If you regularly see backyard poultry, you may need additional USDA accreditation. TheNational Veterinary Accreditation Program(NVAP) accredits veterinarians in two different tiers based upon species involved, and you must be accredited in the proper tier to perform official duties...
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Backyard Chickens 101
Veterinary Feed Directives
Chicks, Ducklings & Salmonella