Atropine Blockage of Ovulation in the Cow and Its Possible Significance

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Abstract
The time of ovulation was determined for 5 heifers in a control estrous period and in a subsequent estrous period in which atropine was administered at the beginning of heat. Ovulation was delayed from 24–66 hrs. in 4 of the 5 heifers by the atropine treatment. The time of ovulation was also determined for 5 heifers in a control estrous period and a subsequent estrous period in which both atropine and chorionic gonadotropin, as a source of L.H., were administered at the beginning of heat. Ovulation occurred slightly earlier than the expected time in 4 of the 5 heifers treated with both atropine and chorionic gonadotropin. These results indicate that a neural factor is involved in the release of L.H. and ovulation in dairy cattle.