100% complete daily nutrition - Purina® Layena® layer feed provides the right balance of nutrients, vitamins and minerals your backyard hens need.|Research-proven feed - Purina® has been conducting poultry research for nearly a century. We have a flock of backyard birds at the Purina Animal Nutrition Center to help our nutritionists, feed formulators and flock caregivers evaluate our feeds before we put them on the market.|Oyster Strong® system - Oyster shell, Vitamin D and manganese for strong shells. Large-particle calcium breaks down steadily, making it available during the entire egg formation process, especially at night when birds aren’t eating, and eggshell development is critical.|Rich yellow yolks - Added marigold extract produces deep, yellow egg yolks.|Fertility and feathering - Enhanced with lysine, methionine amino acids and key levels of Vitamins A and D to help hens produce plenty of eggs and grow beautiful feathers.| Healthy immune system - Rich in antioxidants and optimized levels of Vitamin E. It also contains prebiotics and probiotics to support immune and digestive health.