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Effectiveness of Selected Methods of Estrus Cycle Manipulation in Mares During the Breeding Season: A Retrospective Clinical Study

cris.lastimport.scopus2025-10-23T06:56:56Z
cris.virtual.author-orcid0000-0002-5553-6721
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cris.virtualsource.author-orcidd4acdb17-bc02-4f0d-af4e-10c3038d84d0
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cris.virtualsource.author-orcidf9afb1ae-f16d-4b00-9b01-bceecb2fb187
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dc.abstract.enHormones used for the induction of estrus and ovulation are widely applied in veterinary practice. The objectives of this study were: (1) to assess the effect of cloprostenol on estrus induction, (2) to evaluate the effect of hCG on changes in the endometrial edema pattern and its direct impact on the timing of ovulation in relation to the progression of the breeding season, and (3) to assess the effects of cloprostenol and hCG on the induction of multiple ovulations (MO) and multiple pregnancies (MP).The first group of mares (n = 77), with spontaneous estrus, received a dose of hCG to induce ovulation, while the second group (n = 40) had estrus induced by cloprostenol, followed by an hCG injection. The pregnancy rate was 55.8% in the first group and 65% in the second group (p < 0.073). The frequency of MO was higher in the second group (27.5%) compared to 3.9% in the first group (p < 0.0006). However, this treatment did not affect the frequency of MP. Endometrial edema scores at the time of hCG administration significantly decreased over time in both groups. Cloprostenol can increase the frequency of MO without affecting MP.
dc.affiliationWydział Medycyny Weterynaryjnej i Nauk o Zwierzętach
dc.affiliation.instituteKatedra Genetyki i Podstaw Hodowli Zwierząt​​
dc.contributor.authorRyszka, Wojciech
dc.contributor.authorKurek, Natalia
dc.contributor.authorMichlik- Połczyńska, Katarzyna
dc.contributor.authorSowińska, Natalia
dc.contributor.authorKozdrowski, Roland
dc.date.access2025-08-19
dc.date.accessioned2025-08-19T12:17:42Z
dc.date.available2025-08-19T12:17:42Z
dc.date.copyright2025-03-12
dc.date.issued2025
dc.description.abstract<jats:p>Hormones used for the induction of estrus and ovulation are widely applied in veterinary practice. The objectives of this study were: (1) to assess the effect of cloprostenol on estrus induction, (2) to evaluate the effect of hCG on changes in the endometrial edema pattern and its direct impact on the timing of ovulation in relation to the progression of the breeding season, and (3) to assess the effects of cloprostenol and hCG on the induction of multiple ovulations (MO) and multiple pregnancies (MP).The first group of mares (n = 77), with spontaneous estrus, received a dose of hCG to induce ovulation, while the second group (n = 40) had estrus induced by cloprostenol, followed by an hCG injection. The pregnancy rate was 55.8% in the first group and 65% in the second group (p &amp;amp;lt; 0.073). The frequency of MO was higher in the second group (27.5%) compared to 3.9% in the first group (p &amp;amp;lt; 0.0006). However, this treatment did not affect the frequency of MP. Endometrial edema scores at the time of hCG administration significantly decreased over time in both groups. Cloprostenol can increase the frequency of MO without affecting MP.</jats:p>
dc.description.accesstimebefore_publication
dc.description.bibliographyil., bibliogr.
dc.description.financepublication_nocost
dc.description.financecost0,00
dc.description.versionoriginal_author
dc.identifier.doi10.20944/preprints202503.0881.v1
dc.identifier.urihttps://sciencerep.up.poznan.pl/handle/item/4290
dc.identifier.weblinkhttps://www.preprints.org/manuscript/202503.0881/v1#preprints-h2-5
dc.languageen
dc.relation.ispartofPreprints
dc.relation.pagesart. 2025030881
dc.rightsCC-BY
dc.sciencecloudnosend
dc.share.typeOPEN_REPOSITORY
dc.subject.enmare
dc.subject.enestrus
dc.subject.encloprostenol
dc.subject.enhCG
dc.subject.enmultiple ovulations
dc.subject.enmultiple pregnancies
dc.subtypePublicationInPreprintService
dc.titleEffectiveness of Selected Methods of Estrus Cycle Manipulation in Mares During the Breeding Season: A Retrospective Clinical Study
dc.typeJournalArticle
dspace.entity.typePublication