As someone whose family has raised hundreds of chickens - there are chickens raised for egg laying and chickens raised for slaughter - the later are commonly referred to as "Meat Birds" and have been referred to that way at least as far back as the 80's when we started raising them.
Meat birds are raised in a single season (we could get two batches in a year) and have more tender meat due to the rapid growth (and growth hormones) versus an egg-laying hen 2+ years old that's naturally hit a slaughter weight.
I know, we used to raise chickens too. It's still amusing to me.
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