{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,29]],"date-time":"2026-10-29T08:10:31Z","timestamp":1793261431001,"version":"4.5.0"},"reference-count":18,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2016,4,25]],"date-time":"2016-04-25T00:00:00Z","timestamp":1461542400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Aust Veterinary J"],"published-print":{"date-parts":[[2016,5]]},"abstract":"<jats:sec><jats:title>Objective<\/jats:title><jats:p>To examine factors associated with fertility on dairy farms that used a common fixed\u2010time artificial insemination (<jats:styled-content style=\"fixed-case\">FTAI<\/jats:styled-content>) program in yearling heifers.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Records were analysed from 954 yearling heifers on 10 south\u2010west Victorian dairy farms that used a common <jats:styled-content style=\"fixed-case\">FTAI<\/jats:styled-content> program, involving the insertion of a 1.9\u2010g progesterone\u2010releasing device for 10 days; 2\u2009mg oestradiol benzoate at insertion; 500 \u00b5g cloprostenol on day 7; and <jats:styled-content style=\"fixed-case\">FTAI<\/jats:styled-content> 48 h after device removal. Weight, age, expression of oestrus, sire, semen type (frozen sex\u2010sorted or frozen conventional) and timing of insemination were examined for their relationship with first\u2010service conception rates.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Heifers over 300\u2009kg body weight were 1.18\u2010fold more likely to express oestrus during the <jats:styled-content style=\"fixed-case\">FTAI<\/jats:styled-content> program. For every extra 1\u2009kg, there was a 1.5% increase in the likelihood of expressing oestrus. First\u2010service conception rates were 40.3% and 56.0% for sex\u2010sorted and conventional semen, respectively, and were significantly higher when oestrus was expressed. The difference was greater for sex\u2010sorted semen (3.4\u2010fold) compared with conventional semen (1.5\u2010fold). The interval from device removal to insemination varied between 47 and 51.4 h and had no significant effect on conception rates. However, there was a trend towards a higher conception rate for sex\u2010sorted semen when inseminations were performed &gt;50 h after device removal.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Increased fertility was associated with larger heifers and heifers that expressed oestrus, particularly when sexed\u2010sorted semen was used. Variation in the timing of <jats:styled-content style=\"fixed-case\">AI<\/jats:styled-content> with respect to device removal between 47 and 51.4 h did not adversely affect conception rates.<\/jats:p><\/jats:sec>","DOI":"10.1111\/avj.12430","type":"journal-article","created":{"date-parts":[[2016,4,26]],"date-time":"2016-04-26T21:43:40Z","timestamp":1461707020000},"page":"145-148","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Factors associated with fertility of nulliparous dairy heifers following a 10\u2010day fixed\u2010time artificial insemination program with sex\u2010sorted and conventional semen"],"prefix":"10.1111","volume":"94","author":[{"given":"EJ","family":"Noonan","sequence":"first","affiliation":[{"name":"Faculty of Veterinary and Agricultural Sciences University of Melbourne  250 Princes Highway Werribee, Victoria 3030 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