Help! First Time Chicken Owner Sick Baby
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There is no picture.
We need a bit more info in order to help you.
Post photos of what you saw, of your brooder and chicks - tell us about it.
What type of food/treats are you feeding?
What symptoms if any are you observing, how are the chicks acting, are they eating/drinking/pooping, etc.
Yes, if they have bloody poo then treat them with Corid.
Dosage for Cocci is 1 1/2 teaspoons Corid powder per gallon or 2 teaspoons of 9.6% Corid liquid per gallon
Give for 5-7 days - make sure this is the ONLY water available during that time period. Mix a fresh batch at least once a day.
Let us know how they do.
I would wait until they finish the Corid, then you can give some probiotics or plain yogurt, also some poultry vitamins as well.
As far as the other chicks in a separate brooder, the Corid won't hurt them if you decide to treat. You may want to practice good biosecurity between brooders to avoid cross-contamination. Using separate tools to clean out each brooder, washing hands before handling the different chicks, etc.