It's likely you are referring to a specific vaccination strategy or schedule used in the poultry industry, but it's not commonly known by that name.
To provide accurate information, I need more context. Please tell me:
* What type of poultry are you referring to? (Broilers, layers, turkeys, etc.)
* What diseases are you aiming to prevent with vaccination? (Newcastle disease, Marek's disease, infectious bronchitis, etc.)
* What specific vaccination program are you looking for? (A general schedule, a specific brand, etc.)
Once I have more information, I can help you find the appropriate vaccination strategy or schedule.