I know a guy that has gineas and chickens with his deer. He has large pens with lots of grass and clover, he hasn't had any problems with the deer getting sick yet and I think what helps him is his large pens. It gives the deer and chickens room to spread out and not be concentrated in a small muddy space. Anytime you have good healthy grass in the pens, you will naturally have a lot less bacteria than a pens that's tramped to the mud because the grass helps absorbs some of the deer waste. However there is always still a risk when you put any poultry in, especially if they are getting into the deer's feeder and making messes around the feed. I have been thinking about adding a few turkeys to my deer pens, but I am afraid the turkeys will attract attention from foxes or coyotes, or neiborhood dogs. So that's why I don't have any in my pens.
