Effect of delaying the time of insemination with sex-sorted semen on pregnancy rate in Holstein heifers

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dc.contributor.authorGuner, Baris
dc.contributor.authorErturk, Melih
dc.contributor.authorYilmazbas-Mecitoglu, Gulnaz
dc.contributor.authorKeskin, Abdulkadir
dc.contributor.authorKarakaya-Bilen, Ebru
dc.contributor.authorCakircali, Rabia
dc.contributor.authorSerim, Enes
dc.date.accessioned2024-12-24T19:09:52Z
dc.date.available2024-12-24T19:09:52Z
dc.date.issued2020
dc.departmentSiirt Üniversitesi
dc.description.abstractThe objective of the study was to evaluate the interval from onset of oestrus to time of artificial insemination (AI) to obtain the optimum pregnancy rate with sex-sorted semen in Holstein heifers. Heifers in oestrus were detected and inseminated only by using heat–rumination neck collar comprised electronic identification tag at the age of 13–14 months. Heifers (n = 283) were randomly assigned to one of three groups according to the timing of insemination at 12–16 hr (G1, n = 97), at 16.1–20 hr (G2, n = 94) and at 20.1–24 hr (G3, n = 92) after reaching the activity threshold. The mean duration of oestrus was 18.6 ± 0.1 hr, and mean peak activity was found at 7.5 ± 0.1 hr after activity threshold. The mean interval from activity threshold to ovulation was 29.4 ± 0.4 hr. The overall pregnancy per AI (P/AI) was 53.0% at 29–35 days and 50.9% at 60–66 days after AI. There was a significant reduction between G1 (13.8 ± 1.4 hr) and G3 (7.9 ± 1.4 hr) related to the intervals from AI to ovulation time. Sex-sorted semen resulted in significantly higher P/AI at 29–35 days when heifers inseminated in G3 (60.9%) after oestrus than those inseminated in G1 (49.5%) and G2 (48.9%). In terms of fertility, when the temperature–humidity index (THI) was below the threshold value (THI ?65) at the time of AI, there was a tendency (?65; 57.2% vs. > 65; 47.1%) for high pregnancy rate. There was no effect of sire on P/AI. In addition, the interaction of the technician with the time of AI was found significant, and three-way interaction of technician, sire and time of AI was tended to be significant on pregnancy rate. Thus, in addition to delaying the time of insemination (between 20.1 and 24 hr) after oestrous detection, THI and experienced technician were also found to be critical factors in increasing fertility with the use of sex-sorted semen in Holstein heifers. © 2020 Wiley-VCH GmbH
dc.description.sponsorshipULUOVA; University of Uludag Scientific Research Projects Council, (2016/13); National Institutes of Health, NIH, (F20TW002016)
dc.identifier.doi10.1111/rda.13789
dc.identifier.endpage1417
dc.identifier.issn0936-6768
dc.identifier.issue10
dc.identifier.pmid32744337
dc.identifier.scopus2-s2.0-85091458858
dc.identifier.scopusqualityQ2
dc.identifier.startpage1411
dc.identifier.urihttps://doi.org10.1111/rda.13789
dc.identifier.urihttps://hdl.handle.net/20.500.12604/3825
dc.identifier.volume55
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.language.isoen
dc.publisherBlackwell Publishing Ltd
dc.relation.ispartofReproduction in Domestic Animals
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20241222
dc.subjectHolstein heifers
dc.subjectinsemination time
dc.subjectsex-sorted semen
dc.titleEffect of delaying the time of insemination with sex-sorted semen on pregnancy rate in Holstein heifers
dc.typeArticle

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