Mark Purdey animal feed dates back to at least 1926. In the 1970s attention was directed within MAFF to the danger that this practice would result in the spread of infectious diseases. The diseases considered were those caused by conventional viral and bacterial organisms. No consideration appears to have been given to the risk that scrapie might be recycled in sheep, or even transmitted to other farm animals. This may seem surprising. The answer probably lies in the fact that half a century had elapsed without any indication that animal feed containing ovine protein was infecting sheep or any other animal." Purdey
Animal rights Linzey at Trinity College, Cambridge, in August 1977. This was followed by Mary Midgley's "Beast And Man: The Roots of Human Nature" (1978), then "Animal Rights–A Symposium" (1979), which included the papers delivered to the Cambridge conference. From 1982 onwards, a series of articles by Tom Regan led to his "The Case for Animal Rights" (1984), in which he argues that nonhuman animals are "subjects-of-a-life", and therefore possessors of moral rights, a work regarded as a key text in animal rights theory. Regan wrote in 2001 that philosophers had written more about animal rights in the previous 20 years than