Purina^® Layena^® layer feed provides all 38 nutrients laying hens need once they?re 18 weeks old and laying eggs. Feeding Purina^®Layena^® layer feed to your hens provides you with delicious and nutritious eggs that your family and community can enjoy. The exclusive Purina^® Oyster Strong^® System strengthens eggshells with added calcium from oyster shells, Vitamin D and manganese. Our Crumbles are wholesome and balanced, supporting reproductive and overall health with no need to supplement.