Surely feeding chicken faeces to cattle must risk spread of infection?

FDA urged to ban feeding of chicken feces to cattle
Food and consumer groups say the practice increases the risk of cattle becoming infected with mad cow disease.
A fight is brewing over the practice of feeding chicken feces and other poultry farm waste to cattle. A coalition of food and consumer groups that includes Consumers Union and the Center for Science in the Public Interest has asked the Food and Drug Administration to ban the practice.
Read article in the Los Angeles Times (USA)

Personally, I don't see how anyone could ever come up with the idea of considering a bacteria-laden waste product a suitable feed for animals.