I read through a bunch of threads and found that cayenne pepper powder 3 tablespoons per gallon of feed will kill worms in chickens - nice and natural. And also to keep using it to protect the chickens... not to mention that the dog or other animals will steer clear of the hot stuff! Question - In my search for bulk cayenne powder at http://www.starwest-botanicals.com they list many levels of HU (heat units) and I don't know which is the best one for chickens. Do you know????