depends on your set up. Many things you can feed them to keep your levels balanced. But, It does start with good management. A healthy environment, fresh air, good food, exercise, and fresh water.i would like to what the best thing to use for deworming chickens naturally
Garlic, pumpkin and the seeds, cucumbers, and the seeds, apple cores, UPACV
I am sure many others know many other things to add to this little list.