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Scottish farmers fear that up to a million sheep face being starved or frozen to death after being caught out on exposed hillsides.
The National Farmers' Union in Scotland said about a third of the country's sheep were on hills and warned that many flocks were "on a real knife edge". After weeks of snow and sub-zero temperatures, conditions are expected to worsen this weekend, with the cold lasting for at least another week.
The warning came as some dairy farmers had to dump milk and add it to their slurry after milk tankers were unable to reach them because local roads had become impassable.