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Blood samples were withdrawn from a jugular vein on the day of Al, on day 21, and after each ultrasonographic examination between days 27 and 31, days 34 and 38, days 41 and 45 and days 55 and 59 after AI. Plasma concentrations of bovine pregnancy\u2010 associated glycoprotein 1 (bPAG\u20101) were measured by radioimmunoassay. The results showed that before day 31, ultrasonographic scanning was not very sensitive because six of the 30\u00a0calving cows were incorrectly diagnosed as non\u2010pregnant. In five of these animals, the uterus was located far cranial to the pelvic inlet. Five of the cows examined between days 27 and 31 were pregnant on the basis of plasma bPAG\u20101 levels on the same day, using 0.5\u00a0ng\/ml as the cut\u2010off point. Plasma levels of bPAG\u20101 and progesterone proved that four of the cows which had early positive ultrasonographic diagnoses but did not produce a calf, were pregnant when they were examined.<\/jats:p>","DOI":"10.1136\/vr.142.12.304","type":"journal-article","created":{"date-parts":[[2010,10,4]],"date-time":"2010-10-04T23:03:59Z","timestamp":1286233439000},"page":"304-306","source":"Crossref","is-referenced-by-count":45,"title":["Evaluation of false ultrasonographic diagnoses in cows by measuring plasma levels of bovine pregnancy\u2010associated glycoprotein 1"],"prefix":"10.1002","volume":"142","author":[{"given":"O.","family":"Szenci","sequence":"first","affiliation":[{"name":"University of Veterinary Science Department of Obstetrics and Reproduction H\u20101400 Budapest PO Box 2 Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.A.M.","family":"Taverne","sequence":"additional","affiliation":[{"name":"Department of Herd Health and Reproduction Veterinary Faculty University of Utrecht PO Box 80.151 3508 TD Utrecht The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.F.","family":"Beckers","sequence":"additional","affiliation":[{"name":"Service d'Obstetrique et de Pathologie de la Reproduction Faculte de Medicine Veterinaire B41, Sart Tilman B\u20104000 Liege Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.","family":"Sulon","sequence":"additional","affiliation":[{"name":"Service d'Obstetrique et de Pathologie de la Reproduction Faculte de Medicine Veterinaire B41, Sart Tilman B\u20104000 Liege Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.","family":"Varga","sequence":"additional","affiliation":[{"name":"University of Veterinary Science Department of Obstetrics and Reproduction H\u20101400 Budapest PO Box 2 Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"L.","family":"B\u00f6rzs\u00f6nyi","sequence":"additional","affiliation":[{"name":"University of Veterinary Science Department of Obstetrics and Reproduction H\u20101400 Budapest PO Box 2 Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ch.","family":"Hanzen","sequence":"additional","affiliation":[{"name":"Service de Physiologie de la Reproduction Faculte de Medicine Veterinaire B41, Sart Tilman B\u20104000 Liege Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gy.","family":"Schekk","sequence":"additional","affiliation":[{"name":"University of Veterinary Science Department of Obstetrics and Reproduction H\u20101400 Budapest PO Box 2 Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[1998,3,21]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/0093-691X(91)90362-H"},{"key":"e_1_2_6_3_1","first-page":"350","volume":"127","author":"BOYD J. 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