I don't know about it killing turkey's. Maybe it does maybe it don't. All I know is chicken litter is spread on most fields where I grew up in central NC. Poultry industry is huge. But yet their are more turkeys in that area than ever before.
The biggest problem with chicken litter is not only will it make your intended crop grow, it will also bring out every weed in the seed bank. Been around chicken farms and chicken litter for my whole life. Never saw it kill of much of anything.