No treatment effects were detected for BW and BCS change (P¼0.79) during the experiment (Table 1).
Further, no treatment effects were detected (P¼0.73) for serum P4 concentrations (Table 1).Treatment day interactions were detected (Po0.01) for serum IGF-I and insulin. Beginning on d 2 of the experiment, BST cows had greater (P≤0.01) serum IGF-I concentrations compared with control cohorts (Fig. 1).Cows receiving BST had greater (P≤0.05) insulin concentrations compared with control cohorts from d 8 to d 11, d 16 and 17, as well as from d 19 to d 21 of the experiment (Fig. 2).A treatment effect was detected for serum glucose (Po0.01), NEFA (P¼0.01), and RQUICKI (Po0.01). Cows receiving BST had greater mean glucose and NEFA concentrations during the experiment compared with control
cohorts (Table 1). Based on serum glucose, insulin, and NEFA concentrations obtained prior to concentrate feeding,
cows receiving BST had reduced RQUICKI, which means reduced pre-prandial insulin sensitivity, compared with control cohorts (Table 1).