A vaccination program is a tailored approach based on factors like bird type (broiler, layer, breeder), location, and local disease risk, but a typical schedule includes early vaccination against Marek’s Disease on day one. Subsequently, depending on the flock’s purpose, vaccinations for diseases like Newcastle Disease, Infectious Bronchitis, and Infectious Bursal Disease (Gumboro) are administered via eye drops or drinking water, with boosters as needed. Consulting a local veterinarian or bird supplier for a customized schedule is the most reliable approach.