As somebody who grew up on a cattle farm this sounds like bull $hit to me.
I liked this quote from it "I'd like to challenge the people that came up with this information to enclose yourself in a shop with a cow, and at the same time have someone enclose themselves in a similar shop with a car or truck running," one critic, Steve Hofman of Ripon, Calif., wrote to the Modesto Bee. "Then let me know the results."
http://www.latimes.com/news/science/enviro...0,6563166.story