A technology company are revolutionising the dairy industry with a range of robotic 'maids' that milk cattle - whenever the cows feel like it.

The automatic cow milker allows the heifers to walk in whenever their udders are feeling uncomfortable - and automatically gives them a good milking.

Agri-tech giant Lely’s newest automatic machine lets cows choose for themselves when they want to be milked and is set to change modern farming.