{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,16]],"date-time":"2026-10-16T21:53:40Z","timestamp":1792187620423,"version":"4.4.0"},"reference-count":28,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2017,2,19]],"date-time":"2017-02-19T00:00:00Z","timestamp":1487462400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Reprod Domestic Animals"],"published-print":{"date-parts":[[2017,6]]},"abstract":"Contents<\/jats:title>Environmental factors such as the temperature\u2013humidity index (THI<\/jats:styled-content>) are known to affect reproductive parameters in cattle. Therefore, here, we examined whether there was any correlation between the THI<\/jats:styled-content> and the reproductive performance of Japanese Black cattle by analysing the first\u2010service conception rates of 178,492 artificially inseminated cows across 9,833 herds in south\u2010western Japan over a 3\u2010year period. The daily mean (\u00b1SD<\/jats:italic>) THI<\/jats:styled-content> over the study period was 63.6\u00a0\u00b1\u00a011.3 (range: 41.4\u201381.5). The calving to first artificial insemination (AI<\/jats:styled-content>) interval was significantly negatively correlated with THI<\/jats:styled-content> in the month of AI<\/jats:styled-content> (r<\/jats:italic>\u00a0=\u00a0\u2212.75, p<\/jats:italic>\u00a0<\u00a0.001), whereas conception rate to first AI<\/jats:styled-content> (CRFA<\/jats:styled-content>) showed a cyclical change that did not correspond with that of THI<\/jats:styled-content>, resulting in a time lag between CRFA<\/jats:styled-content> and THI<\/jats:styled-content> in the month of AI<\/jats:styled-content>. Furthermore, there was a stronger correlation between CRFA<\/jats:styled-content> and THI<\/jats:styled-content> between 3 and 2\u00a0months before AI<\/jats:styled-content> (r<\/jats:italic>\u00a0=\u00a0.76 vs. .83, p<\/jats:italic>\u00a0<\u00a0.001) than in the month of AI<\/jats:styled-content> (r<\/jats:italic>\u00a0=\u00a0.34, p<\/jats:italic>\u00a0=\u00a0.04). Therefore, this extensive field study showed that a decrease in THI<\/jats:styled-content> was associated with declined reproductive performance in Japanese Black cattle and that the impact of the cold environment on the conception rate is attributable to a carryover effect from the cold season before AI<\/jats:styled-content> rather than conditions at the time of AI<\/jats:styled-content>.<\/jats:p>","DOI":"10.1111\/rda.12917","type":"journal-article","created":{"date-parts":[[2017,2,20]],"date-time":"2017-02-20T04:42:40Z","timestamp":1487565760000},"page":"371-375","source":"Crossref","is-referenced-by-count":20,"title":["Impaired reproduction in Japanese Black cattle under cold environmental conditions"],"prefix":"10.1111","volume":"52","author":[{"given":"H","family":"Nabenishi","sequence":"first","affiliation":[{"name":"Laboratory of Animal Feeding and Management Department of Animal Science School of Veterinary Medicine Kitasato University Towada Aomori Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A","family":"Yamazaki","sequence":"additional","affiliation":[{"name":"Laboratory of Animal Feeding and Management Department of Animal Science School of Veterinary Medicine Kitasato University Towada Aomori Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2017,2,19]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"crossref","unstructured":"Britt J. 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