Taken from "Sheep Raising 101"
Early Weaning
Early weaning is a relative term, but implies weaning at any time after 21 days of age, but usually before 90 days. 60 days is a common weaning age in intensively managed sheep operations. Early weaning can be successful provided lambs are drinking water and consuming adequate amounts of feed. Creep feeding is essential to an early weaning program.The size of the lamb at weaning is generally more important than its actual age. As a rule of thumb, most lambs can be weaned at 60 days of age or 45 pounds, whichever comes first (though this will vary by breed).