4Bradshaw RH. , et al. Behavioural and hormonal responses of pigs during transport: effect of mixing and duration of joumey [J]. Animal science,1996, 62:547-554.
5Sybesma W. , Koolmeesang PA. , Vander DG.. Meat past and present:research , production , consumption , TNO Voeding , Zeist[J]. Netherlands, 1994, (2) :89-92.
7Bradshaw R H, et al. Behavioural and hormonal responses of pigs during transport:effect of mixing and duration of journey[J]. Animal Science, 1996b, 62:547 - 554.
8Perremans S. Influence of vertical vibration on heart rate in pigs[J]. Journal of Animal Science, 1998 (76) :416 - 420.
9Broom D M, et al. The effects of producton efficiency on animal welfare in biological basis of sustainable animal production Proc. 4th Zodiac Syrup. EAAP Publ. 1994 (67). Wageningen: Wageningen Pers. pp. 201 - 210.
10Weary D, Fraser D. Partial tooth-clipping of suckling pigs: effects on neonatal competition and facial injuries [ J ]. Applied Animal Behaviour Science, 1999,65:21 - 27.