the hazard of pregnancy,the proportion of pregnant cows at 45 days (experiments1 and 2)and the end of the 90-day BS (experiment1) .cows receiving TAI in either experiment became pregnant sooner than cows receiving ED or NS. in addition,multiparous cows,cows having greater BCS,and crossbred cows had greater rates of pregnancy and a higher proportion of pregnant cows at the end of the BS. incorporation of TAI programs early in the breeding season enhanced reproductive performance of suckled beef cows under pasture conditions.