{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,16]],"date-time":"2026-02-16T12:15:01Z","timestamp":1771244101552,"version":"3.50.1"},"reference-count":80,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2026,2,15]],"date-time":"2026-02-15T00:00:00Z","timestamp":1771113600000},"content-version":"vor","delay-in-days":45,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"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":["Veterinary Medicine International"],"published-print":{"date-parts":[[2026,1]]},"abstract":"<jats:p>\n                    In Ethiopia, the reproductive efficiency of dairy cattle utilizing artificial insemination (AI) is low, and implementing estrus and ovulation synchronization protocols could enhance the efficiency. Therefore, this study was designed to evaluate the effect of progesterone (P4) supplementation during Co\u2010Synch on estrus response (ER) and pregnancy per AI (P\/AI) in crossbred dairy cattle breed in Southwestern Ethiopia. In the trial, heifers and cows (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u2009120) were enrolled in the study. All animals received 100\u2009\u03bcg of gonadotropin\u2010releasing hormone (GnRH) and had a progesterone\u2010releasing intravaginal device (PRID) inserted intravaginally on Day 0. On Day 7, they received 25\u2009mg of prostaglandin (PGF2\n                    <jats:italic>\u03b1<\/jats:italic>\n                    ), followed by the removal of the PRID. On Day 9, animals received 100\u2009\u03bcg of GnRH concurrent with insemination. Estrus signs were monitored to assess heat response during morning and evening for at least 30\u2009min at approximately 12\u2010h intervals from PRID removal on Days 7 through 9. Trans\u2010rectal ultrasonography was used to diagnose pregnancy 60\u2009days after AI. The P\/AI was recorded as the total number of pregnant females from the total number of animals involved in the synchronization program. A logistic regression analysis was performed to test the effectiveness of the treatment on ER and PR. 80% of animals showed ER to the treatment. A greater percentage of primiparous cows (93.33%) responded to the treatment, followed by heifers (83.33%), while the lowest response was seen in cows with a parity of 3 (66.67%). A total of 59.17% of the overall P\/AI was achieved. The P\/AI was affected by parity; a higher P\/AI was obtained from the primiparous group. Statistically, no bull or BCS effect on P\/AI was observed in the current study. Supplementation of P4 improved pregnancy outcomes, surpassing the national average, suggesting the protocol\u2019s success in synchronizing estrus and ovulation among crossbred cows and heifers.\n                  <\/jats:p>","DOI":"10.1155\/vmi\/1243812","type":"journal-article","created":{"date-parts":[[2026,2,16]],"date-time":"2026-02-16T11:32:48Z","timestamp":1771241568000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Fertility of Crossbred Dairy Cattle After Progesterone\u2010Supplemented Co\u2010Synch in Southwestern Ethiopia"],"prefix":"10.1155","volume":"2026","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-2737-1239","authenticated-orcid":false,"given":"Aregaw Abera","family":"Dodicho","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-4079-4851","authenticated-orcid":false,"given":"Sileshi Tadesse","family":"Gebeyehu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zelalem Yilma","family":"Kidane","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2026,2,15]]},"reference":[{"key":"e_1_2_10_1_2","unstructured":"CSA Federal Democratic Republic of Ethiopia Central Statistical Agency Agricultural Sample Survey 2020\/21 [2013 E.C.] Volume Ii Report on Livestock and Livestock Characteristics."},{"key":"e_1_2_10_2_2","volume-title":"A Review of the Ethiopian Dairy Sector. 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