{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,24]],"date-time":"2026-07-24T09:29:16Z","timestamp":1784885356468,"version":"3.55.0"},"reference-count":22,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2006,2,27]],"date-time":"2006-02-27T00:00:00Z","timestamp":1140998400000},"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":[[2006,4]]},"abstract":"<jats:title>Contents<\/jats:title><jats:p>The aim of this study was to investigate whether the skim milk progesterone concentrations at artificial insemination (AI) and day of rise of post\u2010ovulatory progesterone concentration thereafter affect the conception and embryonic death rates in repeat\u2010breeding cows. Milk samples were obtained from 96 repeat\u2010breeding cows that failed to conceive to three or more AIs. The samples were taken from the cows at the day of AI and three times\/week until day 45 post\u2010AI. Skim milk was obtained after centrifugation and used for progesterone assay. The cows with a progesterone concentration more than 0.5\u2003ng\/ml at AI showed a significantly higher incidence of late embryonic death than those having a progesterone concentration &lt;0.5\u2003ng\/ml at AI (p\u2003&lt;\u20030.01). As the progesterone level at insemination rose, conception rate declined. A negative correlation was shown between conception rate and skim milk progesterone level at AI. Of 56 cows showing a rise of progesterone to 1\u2003ng\/ml or more within 6\u2003days after AI, 28 cows (50%) conceived. On the contrary, only eight of 39 cows (20.5%) conceived when the progesterone rose up to 1\u2003ng\/ml after day 6 post\u2010AI. We concluded that increased progesterone concentration at the time of AI and delayed rise of progesterone post\u2010AI might lead to decrease in fertility in repeat\u2010breeding cows.<\/jats:p>","DOI":"10.1111\/j.1439-0531.2006.00667.x","type":"journal-article","created":{"date-parts":[[2006,2,27]],"date-time":"2006-02-27T17:51:04Z","timestamp":1141062664000},"page":"180-183","source":"Crossref","is-referenced-by-count":14,"title":["Milk Progesterone Profile at and after Artificial Insemination in Repeat\u2010Breeding Cows: Effects on Conception Rate and Embryonic Death"],"prefix":"10.1111","volume":"41","author":[{"given":"ME","family":"Ghanem","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"T","family":"Nakao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K","family":"Nakatani","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M","family":"Akita","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"T","family":"Suzuki","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2006,2,27]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1439-0442.1991.tb01004.x"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0093-691X(96)00348-2"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(81)82864-0"},{"key":"e_1_2_6_5_1","first-page":"30","volume-title":"Influence of suprabasal progesterone on preovulatory follicle development in heifers. 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