I don't think it a Mille. Mine are 7 weeks old and have only a few spots. Course i could have oddballs seeing as a few other posters say theirs got spots almost immediately.
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Also, the two that the legs were bad on, I put them in w/the baby cornishx and withheld feed over night the past 3 nights...they are standing and walking
One gets a tiny shakey yet but their legs seem to be catching up to their bodies & weight so I am HAPPY I did not put them down and will see how it goes, day to day. All my cornishx and those two go out into a coop tomorrow to prepare for the next shipment to arrive sometime next week of 15 RIR pullet chicks and 15 cornishx chicks.