Think about it. Worms weaken the chickens immune system by starving the bird to death, literally. Chickens with loss of strength and compromised immune systems opens the door for bacterial, viral and fungal infections to easily invade their systems.This is what I have read and is why I'm opting for the chemical route. I'm all for natural when it comes to food and insecticides, but when it comes to highly contagious viruses, bacteria and internal parasites, I want what's guaranteed to be effective.
You want to use something that you know works; without guessing whether the product will be effective or ineffective, no guesswork about dosages or how long to give the product. No guesswork whether there's a withdrawal period or not, and of course the costs of the product(s.)
No guesswork using chemical wormers.