High level of xanthophyll a coloring agent derived from marigolds produces deep yellow egg yolks Oyster Strong System with calcium manganese and trace minerals for strong shells and additional source of calcium Essential amino acids enhanced with lysine and methionine to give birds nutrients they need to produce plenty of wholesome and delicious eggs; also promotes beautiful feathering High level of vitamin A and D to help birds grow into healthy adult birds Prebiotics probiotics and yeast support immune and digestive health Simple ingredients with no artificial by-products or fillers added; no artificial preservatives added and no antibiotics or growth hormones added 16% protein complete and high-calcium ration Ideal for top-producing laying hens once they reach 18 weeks of age Larger particle size than limestone so oyster shell will stay in the digestive tract longer Comes in a 50 lb. chicken feed package Chicken feed is available in pellets or crumbles Available in 10 lb. 25 lb. 40 lb. and 50 lb. bags 100% complete daily nutrition provides the right balance of nutrients vitamins and minerals your backyard hens need 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