{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,8]],"date-time":"2025-10-08T15:14:55Z","timestamp":1759936495502},"reference-count":26,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2017,3,27]],"date-time":"2017-03-27T00:00:00Z","timestamp":1490572800000},"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":[[2017,4]]},"abstract":"<jats:sec><jats:title>Objective<\/jats:title><jats:p>To determine the effects of ovarian structures present at <jats:styled-content style=\"fixed-case\">Ovsynch\u2122<\/jats:styled-content> enrolment, disease history, lactation variables and times bred on pregnancy per fixed\u2010time artificial insemination (<jats:styled-content style=\"fixed-case\">FTAI<\/jats:styled-content>) following fixed\u2010time insemination after Ovsynch and to determine the relationship between the size of ovarian follicular structures and concurrent presence of a corpus luteum (<jats:styled-content style=\"fixed-case\">CL<\/jats:styled-content>).<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The study was conducted in a 3000\u2010cow Holstein dairy herd. Over a 6\u2010month period, 886 non\u2010pregnant cows were examined by transrectal ultrasound and enrolled into 1132 Ovsynch events. Enrolled cows were synchronised using an Ovsynch\u201056 protocol. At enrolment, both ovaries were scanned by transrectal ultrasound to identify and record the presence and size of ovarian structures. Cows that did not return to oestrus were pregnancy tested 32\u201338 days post\u2010insemination. Univariable and multivariable generalised linear mixed models (<jats:styled-content style=\"fixed-case\">GLMMs<\/jats:styled-content>) were used to determine the effect of each variable on pregnancy per <jats:styled-content style=\"fixed-case\">FTAI<\/jats:styled-content>. A univariable <jats:styled-content style=\"fixed-case\">GLMM<\/jats:styled-content> was also used to analyse the relationship between size of the dominant follicular structure and concurrent presence of a <jats:styled-content style=\"fixed-case\">CL<\/jats:styled-content>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>\n<jats:styled-content style=\"fixed-case\">CL<\/jats:styled-content> size (P\u2009=\u20090.039) and presence of a luteal cyst (P\u2009=\u20090.002) at Ovsynch enrolment significantly increased the odds of pregnancy. Occurrence of lameness (P\u2009=\u20090.035) or mastitis (P\u2009=\u20090.008) between calving and enrolment significantly decreased the odds of pregnancy. Neither the presence nor size of a follicular structure significantly affected the odds of pregnancy, although cows with larger follicular structures were less likely to have a concurrent <jats:styled-content style=\"fixed-case\">CL<\/jats:styled-content> (P\u2009&lt;\u20090.001).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Presence of luteal tissue at Ovsynch enrolment and recent disease events affected pregnancy per <jats:styled-content style=\"fixed-case\">FTAI<\/jats:styled-content> in cows inseminated after Ovsynch.<\/jats:p><\/jats:sec>","DOI":"10.1111\/avj.12573","type":"journal-article","created":{"date-parts":[[2017,3,27]],"date-time":"2017-03-27T17:07:00Z","timestamp":1490634420000},"page":"110-117","update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Effects of ovarian structures identified at <scp>Ovsynch\u2122<\/scp> enrolment, disease history and lactation variables on odds 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