It is thought that the truck which was attached to the trailer had a brake defect which caused a tyre to blow out and started a fire.
The driver, a 40-year-old Romanian, stopped the vehicle and detached the trailer but by the time the fire brigade arrived the trailer was fully ablaze.
The surviving chickens were transferred to a second truck and the dead birds were disposed of. Part of the motorway was closed for four hours for a clean-up.
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