The objective of this study was to record a range of variables that might be involved when transporting pigs under
commercial conditions. It was found that temperatures below 5°C (especially when there is no bedding in the trailer) and above 20°C, journeys lasting 30 minutes to four hours, waiting times at the processing plant longer than four hours, journeys during October, November and December, and transporting trailer loads of pigs of both sexes were all factors that could adversely affect the welfare of pigs being transported to slaughter.

For more information the full article can be found at http://veterinaryrecord.bmj.com/content/by/year