Bovine somatotropin

Journal or Publishing Institution: JAMA: Journal of the American Medical Association

Study: http://jama.jamanetwork.com/article.aspx?articleid=385333

Author(s): Kronfeld, D.S.

Article Type: Journal Publication

Record ID: 1299

Abstract: Contrary to assertions in the editorial and Special Communication, administration of bST does significantly change milk composition, mainly reflecting tissue utilization to make extra milk, such as an increase in long-chain fatty acids. One importantexception is the increase in insulinlike growth factor I (IGF-I) to levels found usually in the first 2 weeks of lactation.4 Such oral doses of IGF-I have no systemic effects in young rats.4 Possible local effects of IGF-I-laden milk on the digestive tract of mature humans remain in question.