I'm not sure but if you plan to spray the weed's I wouldn't let them free-range. I don't free-range mine, but my hubby just sprayed the acreage of the weed's. He leaves the weed's close to the coop alone, and then I just get out there and use one of those stirrup hoes to get those out of there. I was pulling up weed's before to feed them, but not now since they have been sprayed.
Depends on what's in the weed killer. When I used to have an exterminator come regularly, he said to just keep the birds off it until it was dry. But for eating the eggs of the birds who'll eat weeds laced with pesticide---I had a situation where I told the weed guy to use organic---He DID NOT!! So the pesticide manufacturer (an engineer or chemist) said to be extra caution to keep them off the weeds for a month since I was eating their eggs.
Thanks. Yeah, you confirmed what I was thinking. @springvalley123 I was wondering how long I'd have to keep them off ... especially since we're eating their eggs. A whole month - wow. I better look into some other alternatives.
My husband was considering torching the weeds but that uses a bit of propane. Might need to reconsider that option after all. I can't imagine leaving the girls confined for a whole month.