Sheep truck temperature 'like an oven'
The BBC has uncovered major welfare concerns over the growing trade in live animal exports from the UK and the EU.
Livestock hauliers were also found to routinely break EU laws for the protection of animals in transit.
It follows monitoring by welfare charities at a checkpoint in Bulgaria - one of the main European borders with Turkey and the Middle East.
Watch the Victoria Derbyshire programme on weekdays between 09:00 and 11:00 on BBC Two and the BBC News channel.