I have not read this book but it appears to have a lot of useful information on sheep behavior and diet based on the experience of herders of the large pastoral flocks in France. http://www.amazon.com/The-Science-Shepherding-Michel-Meuret/dp/1601730691/ref=tmm_pap_title_0/190-6931169-1999131 Carl Fredericks www.coldvalleyfarm.com