Cornish X Rocks, Roasters, Turkeys, and other heavy breeds of chickens have astounding growth rates, but if managed incorrectly, this rapid growth can sometimes cause health problems. Broiler Booster contains Vitamin A, D, E, B-12, electrolytes, and biotin, which really works to counteract weak legs. When added to your chicks water, it will result in healthier, stronger birds. If you are ordering broiler-type birds, seriously consider giving them this fine product. You should notice a difference! For a flock of 50 chicks a 4 oz. package should last 7 weeks. Larger quantities found above. Shipped with baby poultry.