Our Welsummer Rooster What Is Biosecurity? - and Why Does It Matter? Biosecurity is the set of preventative practices designed to reduce the introduction and spread of infectious diseases. In backyard poultry, biosecurity is your first — and often only — line of defense. In Canada, access to poultry veterinarians and medications is limited. That means prevention carries far more weight than treatment. Proper biosecurity reduces the risk of devastating diseases such as: Avian