1. The “new perception” of animal agriculture: legless cows, featherless chickens, and a need for genuine analysis. Fraser;Fraser;J Anim Sci,2001
2. Animal machines: the new factory farming industry;Harrison,1964
3. Report of the technical committee to inquire into the welfare of animals kept under intensive livestock husbandry systems (reprinted 1974);Brambell,1965
4. Five Freedoms of the Farm Animal WelfareCouncil. http://www.fawc.org.uk/freedoms.htm. Date of access: 17 July 2006.
5. The somatic marker hypothesis and the possible functions of the prefrontal cortex;Damasio;Philos Trans R Soc Lond B Biol Sci,1996