vs. 10.0%, P = 0.08). Compared to those in Exp 1, cows in Exp 2 had higher rates of synchronized ovulation (94.1% vs. 59.1%, P = 0.013), In Exp 3, estrus (P < 0.001) and pregnancy rates (P = 0.01) were found to be significantly higher in cows in the proestrus group than in those in the metestrus group. Comparable pregnancy rates were obtained from the first and second inseminations in Exp 1 and 3 with results from those inseminated at natural estrus (P > 0.05). It was concluded from the study that the treatment in Exp 1 and 3 could result in comparable pregnancy rates after timed Al of lactating dairy cows at random stages of the estrus cycle relating to those inseminated at natural estrus, but the stage of the estrus cycle can have significant effects on pregnancy rates. (C) 2007 Elsevier B.V. All rights reserved.en_US
dc.description.sponsorshipTiGEMen_US
dc.description.sponsorshipWe are very thankful to General Directorate of Agricultural Enterprises (TiGEM) for opening the doors of the farm for the study and, Directorate of Agricultural Enterprises of Turkgeldi of TiGEM, General Director Agriculture Engineer Cuma Yildirim, Head of Department of Cattle Rearing Agriculture Engineer Aydin Gorgundur and all the employees for their kind assistance and support during the entire study. The authors also give their thanks to Vetas Veteriner ve Tarim Ilaclari A.S. (Turkey) and general manager Prof. Dr. Huseyin Tan for their valuable contributions to the study by generously providing the Dalmarelin and Dalmazin.en_US
dc.identifier.doi10.1016/j.anireprosci.2007.12.004
dc.identifier.endpage76en_US
dc.identifier.issn0378-4320
dc.identifier.issn1873-2232
dc.identifier.issue1-4en_US
dc.identifier.pmid18276087
dc.identifier.scopus2-s2.0-54149109181
dc.identifier.scopusqualityQ1
dc.identifier.startpage65en_US
dc.identifier.urihttps://doi.org/10.1016/j.anireprosci.2007.12.004
dc.identifier.urihttps://hdl.handle.net/11468/15116
dc.identifier.volume109en_US
dc.identifier.wosWOS:000261270000006
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.ispartofAnimal Reproduction Science
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectDairy Cowsen_US
dc.subjectShort Synchronizationen_US
dc.subjectPgf2 Alphaen_US
dc.subjectGnrhen_US
dc.subjectEstradiol Propionateen_US
dc.titleEvaluation of short estrus synchronization methods in dairy cowsen_US
dc.titleEvaluation of short estrus synchronization methods in dairy cows
dc.typeArticleen_US

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