I picked up a new batch of chicks on Saturday. I am feeding them Dumor chick starter feed from tractor supply. I also got an young silkie from the same place also on the starter feed. I noticed today when I was changing out their shavings that several of them along with the silkie have reddish brown runny poo. What could be causing this? The silkie doesnt always have runny poo but there were several patches along with when I moved her while i was cleaning she dropped a runny load. It smells like dog poo if that matters.