You may say that an animal has reached maturity, but this usually means the animal is capable of reproduction. I've heard the expression "ready for market," but I think it depends on the purpose for which the animal is being sold. Even when being sold for food, the desirable condition/age of the animal varies according to the planned use.
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MrPernickety Excuse me, sir ?
Did you mean "place them between two hamburger buns" ? I'm not sure I completely understand your use of "face" in the context, in case you really meant it...I'm trying to be serious here.