Revalor� XS is a growth promotant with a slow release of its active ingredients that increases the laying down of lean meat without increasing fat deposition. Registered under Reg. No. G3925 (Act 36/1947), it is intended for use in cattle only. When administered once to steers and bulls fed in confinement for slaughter, it increases weight gain and improves feed efficiency for up to 200 days. Each implant contains 200 mg of trenbolone acetate and 40 mg of 17�-oestradiol. It must not be used in pregnant, lactating, or breeding animals, nor in calves intended for veal production. A cartridge consists of 10 implants, each made up of 10 small tablets, and a single implant is placed under the skin using a special implanter according to the implanter instructions.