Solitude IGR Feed-Through Fly Preventative by Zoetis is an insect growth regulator that inhibits development of the exoskeleton in immature house and stable flies, preventing them from becoming adults. Solitude IGR is a feed through fly preventative which, when mixed 1/2 ounce into a horse's ration daily, will prevent house and stable flies in and around horses, horse barns, stables, paddocks and race tracks. Product Details: To maximize the effectiveness of Solitude IGR, horses must be fed individually. Made from alfalfa, Solitude IGR pellets are top-dressed onto grain or mixed with the horse's total ration to provide 300 mg (1 scoop) of cyromazine per horse per day. 640 Day Supply Daily dosage: 1/2 ounce scoop of Solitude IGR per day, no matter the size or weight of the horse