Welfare problems caused by transport result from the response of the a
nimals to the various stressors that impinge upon them during transpor
t and lairage. The stress response depends on the animal's perception
of an environmental challenge as being stressful and is subsequently a
ffected by individual differences. Therefore, when looking at the effe
cts of transport and making recommendations to safeguard the welfare o
f animals, both the transport conditions and the type of animals being
transported should be considered, Extensively farmed animals may pose
a particular problem because the term 'extensive system' includes ver
y different farming situations, resulting in animals that are likely t
o be very diverse in their response to stressors. This is further comp
licated by the great variety of breeds used in these systems, particul
arly across different countries. In view of this problem, the importan
ce of skilled and welfare-concerned stockpeople, handlers and drivers
is greater than ever. Research on basic and methodological aspects rel
ated to individual differences in response to stressors would give wel
fare benefits in the long term.