A complete ration designed to promote optimum fertility, embryo development, egg production and chick vigor in all species of game birds. It is formulated to support fertility, embryo development and egg production for all game birds. Purina Pro Plan TRUE NATURE Adult Turkey and Rice Recipe I think 32% fish chow is too high for chickens, though. Purina game bird chow layena . Purina ® game bird breeder layena ® feed is specifically designed to meet the special dietary requirements of breeder hens. It is recommended that you feed game bird layer from one month prior to start of egg production until birds are out of egg production. Purina® game bird maintenance chow is offered in a crumble feed form. Game bird maintenance chow is a complete feed for maintaining shooting preserves and breeding birds. Game bird maintenance chow is a complete feed for supporting egg production, fertility, and hatchability. Can be fed to adult female chickens, ducks, geese and turkeys of laying ...