Affiliation: | * USDA, ARS, LPSI, Milk Secretion and Mastitis Laboratory, Beltsville, Maryland 20705, USA ** Dairy Science Department, V.P.I. and State University, Blacksburg, Virginia 24061, USA *** Ministere de Agriculture — INRA-CRJ, Laboratoire de Physiologie de la Lactation, 78350, Jouy-en-Josas, FRANCE |