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Families had their Christmas Day ruined after carving open their turkeys and discovering the birds were ‘glowing’ green.

Furious Tesco customers went to the firm’s Facebook page to complain about their unsightly festive meals.

Shoppers complained that after forking out up to £30 for the frozen birds they were horrified to find what was inside.

They posted photos of crowns of turkey meat cut in half to reveal unsightly fluorescent green flesh.

The off-colour meat, which is not thought to be harmful, is thought to be caused by a degenerative condition Green Muscle Disease.

It occurs when the inner breast muscle prevents blood supply from circulating - resulting in the green discolouration.

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(Image: SWNS.com)

(Image: SWNS.com) (Image: SWNS.com)

(Image: SWNS.com)

Mum-of-four Rachael James, 33, from Whitchurch, Shrops, found green flesh when carving her turkey.

She said: “It was our Christmas lunch with our four young children and grandparents watching me carve.

“It put everyone off their meal. None of us felt like we could eat any of the turkey.

“I investigated the green mass and discovered that it went from one side of the breast meat to the other. It was disgusting.”

(Image: SWNS.com)

Steve Parsons, 26, from Lyme Regis, Dorset, also complained to Tesco about his green turkey.

He said: “My mother-in-law was basting the turkey all night. It put a downer on the whole day.”

Tesco said it has offered refunds to affected customers and is informing its supplier about the issues.

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