The Kalmbach Feeds Henhouse Reserve Poultry Supplement is packed with top-quality ingredients to keep your flock flap-happy! This block supplement is all-natural and antibiotic-free. It’s full of yummy ingredients like whole grains and vegetables. Plus， prebiotics， probiotics， essential oils and enzymes support digestive and immune health in your feathered friends. All-natural ingredients promote vibrant egg yolks， too. This block is formulated for multiple poultry species and it won’t disintegrate in wet weather.