8BrambeI1 F W R. Report of the Technical Committee to En quire into the Welfare of Animals kept under Intensive Hus bandry Systems[M]. London Command 2836. HMSO,1965 13.
9Dawkins M. From an animal's point of view motivation, fit- ness, and animal welfare[J]. Behav Brain Sci, 1990,13: 1-61.
10Broom D. Animal welfare defined in terms of attempts to cope with the environment [J]. Acta Agric Scand Supl, 1996,27: 22-28.
