Scientists from the University and Tesco have developed a special piece of equipment to measure how much methane cows produce when they burp.
The laser device is held 3m from the cow’s mouth for five minutes and records the potency of burps from cows.
Climate experts believe methane is around 20 times more powerful than carbon dioxide and accelerates global warming.
Dr Rob Smith, Veterinary Clinical Sciences, said: “The readings will further understanding on what goes on in a cow’s stomach and how best to change farming styles to reduce the amount of methane and the carbon footprint on your milk bottle.”