The Purina 57282 Layena Crumbles Premium Layer Laying Hen Feed is formulated with the optimum nutrition for healthy birds and nutritious eggs. The layer laying hen feed is a 16% protein and high-calcium ration formulated with prebiotics, probiotics and yeast for top-producing laying hens once they reach 18 weeks of age. This laying hen feed also includes our Oyster Strong System for strong shells and an additional source of calcium when the hens need it most.