Hi, I am brand new to this site and chickens! I have horses and am introducing chickens who will free-range with my horses. I am especially interested in the chickens eating things from fresh poop (like undigested corn) and the manure pile....do I need to dispose of horse manure off the property if the horses have been wormed and/or have had antibiotics? I use a feed through fly reducing product and called the company about introducing chickens, they said they use the same ingredient in a similar product for chicken but had no research on chickens raised with horses on their product or visa-versa..... I am still nervous about eating the eggs? Thanks, in advance for any help!