Tuesday, March 26th 2013, 5:09 PM EDT
Farmers fear that thousands of sheep and cattle have died in the snow that has hit in recent days.
Northern Ireland farmer Catherine Crawford said: "There are hundreds of farmers who have sheep buried."
"We are very, very, anxious," said Carolyn Lamb from NFU Scotland, who added that the full toll would not be known until the snow melted.
The NFU said hundreds of animals were lost in England and Wales, with Cumbria and Shropshire worst hit.
"There are animals going to die here and are dying; we need help out in the rural areas," said Ms Crawford.
The late snow has hit during lambing season, "a key time for farmers", making the situation worse, the NFU said.
Campbell Tweed, a farmer from Cairncastle near Larne in County Antrim, said some of his sheep were getting their first feed in four days.
"Road conditions are just incredibly bad. There's places where the snow at the side of the road is higher than the vehicles. It's coming late in a very, very tough winter - it's just putting the tin hat on it for many of us."
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