A: Each bag of Purina Poultry feed is supported by strong research and successful trials. Before a new feed is offered to our customers, we perfect the recipe at our nutrition center. We know our feeds work, because we feed them to our own flock. Each day, we measure several things - all with the goal of providing the best nutrition to our flock: Feed and water intake Egg production Egg nutrients Shell strength Egg white and egg yolk quality Overall bird health and performance All told, our research is supported by nearly a century of poultry studies. Chickens and other poultry have been a vital part of Purina research since 1926. In this time, we’ve conducted more than 5,700 poultry studies with the intention of delivering the best in nutrition, quality and value to help you keep your birds happy and healthy.