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An improved milk yield due to bovine somatotropin (BST) was found to correspond to an increased mammary blood flow (Mepham et al, 1984) and cardiac output (Davis et al, 1988). As milk yield and mammary blood flow were closely related, we attempted to determine primary effects (blood flow or milk secretion) by comparing mammary blood flow responses to BST in lactating and dry cows. Two dry and 3 lactating Holstein cows were used. Recombinant BST (Lilly France) was injected sc (30 mg/d) over an 8-d period. Daily mammary blood flow was measured in the common external pudic artery by ultrasound transittime blood flowmeter. Measurements were tak-

The effects of bovine somatotropin injections on mammary blood flow in dry and lactating dairy cows