Dying chickens. What could it be?

[Wildwilly07]

15 week old chicks I hatched this spring. I’ve lost 4 (almost 5) the past 2 weeks. Slowing down/dying the same way. Off balance, still eating & drinking, pale comb, laying down a lot, one even came into the garage and laid down by my feet. Treating for coccidiosis (day 3). The odd thing is it’s only the chicks dying not the 8 (2 year old) hens or 18wk silkies….they all free range together. I am giving them grower feed & they do eat some laying food from the others. Brand new bags but thinking about throwing away as they are all dropping dead? Ive checked for lice & mites and haven’t seen anything. Can I give straight corid to the hen that is going downhill? Pic of the sick chickens poop, the second white poop is from the chicken that died (last photo) almost looked like something was in its throat?

 

[Wyorp Rock]

Here's your other ongoing thread where you have more replies.

It would be good if you can post Current photos of the current poop and sick chicks.

https://www.backyardchickens.com/threads/14-week-old-chick.1541016/page-2#post-26029062