Cows graze on dandelion flowers on the Prooveta pasture on the first day of the season in Gruyeres, western Switzerland, May 8, 2013. During the summer grazing season, starting mid-May to mid-October, the fifth generation Murith family produce a distinctive mountain pasture Gruyere cheese. Each wheel of cheese weighs between 25-40 kilograms, and takes a minimum of six months to mature. Some 200 wheels are produced each year from the unpasteurized milk from his herd of cows and sold locally. Picture taken May 8, 2013. REUTERS/Denis Balibouse (SWITZERLAND - Tags: AGRICULTURE SOCIETY FOOD TPX IMAGES OF THE DAY)