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Leghorn roosters are often given away free because it takes feed to raise them and they never really get to a size or proportions most people expect for eating. A leghorn carcass will always look more like a rubber chicken than a broiler cross, it is just how they are built.
We butcher non-broiler-cross cull birds as young as 8-10 weeks, but they will be small with no appreciable breast meat. So we cook two where one 5week old broiler would have served.
We more often go to 20 weeks, but we have them on pasture to reduce feed costs and this can slow rate of growth.
We tend to use such birds in long cooked dishes or soup, etc. They just don't look as we are used to when roasted. But they are still VERY tasty.
If you have no use for the packing peanuts and are of the frame of mind that they have served their purpose already, you could cull them immediately to not waste feed on them. I have known people to do this, as it is often not cost effective to raise such birds for meat on purchased feed. Just make it quick and as humane as possible for them if you decide on this route.
It is hard to do, as chicks are so cute and full of personality.