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Lamb in Britain is called lamb if itâs marketed in the year of its birth (or in the year following its birth if the lamb is born after 30 September). After this, it becomes known as hogget or old-season lamb. Only when the animal has its first permanent incisor tooth (at around 1-1½ years) will the meat from it become known as mutton. However, the majority of mutton comes from breeding animals that have reached the end of their productive contribution to the flock. Although early-season lamb is very tender, the meat from older animals will have developed more flavor.
