{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,28]],"date-time":"2026-01-28T00:15:43Z","timestamp":1769559343869,"version":"3.49.0"},"reference-count":35,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2026,1,20]],"date-time":"2026-01-20T00:00:00Z","timestamp":1768867200000},"content-version":"vor","delay-in-days":19,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,1,1]],"date-time":"2026-01-01T00:00:00Z","timestamp":1767225600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Animal Science Journal"],"published-print":{"date-parts":[[2026,1]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    We compared conception rates among Japanese Black cows undergoing ovulation synchronization protocols using intravaginal progesterone\u2010releasing devices (CIDR) across three different treatment durations. Cows received CIDR treatment for 7\u2009days in the Ovsynch (OS) group (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u200940), 8\u201310\u2009days in the short\u2010extended (SE) group (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u200942), and 11\u201314\u2009days in the long\u2010extended (LE) group (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u200967). Gonadotropin\u2010releasing hormone (GnRH) was injected concurrently with the CIDR insertion. On the day of CIDR withdrawal (Day 0), all cows received a prostaglandin F\n                    <jats:sub>2\u03b1<\/jats:sub>\n                    injection. When estrus signs were visually observed from Days 0 to 2, artificial insemination (AI) was performed concurrent with the GnRH injection. Cows without any estrus signs received GnRH injection on Day 2, followed by timed AI 16\u201320\u2009h later. Data from 149 AIs performed on 144 cows were analyzed. The LE group tended to show a higher estrus expression rate than the OS group (13.4% vs. 0.0%, respectively). Pregnancy per AI was comparable among all three groups (OS: 47.5%, SE: 47.6%, LE: 50.7%). In conclusion, extending the CIDR treatment duration did not affect the conception rates of Japanese Black cows. In LE group cows, AI following estrus detection is recommended to enhance pregnancy outcomes.\n                  <\/jats:p>","DOI":"10.1111\/asj.70154","type":"journal-article","created":{"date-parts":[[2026,1,21]],"date-time":"2026-01-21T07:43:52Z","timestamp":1768981432000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Effect of Extended Duration of Progesterone\u2010Based Ovulation Synchronization Protocol on Fertility in Japanese Black Cows"],"prefix":"10.1111","volume":"97","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-9815-5715","authenticated-orcid":false,"given":"Kazuhiro","family":"Bandai","sequence":"first","affiliation":[{"name":"Faculty of Veterinary Science, School of Veterinary Medicine Nippon Veterinary and Life Science University  Musashino Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ena","family":"Chiba","sequence":"additional","affiliation":[{"name":"Iwate Prefectural Federated Agricultural Mutual Aid Association  Morioka Iwate Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Toru","family":"Ogata","sequence":"additional","affiliation":[{"name":"Iwate Prefectural Federated Agricultural Mutual Aid Association  Morioka Iwate Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoshiyuki","family":"Tsuchiya","sequence":"additional","affiliation":[{"name":"Farm Animal Clinical Skills and Disease Control Center Iwate University  Morioka Iwate Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoshikazu","family":"Tanaka","sequence":"additional","affiliation":[{"name":"Faculty of Veterinary Science, School of Veterinary Medicine Nippon Veterinary and Life Science University  Musashino Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tadaharu","family":"Ajito","sequence":"additional","affiliation":[{"name":"Faculty of Veterinary Science, School of Veterinary Medicine Nippon Veterinary and Life Science University  Musashino Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ryotaro","family":"Miura","sequence":"additional","affiliation":[{"name":"Faculty of Veterinary Science, School of Veterinary Medicine Nippon Veterinary and Life Science University  Musashino Tokyo 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