Research proven feed Purina® has been conducting poultry research for nearly a century. We have a flock of backyard birds at the Purina Animal Nutrition Center to help our nutritionists, feed formulators and flock caregivers evaluate our feeds before we put them on the market.|Mixed flock treat Complement the complete feed of laying chickens, ducks, geese and turkeys.|Shell quality Contains oyster shell for added calcium.|Backyard happiness Solid grains encourage birds’ natural pecking instinct, to keep them entertained and enrich the coop.