Nature   
Volume 507 Number 7490 pp8-134  6 March 2014
http://www.nature.com/nature/current_issue.html

Nature | Comment
Agriculture: Steps to sustainable livestock
Mark C. Eisler, Michael R. F. Lee, John F. Tarlton, Graeme B. Martin, John Beddington, Jennifer A. J. Dungait, Henry Greathead, Jianxin Liu, Stephen Mathew, Helen Miller, Tom Misselbrook,
Phil Murray, Valil K. Vinod, Robert Van Saun & Michael Winter
05 March 2014
With improved breeding and cultivation, ruminant animals can yield food that is better for people and the planet, say Mark C. Eisler, Michael R. F. Lee and colleagues.