Finding "natural husbandry" in one book is kind-of hard to find.
Some of it is learned through trying to think of how an animal would be living if they were on their own in "the wild" and trying to emulate that as much as you can. I've learned so many things from articles all over the place including a general knowledge of confined feeding operations and what happens when pharmaceuticles are added to the mix, etc. I read and am a member of Weston A. Price foundation that is excellent education in a wide range including animal health and nutrition, study of traditional diet throughout the world, building the immune system naturally, etc. Some of Joel Salatin's books really get you thinking. There are also books on the specific use of herbs in animal husbandry and "medicine".
That being said, I have one book I really like, and another I use as a basic reference.
My favorite so far:
http://www.amazon.com/The-Small-Scale-Poultry-Flock-All-Natural/dp/1603582908
You can look at his website and see if the contents would be something you're interested in. Many of the articles included in the book are here:
http://www.themodernhomestead.us/article/Poultry.html Scroll down to the bottom of the page for the article links.
I also have Storey's Guide to Raising Chickens. NOT NATURAL for the most part, but a good, broad reference.
If you like a more "urban/trendy" type reading that has some tips for natural things, herbs, etc., there's the Fresh Eggs Daily book. It tends to be a bit "girly" (curtains on the nest boxes for example
) ...written by someone who I think was a city person that moved to a place that she can keep horses, etc. (I won one of these in a contest on a blog...probably wouldn't have purchased it but since I won it, I read through and it has quite a few good ideas in it for various things.)
