The repercussions of this week's revelations that meat bred from cloned cows has entered the food chain just keep on coming. Farmers supplying milk to Dairy Crest have been ordered to sign an official declaration to confirm they are not supplying milk from cloned cows or their offspring. And now there are calls for some major work to clarify the regulation of produce derived from animals linked to cloning. The two bulls bred from cloned cows came from a farm near Nairn in Scotland. Beef production north of the Border was worth nearly £600 million pounds last year and farmers and processors are keen to make sure trade isn't detrimentally affected by the current confusion over cloning. Donald Bigger is a beef farmer in Dumfries and Galloway and he's also the Chairman of Quality Meats Scotland. He says there's a strict and comprehensive assurance scheme to ensure the meat that appears on supermarket and butchers' shelves is what it says it is on the label. Presented by Caz Graham and produced by Anna Varle.