So they are doing better today? That's good!My girls are doing great this morning, even yesterday evening they were taking a dust bath with all the others ! I live in Europe so I don't know if that product is available here but my father is looking for solutions. I will have to be monitoring carefully the next few days cause they are going to be very hot. The blue one's crop does feel more full than others. They don't have access to grit so I'll change that as soon as possible. I'll try what y'all said thank you so much for your help !
I'd work on getting rid of the bugs. You likely have different products, so look for Pestene or similar. Ask at your feed or pet shop to see what they have to treat lice/mites on birds.
Re-check their crop first thing in the morning before they have eaten or drank anything. The crop should be empty or float. Checking during the day when they have been eating/drinking it's hard to gauge function.
Hopefully they were just having a hard time with heat. Do provide them with access to deep shade and cool water when it starts getting hot, this may help them a lot.
I see what you're saying. Yes, grit is helpful in processing corn and grains so it's possible that these can cause issues. If a crop is impacted or slow moving, then eliminating corn/grains and harder to process foods for a short period of time is helpful if treatment is needed.This thread is about the OP's birds getting sick. I think we're getting a bit side tracked here. I agree, it does depend on may factors, epically the quality of the land and space they have.
I realize that my wording was incorrect. What I meant to say is that dried corn can cause crop impaction if chickens consume it without access to grit. I may be mistaken about you posting this, but will see what I can find.