http://www.outoftheearth.com/petfood.htm"Transmissible spongiform encephalopathy (TSE) carried in pig- and chicken-laden foods may eventually eclipse the threat of "mad cow disease". The risk of household pet exposure to TSE from contaminated pet food is more than three times greater than the risk for hamburger-eating humans."
BSE & TSE gives me the willies.... It's a good thing my sheep & bison eat only grass, that we know has never been fertilized nor sprayed.