ovulation and corpus luteum ( cl ) formation as judged by progesterone concentrations greater than or equal to 1 ng/ml occurred in 0/5 control , 4/5 200 ng gnrh , 4/4 400 ng gnrh , 4/5 5.5 ng buserelin and 3/5 11 ng buserelin cows .
C0023610
gnrh
C0006456
buserelin