Implanting suckling steer calves with 12 or 15 mg. DES (not to be implanted within 120 days of slaughter) and heifer calves with 36 mg. RAL (not to be implanted within 65 days of slaughter) at marking and branding time is practical and clearly economical. Implanting costs less than $1.00 and will result in 10 to 30 additional pounds per calf at weaning without adversely affecting slaughter cattle given the usual growth stimulants during the finishing period. DES and RAL are available from veterinary product suppliers.