ReptileMom, this works good if you can pick up your feed at night and have an area that the chickens can't get to. After you pick up the food, put a bucket (2 1/2- 3 gal works good) full of dry oatmeal for a night or 2 to get the mice used to eating in it. Then after the mice know they are getting food from the bucket, fill it just over half full of water and sprinkle oatmeal over the top of the water, the mice will go to eat, fall in and drown. Then you can feed them to the chickens if you want, or just bury them.
Any chance your hubby put poison out for the mice and the roos ate either the poison or the mice that ate the poison? It doesn't take much of that stuff to kill a chicken. If you find any of the little baby mice, feed them to the chickens, they love them.
My cow had her calf yesterday, a little bull calf. I was hoping for a heifer, but both Mom and baby are doing well and that's the most important thing. I took some photos, but my camera battery died and I forgot to buy one when I was in Billings today.