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In April, 1996, 1501 yearling crossbred heifers located on seven different ranches were estrus-sync hronized and artificially inseminated (AI) 12 hours after th ey were detected in estrus. Herd size ranged from 82 to 43 9 head. Of the 1501 heifers, 86.1% were detected in estrus. First service conception rates of those 1292 heifers averaged 58.4% (40.3 to 68.8%). In three herds, ultrasonography was used to diagnose 525 heifers as pregnant at 30 days after AI. At 60 to 90 days after the breeding season, palpation of the uterus confirmed that embryonic dea th had occurred in 4.2% (4.0 to 4.8%). First service conception rates varied widely among ranch es. The variation might have been due to factors such as climate, average daily gain, body condition, A I technician, and AI sire. A small percentage of embryos died after the 30-day ultraso und exam regardless of the ranch or management system.

Estrus detection, first service conception, and embryonic death in beef heifers synchronized with MGA and prostaglandin