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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

From: Pregnancy success of lactating Holstein cows after a single administration of a sustained-release formulation of recombinant bovine somatotropin

  Treatmentb    
  Control bST p AOR CI
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
  1. a Abbreviations are bST; bovine somatotropin; AOR, adjusted odds ratio; CI, 95% confidence interval; NS, non-significant
  2. b Data are the number of cows with that classification/total cows inseminated and, in parentheses, percent.