Purina® Start & Grow® includes the optimal combination of the 38 nutrients chicks need to grow and develop into happy, healthy hens. Purina® Start & Grow® Medicated provides optimum nutrition for raising laying chicks from hatch to laying age (18-20 weeks). This complete feed with 18% - protein and quality nutrients is perfect for a strong start and early hen development. Formulated with prebiotics and probiotics to support optimum digestive health and immune function. Purina® Start & Grow® Medicated feed includes all the same nutrients as Purina® Start & Grow® Non-Medicated feed and also includes amprolium. Amprolium helps protect chicks from coccidiosis.