The ovulatory response to human chorionic gonadotropin administration on day 4 post timed artificial insemination improved fertility in repeat breeder cows

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dc.authoridKarakaya-Bilen, Ebru/0000-0003-4837-1858
dc.authoridYimazbas Mecitoglu, Gulnaz/0000-0003-2817-3221
dc.authoridGuner, Baris/0000-0001-6414-6752
dc.contributor.authorYilmazbas-Mecitoglu, Gulnaz
dc.contributor.authorGumen, Ahmet
dc.contributor.authorKarakaya-Bilen, Ebru
dc.contributor.authorKeskin, Abdulkadir
dc.contributor.authorGuner, Baris
dc.contributor.authorCakircali, Rabia
dc.date.accessioned2024-12-24T19:30:49Z
dc.date.available2024-12-24T19:30:49Z
dc.date.issued2021
dc.departmentSiirt Üniversitesi
dc.description.abstractThis study focused on determining the success of inducing endogenous progesterone source (by formation of accessory corpus luteum) by human chorionic gonadotropin (hCG) administration on day 4 post timed artificial insemination (TAI) and on evaluating the effect of the day of hCG administration (day 4 or 5 post TAI) on pregnancy rates in repeat breeder cows according to their responses to hCG administrations. Non-pregnant cyclic lactating Holstein dairy cows with more than three services despite no clinical reproductive abnormalities were enrolled in the study. All cows (n = 192) received the Ovsynch protocol (GnRH-7d-PGF(2 alpha)-56h-GnRH-16/18h-TAI) and hCG administration (1500 IU, i.m.) was performed in group hCG4 (n = 64) on day 4 and in group hCG5 (n = 68) on day 5 post TAI. The control group (CON, n = 60) did not receive any hCG treatment. The responses (ovulation rate) to hCG (similar to 64%) were similar on days 4 and 5 post TAI. Pregnancy per AI (P/AI) at 31 days was similar among the groups (48.3% in CON, 48.4% in hCG4, and 42.6% in hCG5). Regardless of the day of the treatment (hCG4 + hCG5), the cows had an ovulatory response to hCG (54.1%), and a greater P/AI (P = 0.007) at 31 days than those without a response (29.8%). The administration of hCG on either day 4 or 5 post TAI did not increase overall pregnancy rates, however, the ovulatory response to the post TAI hCG administration on day 4 improved fertility in repeat breeder cows. Further studies are needed with a larger number of animals to reveal this potentiallly beneficial effect.
dc.description.sponsorshipTUBITAK-BIDEB 2219 International Postdoctoral Research Fellowship Program; University of Bursa Uludag, Scientific Research Projects Council [KUAP(V)-2019/1]
dc.description.sponsorshipDr. Gulnaz Yilmazbas-Mecitoglu was supported by the TUBITAK-BIDEB 2219 International Postdoctoral Research Fellowship Program. This study was also supported by University of Bursa Uludag, Scientific Research Projects Council, Grant No. KUAP(V)-2019/1.
dc.identifier.doi10.2754/avb202190010015
dc.identifier.endpage20
dc.identifier.issn0001-7213
dc.identifier.issn1801-7576
dc.identifier.issue1
dc.identifier.scopus2-s2.0-85104895264
dc.identifier.scopusqualityQ3
dc.identifier.startpage15
dc.identifier.urihttps://doi.org/10.2754/avb202190010015
dc.identifier.urihttps://hdl.handle.net/20.500.12604/7699
dc.identifier.volume90
dc.identifier.wosWOS:000654628800002
dc.identifier.wosqualityQ4
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherVeterinarni A Farmaceuticka Univerzita Brno
dc.relation.ispartofActa Veterinaria Brno
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_20241222
dc.subjectCattle
dc.subjectrepeat breeding
dc.subjecthCG
dc.subjectpost TAI
dc.titleThe ovulatory response to human chorionic gonadotropin administration on day 4 post timed artificial insemination improved fertility in repeat breeder cows
dc.typeArticle

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