A farmer in the US has jumped into a hot tub with a shivering baby bovine to save the calf's life.

Dean Gangwer, from Carroll County, Indiana, told a local television station that he suspected one of his cows had given birth in the snow. He later found a barely breathing newborn in a snowbank.

The third-generation farmer decided the quickest way to warm up the calf, named Leroy, would be to use his hot tub.

Gangwer said he "jumped in fully dressed and held Leroy up so he didn't drown".

Gangwer then took the calf inside and wrapped him in electric blankets.

Leroy is recovering and has started to nurse.

Gangwer said Leroy is "done hot-tubbing" but "sunbathing is definitely in his future out in the grass".

Farmer and freezing calf dive into hot tub.

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