Flock
Flock(1) As applied to breeding. All poultry of one kind of mating (breed and variety or combination of stocks) and of one classification on one farm; (2) As applied to disease control. All of the poultry on one farm except that, at the discretion of the Official State Agency, any group of poultry which is segregated from another group and has been so segregated for a period of at least 21 days may be considered as a separate flock.