Peter Singer-Animal Liberation

6. F.D. Thornberry,W. O. Crawley,and W. F.Krueger,
   “Debeaking:LayingStocktoControlCannibalism,”Poultry
   Digest, May 1975, p. 205.

7.AsreportedinTheAnimalWelfareInstituteQuarterly,Fall
1987, p. 18.

8. Reportof theTechnical Committeeto Enquireinto the
   Welfare of Animals Kept Under intensive Livestock
   Husbandry Systems, Command Paper 2836 (London: Her
   Majesty’s Stationery Office, 1965), paragraph 97.


9. A. Andrade and J. Carson, “The Effect of Age and
   Methods of Debeaking on Future Performance of White
   LeghornPullets,” PoultryScience 54:666–674 (1975); M.
   Gentle, B. Huges, and R. Hubrecht, “The Effect of Beak
   Trimming on Food Intake, Feeding Behavior and Body
   WeightinAdultHens,”AppliedAnimalEthology8:147–159
   (1982); M. Gentle, “Beak Trimming in Poultry,” World’s
   Poultry Science Journal42: 268–275 (1986).


10. J. Breward and M. Gentle, “Neuroma Formation and
    Abnormal Afferent Nerve Discharges After Partial Beak
    Amputation (Beak Trimming) in Poultry,” Experienta 41:
    1132–1134 (1985).


11. Gentle, “Beak Trimming in Poultry,” World’s Poultry
    Science Journal42: 268–275 (1986).

12.U.S. Departmentof Agriculture Yearbook for1970, p.
xxxiii.

13.Poultry World, December 5, 1985.