Table 2 Effect of bovine somatotropin administered 3 days before insemination on plasma progesterone concentrations on Day 0 and 7 relative to timed artificial insemination and on the percent of cows successfully synchronized (Experiment 2).^a

Low progesterone (< 1 ng/ml) on Day 0

112/124 (90.3%)

123/132 (93.2%)

NS

1.45

0.58 to 3.58

High progesterone (≥ 1 ng/ml) on Day 7

90/124 (72.6%)

107/132 (81.1%)

0.10

1.66

0.91 to 3.03

Synchronized (low on d 0 and high on Day 7)

85/110 (77.3%)

105/122 (86.1%)

0.10

1.78

0.89 to 3.58