Feed your backyard flock. Purina® Flock Raiser® Crumbles provide complete and balanced nutrition for healthy flocks and baby birds. Sustain an entire mixed flock of poultry, including starting and growing hens, roosters, ducks and geese. Purina® Flock Raiser® Crumbles is also for turkeys, pheasants and quail 8 weeks of age and older.