I brood my chicks in metal horse troughs, and today while hosing one out and preparing it for use this spring, I noticed a red, crusty film covering the bottom of the tub....Rust. So my question is can rust hurt chickens? If they scratch it up or cut themselves and step on it? I know we get tetanis (spelling??) shots if we get an open cut and then come into contact with rust, but what about chickens?? I really don't wanna have to throw this trough out, but I don't want my chicks getting sick and dying, either.