The distressed animals were secretly filmed at a Norfolk farm signed up to the Freedom Food scheme – backed by the RSPCA – which is meant to guarantee high animal welfare standards.
Footage shot over six weeks reveals pigs mired in a swamp of mud, faeces and urine in a dark barn.
Rats scurry up walls and pick through overflowing bins of rotting carcasses, spilling maggots into pens where healthy and sick pigs are crammed together.
Here we show a selection of the squalid conditions but many of our pictures are too harrowing for a family newspaper.
It’s claimed the pigs spend 24 hours a day in this horrific state until they are sent for slaughter.