Assertion: estrus | /r/HasProperty | dr. jamie e. larson
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text: It occurs every 18 to 24 days in sexually mature, open (nonpregnant) female cattle when they are receptive to mounting activity by bulls or other cows or heifers, according to Dr. Jane A. Parish, Associate Extension/ Research Professor, Animal and Dairy Sciences; Dr. Jamie E. Larson, Assistant Professor, Animal and Dairy Sciences; and Dr. Rhonda C. Vann, Associate Research Professor, Brown Loam Branch Experiment Station.