Abstract
ABSTRACT Angus × Hereford cows (2 and 3 yr of age, n = 37) were used to evaluate the effects of postpartum BW gain and treatment with bovine somatotropin (bST) on concentrations of IGF-I, glucose, and insulin in plasma during early lactation; luteal activity; and calf growth. Cows (456 ± 52 kg, BCS = 4.6 ± 0.4) were stratified based on calving date and BCS and randomly assigned to a 2 × 2 × 2 factorial: weight gain ≤0.4 kg/d (MWG) or >0.4 kg/d (HWG) during 24 to 59 d postpartum, injection with bST or saline (CON) on d 31 and 45 postpartum, and 2 or 3 yr of age. Concentrations of IGF-I in plasma before bST treatment were greater (P = 0.02) for HWG compared with MWG cows, and IGF-I was greater (P
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