Most weed killers are two week minimum. I wouldn't risk it. And i would wait until the young chicks are at least 6 weeks before mixing them with the older ones and even the you should supervise.
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Well always give it a couple of weeks to brake down and after the weeks start to die you can dilute the area with water but I have learned the hard way with poultry as they are really sensitive to not spray around them and just pull the weeds or scrape them out but it is worth the effort to do a little work and not loose to a spray of some kind ....