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However, there is no research on OPU\u2010IVF\u2010related traits in Japanese Black cattle from a breeding perspective. Therefore, we estimated genetic parameters of OPU\u2010IVF\u2010related traits in Japanese Black cows farmed in Hiroshima Prefecture. We used four OPU\u2010related traits (numbers of follicles [NF], collected COCs [CCOC], collected excellent COCs [ACCOC], and collected COCs used for IVF) and five IVF\u2010related traits (numbers of cleavage, eight\u2010cell stage, morula\u2010stage, blastocyst\u2010stage, and excellent or good blastocyst\u2010stage embryos) for OPU\u2010IVF\u2010related traits. Variance components were estimated using Bayesian approach. The estimated heritability of OPU\u2010IVF\u2010related traits ranged from 0.22\u2009\u00b1\u20090.09 (ACCOC) to 0.39\u2009\u00b1\u20090.22 (NF and CCOC) and showed for the first time that genetic improvement of OPU\u2010IVF\u2010related traits in Japanese Black cattle is feasible.<\/jats:p>","DOI":"10.1111\/asj.70079","type":"journal-article","created":{"date-parts":[[2025,6,22]],"date-time":"2025-06-22T19:23:46Z","timestamp":1750620226000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Estimation of Genetic Parameters for OPU\u2010IVF\u2010Related Traits in Japanese Black Cattle"],"prefix":"10.1111","volume":"96","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-9331-5527","authenticated-orcid":false,"given":"Hidemi","family":"Oyama","sequence":"first","affiliation":[{"name":"Institute of Livestock and Grassland Science, NARO  Tsukuba Ibaraki Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hinano","family":"Hashiba","sequence":"additional","affiliation":[{"name":"Hiroshima Prefectural Technology Research Institute Livestock Technology Research Center  Shobara Hiroshima Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eri","family":"Shibata","sequence":"additional","affiliation":[{"name":"Hiroshima Prefectural Technology Research Institute Livestock Technology Research Center  Shobara Hiroshima Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7438-8269","authenticated-orcid":false,"given":"Aisaku","family":"Arakawa","sequence":"additional","affiliation":[{"name":"Institute of Livestock and Grassland Science, NARO  Tsukuba Ibaraki Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takemasa","family":"Hidaka","sequence":"additional","affiliation":[{"name":"Hiroshima Prefectural Technology Research Institute Livestock Technology Research Center  Shobara Hiroshima Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5653-4234","authenticated-orcid":false,"given":"Motohide","family":"Nishio","sequence":"additional","affiliation":[{"name":"Institute of Livestock and Grassland Science, NARO  Tsukuba Ibaraki Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,6,22]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.2527\/jas.2016.1186"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.2016\u201012075"},{"key":"e_1_2_6_4_1","volume-title":"Introduction to Quantitative Genetics","author":"Falconer D. 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