Colorado Serum Company, established in 1923 in Denver, CO, is a manufacturer of USDA-licensed veterinary biologicals and also a supplier of specialty animal bloods, serums, and other reagents. We maintain our own closed herds of donor animals (sheep, goats, horses, cattle, chickens, turkeys, guinea pigs, etc.) on our own premises under the control of our own veterinary staff. Animals are kept on an antibiotic-free diet and health records are maintained. Products are sterility tested prior to shipping, however freshly drawn blood can be provided at customer risk. Standing orders with a guaranteed price up to 6 months can be accomodated. Shipments are made by 2-day air. Please see our website or call us for further information.