Frequent milking during early lactation does not diminish a cow’s response to bovine somatotropin later in her lactation, according to research from the University of Illinois.

During the study, researchers milked cows six times per day during the first three weeks after calving. Afterward, they measured the cows’ response to BST at different stages of lactation. The chart below summarizes the results.

The research findings will appear in an upcoming issue of the Veterinary Clinics of North America.