1992•Kansas Agricultural Experiment Station Research ReportsOpen access

Synchronization of estrus in yearling beef heifers with the MGA®/prostaglandin F2α system: III. timed insemination after 72 hours of estrous detection

Robert L. Larson, Larry R. Corah

Abstract

The percentage of heifers conceiving to artificial insemination (AI) following melengestrol acetate/prostaglandin F2"(MGA®/PG) estrous synchronization can be increased by mass insemination of all heifers not showing estrus by 72 h after PG. Inseminating at 12 h after estrus detection all heifers showing estrus within 72 h after PG; then inseminating those not detected in estrus by 72 h after PG as a group increased the proportion of heifers conceiving to AI by 10.8%.

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Key concepts: Estrous cycle, Estrus synchronization, Insemination, Artificial insemination, Prostaglandin f, Animal science, Prostaglandin, Biology