When a sheep is between 6 and 10 weeks old, its meat is called baby lamb. When a sheep is between 12 and 20 months old, its meat is called yearling mutton or hogget. There are different cuts of meat, such as saddle, leg, loin, shoulder, breast, and shank.
In the U.S., meat is given a grade based on how good it is. Lamb meat is graded as prime, choice, good, utility, or cull, with prime being the best and cull being the worst. Mutton meat comes from a full-grown male or female sheep and is graded as choice, good, utility, or cull.