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antibiotics Atlantic average Barred Rocks better birds breeders breeding broiler chicks brooder house brooding building cages cents chickens clean coccidiosis cockerels color consumer corn cross culling disease dozen dressed duction egg prices egg production Expt factor farm farmers feathers feeders feet females flock floor fowl fryers grade grain growers growing growth Hampshire hatchability hatchery hatcheryman hatching eggs heat hens inches increase incubator keep layers laying age laying house Leghorn litter males mash mated meat ment million pounds months nests Newcastle Newcastle disease North Central operation Pacific Poultryman pens poul poults pounds of feed problem profit protein pullets raised range ration Report retail Rhode Island Red roosts Sea Isle City season sell shell sold storage strains supply temperature tion troughs turkeys USDA vaccine vitamin vitamin B-12 weeks of age West North Central