in new zealand all sheep meat falls into a specific category
Sources
http://en.wikipedia.org/wiki/Lamb_and_mutton
# Ram (also called a tup) — a male sheep.
# Ewe — a female sheep
# Mutton — an older female sheep (sometimes goat meat )
# Wether — a castrated male sheep.
# Hoggett (or Hoggatt) — no longer a lamb, but not yet mutton. ie having no more than two permanent incisors in wear
# Teg — a sheep in its second year.
# Lamb — a young sheep, under 12 months of age which does not have any permanent incisor teeth in wear, generally unweaned
* Slink — a very young lamb.
* Baby lamb — a milk-fed lamb between six and eight weeks old
* Spring lamb — a milk-fed lamb, usually three to five months old, born in late winter or early spring and sold usually before July 1st
* Sucker lambs — an unweaned lamb — includes young milk-fed lambs as well as slightly older lambs up to about 7 months of age which are also still dependent on their mothers for milk
* Old-season lamb — a lamb a year old or more.
* Yearling lamb — a young sheep between 12 and 24 months old.
* Salt marsh lamb— the meat of sheep which graze on salt marsh in coastal estuaries that are washed by the tides and support a range of salt-tolerant grasses and herbs such as samphire, sparta grass, sorrel and sea lavender.