References

1 Agricultural textbook, Scientific Farm Animal Production, 1998.
2 Peter Cheeke, textbook Contemporary Issues in Animal Agriculture (Interstate Publishers, 1999).
3 Feedstuffs, January 1, 2001, pp. 8, 18.
4 Br Poultry Sci, 1989; 30:479; Diseases of Poultry, 1997.
5 Bernard Rollin, PhD. Farm Animal Welfare (Iowa State University Press, 1995).
6 USDA, Animal Welfare Issues Compendium, September 1997.
7 Agricultural textbook, Scientific Farm Animal Production, 1998.
8 Peter Cheeke, textbook ,Contemporary Issues in Animal Agriculture (Interstate Publishers, 1999).
9 Scientific American, 8/99; Animal Waste Pollution in America (report released by Senator Tom Harkin, 12/97).
10 United Nations FAO, Livestock’s Long Shadow: environmental issues and options, 2006.
11 Peter Uvin, The State of World Hunger, reported by UN FAO, 1993. Percentages by calories. (PDF)
12 J of ADA, 1997; 97 (No. 11): 1317-21; Am J Clin Nutr, 1999; 69: 727-36.
13 ADA, Position on Vegetarian Diets, 2009 (PDF)