The Chinook made deliveries to the Glens of Antrim on Tuesday, and is now understood to be heading to the Dromara area of South Down.
Agriculture Minister Michelle O'Neill said that the Irish Air Corps was also providing air support to help find and rescue stranded livestock.
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.