® JOURNAL OF DAIRY SCIENCE SINCE 1917 1800 S. Oak St., Ste 100, Champaign, IL 61820 Phone 217/356-5146 | Fax 217/378-4083 | http://www.journalofdairyscience.org Matthew C. Lucy, Editor-in-Chief (19) University of Missouri; [email protected]; 573/882-9897 Invited Reviews Production Health, Behavior, and Well-being Kerst Stelwagen, Editor (21) Animal Nutrition Tanya Gressley, Senior Editor (20) SciLactis Ltd. University of Delaware Paul Kononoff, Senior Editor (19) University of Nebraska Jon Huxley, Editor (20) Massey University Dairy Foods Jeffrey L. 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A. G. von Keyserlingk (21) University of British Columbia Journal of Dairy Science (ISSN 1525-3198) is published online (http://www.journalofdairyscience.org) monthly on behalf of the American Dairy Science Association® by FASS Inc., Champaign, IL 61820, and Elsevier Inc., 360 Park Avenue South, New York, NY 10010-1710. Business and Editorial Offi ce: 1600 John F. Kennedy Blvd., Ste. 1800, Philadelphia, PA 19103-2899. Customer Services Offi ce: 3251 Riverport Lane, Maryland Heights, MO 63043. .