In late November, 2013, a diagnosis of abortion due to Neospora caninum was made in a fetus aborted from a coming second-calf cow in a north central South Dakota beef herd. The cow was one of 81 bred cows purchased at a sale earlier that month. Following the abortion, the purchased group was re-examined for pregnancy and 21/81 cows previously confirmed pregnant were found open.Nine other South Dakota ranchers were identified to have purchased bred cows from the same sale. All nine herds then had their purchased bred cows re-examined for pregnancy during December 2013 or January 2014. The size of the purchased groups ranged from 12-376 (average = 87). All nine herds found cows that were now open. The open rates in the ten groups of previously-confirmed-pregnant cows ranged from eight to 31 percent (average = 22%). In all, 205 out of 866 cows (24%) were diagnosed "not pregnant" bv their herd veterinarians.
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