Dairy and Beef Cattle Virginia Herd Health Management Service is located in scenic Madison, Virginia. The practice has concentrated on Dairy and Beef Cattle. The areas Dr. Patrick Comyn DVM has developed include: Reproductive Ultrasound Embryo Transfer - with embyro export certification Nutritional consultation Bull Fertility General Herd health management Laparoscopic artificial insemination in sheep, goats and deer Small ruminant medicine Give us a call today for any of your needs.