By Anne Lichtenwalner, DVM, Ph.D., Debra Kantor, Associate Extension Professor, University of Maine Cooperative Extension, and Jacki Perkins, Organic Dairy Specialist, Maine Organic Farmers and Gardeners Association. Based on work by Richard J. Brzozowski, Program Administrator, University of Maine Cooperative Extension. For information about UMaine Extension programs and resources, visit extension.umaine.edu.Find more of our publications