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Fascinating! So either it's possible that cocci can exist in the intestines of chicks in the shell (wow!) or the brooder may have been contaminated from another source...airborne particles coming in the window, for example.
Exactly, elmo. If you bring in dirt on your clothes or shoes...
They can get cocci in the brooder, though it's not that common. Yard full 'o Rocks just lost an entire batch of Columbian Rock chicks in the brooder and a necropsy confirmed coccidiosis. It's possible.
You can get Corid or Cocci-Rid powder online, yes, no scrip needed. Jeffers Livestock Supply, First State Vet Supply, and some hatcheries should have it. Maybe one of our sponsors does. I'm not sure what treats necrotic enteritis--I was under the impression it was the next step in a bad cocci...
You know, in spite of the clean coccidiosis test, if it was mine and I was seeing bloody poop, I think I'd treat it with Corid anyway. It's not an antibiotic and shouldn't hurt them to do a round of it. Other than cocci, necrotic enteritis and worms are all I can think of that cause bloody poop...
No, you didn't do any damage by giving mealworms, so don't worry about that. When there is a sour crop issue, they just don't need anything that has to be ground up. I've been told by someone who is a long time chicken keeper to put copper sulfate in the water. I'm looking for some to keep on...
Sometimes they shed some intestinal lining that looks pinkish. The Metro stuff is anti fungal, I believe, which is probably for the crop. Is it actual blood or just pinkish?
Sounds like sour crop, the gassy feeling it has. You have to withdraw food for 24 hours, give water with unfiltered apple cider vinegar (changes the pH in the crop), then start with plain yogurt (nothing with sugar), then scrambled eggs--nothing her crop has to grind up. Massage it carefully...