{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,29]],"date-time":"2026-05-29T20:18:34Z","timestamp":1780085914565,"version":"3.54.0"},"reference-count":27,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2014,1,28]],"date-time":"2014-01-28T00:00:00Z","timestamp":1390867200000},"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":[[2014,4]]},"abstract":"Contents<\/jats:title>The aim of this study was to compare pregnancy per artificial insemination (P\/AI<\/jats:styled-content>) after timed AI<\/jats:styled-content> with sex\u2010sorted sperm (SS<\/jats:styled-content>) or conventional semen (CS<\/jats:styled-content>) in lactating dairy cows. Cyclic cows (n\u00a0=\u00a0302) were synchronized by O<\/jats:styled-content>vsynch and randomly assigned into two groups at the time of AI<\/jats:styled-content>. Cows with a follicle size between 12 and 18\u00a0mm and clear vaginal discharge at the time of AI<\/jats:styled-content> were inseminated with either frozen\u2010thawed SS<\/jats:styled-content> (n\u00a0=\u00a0148) or CS<\/jats:styled-content> (n\u00a0=\u00a0154) of the same bull. A shallow uterine insemination was performed into the uterine horn ipsilateral to the side of probable impending ovulation. Pregnancy per AI<\/jats:styled-content> on D<\/jats:styled-content>ay 31 tended (p\u00a0=\u00a00.09) to be less for SS<\/jats:styled-content> (31.8%) than CS<\/jats:styled-content> (40.9%). Similarly, P<\/jats:styled-content>\/AI<\/jats:styled-content> on D<\/jats:styled-content>ay 62 was less (p\u00a0=\u00a00.01) for cows inseminated with SS<\/jats:styled-content> (25.7%) compared with CS<\/jats:styled-content> (39.0%). The increased difference in fertility between treatments from D<\/jats:styled-content>ays 31 to 62 was caused by the greater (p\u00a0=\u00a00.02) pregnancy loss for cows receiving SS<\/jats:styled-content> (19.2%) than CS<\/jats:styled-content> (4.8%). Cow parity (p\u00a0=\u00a00.02) and season (p\u00a0<\u00a00.01) when AI<\/jats:styled-content> was performed were additional factors affecting fertility. Primiparous cows had greater P\/AI<\/jats:styled-content> than multiparous cows both on D<\/jats:styled-content>ay 31 (41.7% vs 25.0% in SS<\/jats:styled-content> and 53.0% vs 31.8% in CS<\/jats:styled-content> groups) and on D<\/jats:styled-content>ay 62 (33.3% vs 20.5% in SS<\/jats:styled-content> and 48.5% vs 31.8% in CS<\/jats:styled-content> groups). During the hot season of the year, P<\/jats:styled-content>\/AI<\/jats:styled-content> on Day 31 was reduced (p\u00a0=\u00a00.01) in the SS<\/jats:styled-content> group (19.6%) when compared with the rates during the cool season (38.1%). In conclusion, sex\u2010sorted sperm produced lower fertility results compared to conventional semen even after using some selection criteria to select most fertile cows.<\/jats:p>","DOI":"10.1111\/rda.12280","type":"journal-article","created":{"date-parts":[[2014,1,28]],"date-time":"2014-01-28T09:27:31Z","timestamp":1390901251000},"page":"333-337","source":"Crossref","is-referenced-by-count":26,"title":["Fertility in Dairy Cows After Artificial Insemination Using Sex\u2010Sorted Sperm or Conventional Semen"],"prefix":"10.1111","volume":"49","author":[{"given":"E","family":"Karakaya","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynecology Faculty of Veterinary Medicine University of Uludag Bursa Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"G","family":"Yilmazbas\u2010Mecitoglu","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology Faculty of Veterinary Medicine University of Uludag Bursa Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A","family":"Keskin","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology Faculty of Veterinary Medicine University of Uludag Bursa Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A","family":"Alkan","sequence":"additional","affiliation":[{"name":"TARFAS Co. 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