chick treats?

[Onyxflock]

I have plenty of hay so expect I could give them a bit in their brooder to play in. I am in East Tennessee and right now all we have is mud but when it dries out I wonder if I could give them some of the composted dirt that was made from horse manure, pine shavings and vegetable waste? I realize you said no poop, chicken or pet waste but does composted horse manure count