{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,1]],"date-time":"2026-11-01T03:10:52Z","timestamp":1793502652078,"version":"4.5.0"},"reference-count":29,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2017,8,12]],"date-time":"2017-08-12T00:00:00Z","timestamp":1502496000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"Ito Foundation","award":["152"],"award-info":[{"award-number":["152"]}]},{"DOI":"10.13039\/501100012014","name":"Kieikai Research Foundation","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100012014","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Reprod Domestic Animals"],"published-print":{"date-parts":[[2018,2]]},"abstract":"Contents<\/jats:title>The conception rate (CR<\/jats:styled-content>) of Japanese Black cattle has been decreasing since 1990. The objectives of this study were to compare CR<\/jats:styled-content> by artificial insemination (AI<\/jats:styled-content>) number, and to assess the interaction between AI<\/jats:styled-content> number and possible factors related to CR<\/jats:styled-content> in Japanese Black cattle. Records of 11,182 AI<\/jats:styled-content> records for 6,741 heifers and 61,302 AI<\/jats:styled-content> records for 13,139 cows on 977 farms were analysed. The average CR<\/jats:styled-content> of heifers was 47.0%, and CR<\/jats:styled-content> at the first, second and third AI<\/jats:styled-content> was higher than at the fourth or subsequent AI<\/jats:styled-content> (p\u00a0<\/jats:italic><\u00a0<\/jats:italic>0.05). The average CR<\/jats:styled-content> of cows was 47.8%, and their CR<\/jats:styled-content> at first and second AI<\/jats:styled-content> was higher than the fourth or subsequent AI<\/jats:styled-content> (p\u00a0<\/jats:italic><\u00a0<\/jats:italic>0.05). Data analysis with CR<\/jats:styled-content> as the dependent variable revealed significant interactions of AI<\/jats:styled-content> number with interval from calving to first AI<\/jats:styled-content> and AI<\/jats:styled-content> season. Cows first serviced at \u226448\u00a0days post\u2010partum had lower CR<\/jats:styled-content> than those at \u226590\u00a0days at first AI<\/jats:styled-content> (p\u00a0<\/jats:italic><\u00a0<\/jats:italic>0.05), but the interval from calving to first AI<\/jats:styled-content> did not affect CR<\/jats:styled-content> at second AI<\/jats:styled-content>. Cows serviced in the autumn had a higher CR<\/jats:styled-content> at first AI<\/jats:styled-content> than those serviced in the spring and winter (p\u00a0<\/jats:italic><\u00a0<\/jats:italic>0.05); however, there was no seasonal difference in CR<\/jats:styled-content> at the second AI<\/jats:styled-content>. In summary, CR<\/jats:styled-content> began to decrease from the fourth AI<\/jats:styled-content> in heifers and the third AI<\/jats:styled-content> in cows. The AI<\/jats:styled-content> season and the interval from calving to first AI<\/jats:styled-content> significantly affected CR<\/jats:styled-content> only at the first AI<\/jats:styled-content>.<\/jats:p><\/jats:sec>","DOI":"10.1111\/rda.13049","type":"journal-article","created":{"date-parts":[[2017,8,12]],"date-time":"2017-08-12T05:42:40Z","timestamp":1502516560000},"page":"34-39","source":"Crossref","is-referenced-by-count":25,"title":["Effects of service number on conception rate in Japanese Black cattle"],"prefix":"10.1111","volume":"53","author":[{"given":"N","family":"Irikura","sequence":"first","affiliation":[{"name":"Department of Animal and Grassland Sciences Faculty of Agriculture University of Miyazaki Miyazaki Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M","family":"Uematsu","sequence":"additional","affiliation":[{"name":"Miyazaki Agricultural Mutual Aid Association Miyazaki Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"G","family":"Kitahara","sequence":"additional","affiliation":[{"name":"Department of Veterinary Sciences Faculty of Agriculture University of Miyazaki Miyazaki Japan"},{"name":"Center for Animal Disease Control University of Miyazaki Miyazaki Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"T","family":"Osawa","sequence":"additional","affiliation":[{"name":"Department of Veterinary Sciences Faculty of Agriculture University of Miyazaki Miyazaki Japan"},{"name":"Center for Animal Disease Control University of Miyazaki Miyazaki Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4612-6624","authenticated-orcid":false,"given":"Y","family":"Sasaki","sequence":"additional","affiliation":[{"name":"Center for Animal Disease Control University of Miyazaki Miyazaki Japan"},{"name":"Organization for Promotion of Tenure Track University of Miyazaki Miyazaki Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2017,8,12]]},"reference":[{"key":"e_1_2_8_2_1","first-page":"308","article-title":"Odds ratio and probability of conception of Holstein Friesian Dairy cows in the Kingdom of Saudi Arabia","volume":"18","author":"Ali A. 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