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Ninety six dairy cows, stratified according to parity into primiparous and pluriparous, were divided into three groups; short bull exposure (SBE; 10\u2003min, n\u2003=\u200332), long bull exposure (LBE; 4\u2003h, n\u2003=\u200332) or no bull exposure (NBE; n\u2003=\u200332). On day 45 post\u2010partum, all cows were treated with PGF2\u03b1 on three occasions 11\u201314\u2003days apart to synchronize oestrus. They were submitted to fixed time AI 80\u2003h after the third PGF2\u03b1 injection. Cows in the SBE and LBE groups were artificially inseminated 5\u2003min after the introduction of the bull. From a subset of cows (n\u2003=\u20036 per group; three primiparous and three pluriparous), blood samples were collected once every 5\u2003min starting 15\u2003min before AI until 15\u2003min after AI and analysed for oxytocin concentrations. Additional blood samples were collected for measurements of progesterone (P4) concentrations once daily for 4\u2003days starting on the day of AI and once every 3\u2003days thereafter until day 22. The effects of bull exposure, time, parity, difficulty of AI, and pregnancy on oxytocin and P4 concentrations were analysed using the mixed linear model procedure. Mean oxytocin concentrations or change in oxytocin concentrations after bull exposure or AI were not different among groups. Pregnancy rates for the NBE, SBE and LBE groups were 55.5%, 33.3% and 44.4%, respectively, and were not different among groups. In conclusion, acute bull exposure around the time of AI did not affect oxytocin and progesterone concentrations and did not improve pregnancy rates in dairy cattle under these farms conditions.<\/jats:p>","DOI":"10.1111\/j.1439-0531.2012.02136.x","type":"journal-article","created":{"date-parts":[[2012,6,20]],"date-time":"2012-06-20T05:05:26Z","timestamp":1340168726000},"page":"223-230","source":"Crossref","is-referenced-by-count":3,"title":["Effect of Acute Bull Exposure Around the Time of Artificial Insemination on Serum Oxytocin and Progesterone Concentrations and Pregnancy Rates in Dairy Cows"],"prefix":"10.1111","volume":"48","author":[{"given":"MM","family":"Ababneh","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"IN","family":"Obeidat","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"MQ","family":"Husein","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"AQ","family":"Talafha","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2012,6,20]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/0378-4320(87)90016-9"},{"key":"e_1_2_8_3_1","unstructured":"BaltesMM BottRC McFeeR SchulzJS ToombsCF BergmanJW MolineKV CuppAS 2006:Bull exposure when combined with a seven\u2010day MGA synchronization does not enhance conception rates in cows. 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