YIKES.....back away from the scratch! It is 25% of their daily feed. They should be on layer(if laying) or start and grow (for youngers)
Bread has no nuitritional value......i never give mine bread. It is worthless
You need to read up on feeding your flock. Scrath is a TREAT not food! They will over heat in the summer when given to much of it. They also get fat and don't lay eggs as well.
I put 1/4 ratio in my feeders
Please change their diet ASAP, they will recover and be just fine! Also , plain yogurt will help with runny poo. Iy is a pro biotic and helps with digestion. JUST stand back after you give it to them. they LOVE it and sling it everywhere, LOL.............