Effect of stage of the estrous cycle on interval to estrus after PGF2α in beef cattle
Abstract
Effect of stage of the estrous cycle at the time of prostaglandin F2α (PGF2α) (b) injection on subsequent reproductive events in beef females was studied in four trials involving 194 animals. Cycling animals were given two injections of 25 mg PGF2α 11 days apart or, in some cases, the interval was altered to allow the second injection to fall on a specific day of the cycle. Day of estrous cycle at time of the second injection was determined by estrous detection. Interval from the second PGF2α injection to the onset of estrus (interval to estrus) was shorter (P