Dairylea is offering a free musical plastic cow in a new instant-win promotion on special packs.

The cow is designed to sit in the fridge and plays a song when the fridge door is opened.

Up to 100 shoppers can win each day during the 12-week promotional period, which will run across Dairylea spreadable tubs and Dairylea Dunkers single and multipacks.

Special packs will roll into retailers at the end of this month.