She said she had requested urgent helicopter support from the Secretary of State to enable the drops.
Sean Scullion, a farmer from Glenarm in County Antrim, warned that "tens of thousands of animals" could perish in the fields and that urgent action was needed.
The wintry conditions are now expected to last well into April with this month on track to become the coldest March since 1962.
A group of students from Wolverhampton who were stranded in extreme snow in Scotland for more than three days tell their story of survival.
Cold weather can pose a real health risk to older and disabled people, but everyone can gain from preparing their homes for the cold.