Ms. Moore provides a wealth of information here not given in most "chicken how-to" books. To clarify my perspective, I am NOT anti-medical establishment, but I DO look first to natural remedies - not expensive "herbal" or "natural" products but rather I forage for weeds, grow some medicinals in my garden, etc., make my own simple tinctures, poultices and infusions. With my family & children this has worked very well. It is cheap and usually better quality than anything you can buy anywhere. We would not hesitate to see our family practice doctor if necessary, but we really don't see him very often (maybe every few years?) as I am usually able to clear up any issues that arise.
We will be raising chickens soon, and I absolutely LOVE the section on this book on caring for and preventing common chicken maladies by incorporating various herbs in bedding, feed, water, and even topically on the chickens. Both acute treatment and tonic nourshment are covered. I can guess what you're thinking, so know that I am NOT against culling when necessary, and in fact "spent hen" is one of our favorite ingredients. However, I do believe the animals whom we have been given dominion over should have plenty of access to sunshine, fresh air, fresh green food, and be slaughtered humanely when the time comes. I believe this so strongly that I actually learned to slaughter chickens so that I could be sure to do it with the least amount of trauma to the birds (and yes, it can be done). At any rate, just as I would not subject my family to conventional drugs as a first line of defense, I am happy to find the info here to provide our chickens with natural health.
There is also a nice section on hatching out chicks under a natural mother (novel!) and also alternatives to conventional feed. I am not a fan of GMO soy or corn in my family's food and we make quite an effort to minimize their presence in our diets - so likewise I am looking to reduce or eliminate these ingredients in our food's food, so to speak.
You will need to do more research on housing, but libraries and the internet are full of great ideas. I found "Fresh-Air Poultry Houses" to be very enlightening and a real stand-alone resource on the subject of chicken housing. Joel Salatin's books also cover deep litter technique in detail which is another way to allow for good air quality with the added advantage of enriching your soil.
The big value in "Backyard Poultry Naturally" is in the sections on remedies, natural brooding, and alternatives to conventional feed. You will not find these topics covered in the other chicken books. If you are like me and try to do things yourself, with fresh ingredients either grown or foraged, then you will find this book a necessary addition to your library.