Chickens can pick up a lot of hitch hikers during their lives, fleas, ticks, worms, but lucky for us the solutions to these problems are cheap and easy to deal with, if you have famers knowledge, Diatomaceous Earth is a good solution to all these problems an its nothing more than ground up fossil dust, for worming birds use 1 tablespoon per bird in their food 2 times a year, and for fleas a pan of this dust or a combination of cool wood ashes and diatomaceous earth for them to dust in will allow them to do all the work themselves, Using waste vegetables to supplement their diets, is a great way to have healthier eggs and birds, consider another cheap source of chicken protein Marijuana waste, fresh leaves provide a great source of nutrition and also make your birds feel great, none of my chickens have stopped working to go to protest rallies and I'm sure there must be a slight trace of CBD (that's canabinadiol for newbies) in the eggs themselves, many people would be happy to give these leaves away, keeping a clean coop is also fundamental to health, try using local grass cut with a machete as hay, I cut mine and make rolls I stack in the top of my coop