Oh wow I believe those may be broilers. I have never seen a chick grow like that. But I have not had broilers. Personally I would sell them off as soon as weaned off heat and say they could be broilers to the buyer as if they are, keeping them to a full long life is painful for them I have read (we don't butcher our chickens). If you butcher your chickens then you don't have a problem. (But I am not sure at all if they are broilers- disclaimer!)
You will probably know without a doubt by 6 weeks of age if they are, I am guessing!
If you want to go buy more chicks to add in with these so you have more layers and they all get along, I have found that 2 weeks is the maximum age separation (so day olds put in with 2 week olds) that works from my experience. Putting day olds in with three week olds doesn't work for me.
So you may want to consider running out and getting some more layer chicks if you are going to maybe sell these off. But if they end up not being broilers then you may have too many chicks.
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