Lambs are rather complicated as a meat animal. They sell best for meat in Spring, but that is also when they are born. When the lambs are small/young, they just don't have enough meat to be worth butchering and they wouldn't be worth very much. Lambs grow quite well and quickly just on mom's milk animal rend grass, so it's more profitable to raise them out, than to butcher them.
Even veal isn't that "small". They are typically butchered at 450# or more. They get to live longer lives than cornish chickens. And cornish game hens are slaughtered even younger than those.
Thanks for all the info
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