Gain Weight Horse Supplement by Cox Laboratory contains 40% crude fat and dried Lactobacillus for quick and easy digestibility. Gain Weight supplies levels of essential nutrients and amino acids frequently lacking with grains and hay grown in mineral depleted soils. Cox Labs Weight Gain enhances skin and coat and muscle tone while lowering risk of colic. Improves endurance and supports healthy growth in young horses. The 10-lb Refill Bag lasts 40 days when fed at 4 oz per day for horses under stress or higher activity levels and 80 days when fed at 2 oz per day for skin and coat maintenance.