Down here we have vet clinics at Tractor Supply usually once a month for shots and such and they do fecals as well. They give you a container and you bring it to them the next time they're there. But if you planned ahead you could have it with you, transfer it to the container, and give it back to them. They email you results in a couple days. Ours is vippetcare but there are others. I think it is $10.
You could either just grab random bits from all the different poop piles under the roosts, or lay something down, collect it all in the morning, mix it so it's homogenous, and then submit a sample from that. Or of course if you have a single symptomatic bird, you can submit just their sample, then assume if it's positive that they all are and then make the decision to treat them all out just the ones whose immune systems aren't keeping things in check. Even in the vet field there are advocates for both approaches.
You could either just grab random bits from all the different poop piles under the roosts, or lay something down, collect it all in the morning, mix it so it's homogenous, and then submit a sample from that. Or of course if you have a single symptomatic bird, you can submit just their sample, then assume if it's positive that they all are and then make the decision to treat them all out just the ones whose immune systems aren't keeping things in check. Even in the vet field there are advocates for both approaches.