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This shocking footage reveals the mutant 'double-muscled' pigs being bread by a farmer in Cambodia.

The terrifying creatures are thought to be the result of genetic breeding.

Some of the super-sized animals have enormous testicles while others are barely able to walk because of their muscles.

Videos and images of the freakish pigs have gone viral after being posted on Facebook.

The page is called Duroc Cambodia, referring to a common breed of domestic pig which originated in the US.

But the farmer, thought to be based in Banteay Meanchey province, appears proud of his stock.

(Image: Facebook) (Image: Facebook)

He has been sharing regular updates on the pigs' progress since last December.

The page offers two lots of pig semen and two artificial penises for for just £5.

The desire for increased muscle is thought to be driven by increased prices for pork by weight.

Demand has soared in recent years, especially in China which is the world's biggest pork market.

Many have been left outraged and have accused the farmer of using steroids and growth hormones to get the astonishing results.

(Image: Facebook)

(Image: Facebook) (Image: Facebook)

Janice Short wrote on the page: "This is grotesque! Obviously bred like this. Are there no laws to stop this sort of thing. Ugh!"

Ric Tucker added: "what are you trying to show here? How much meat you can produce, or how badly these animals are treated? Whoever is looking after these should be locked up for EVER!"

Animal right group PETA have condemned the footage.

"Hulk-like pigs are the stuff of nightmares, not meals, and those who are genetically engineered are also likely to be born with painful health issues," the group said in a blog post.

Reports first surfaced in 2015 of 'double-muscled' pigs in South Korea and China that were the result of a single gene alteration.

The aim was to produce leaner meat at higher yield.

But of 32 pigs bred, only 13 survived to eight months old and only one was considered healthy.