During the process of domestication pigs have been gradually adapted to man and to the environmental conditions man provides. This resulted in clear differences between the wild boar and the various modern pig breeds that are currently used for pork production, not only for exterior and production related traits, but also for behavioural traits. Domesticated pigs are, for example, generally calmer and less sensitive to changes in their environment (e.g. Špinka et al., 2000; Price, 1999). It is usually assumed that domestication has resulted in pigs that are better able to cope with pig husbandry systems and, therefore, have a better welfare than wild pigs would have under the same conditions (Price, 1999). 

E. Kanis, K. H de Greef, H. van den Belt, A. F Groen, J. Schakel

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 14, , 14.09, 2002
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