http://www.thekitchn.com/all-the-co...eese-colors-explained-the-cheesemonger-166329
Yellow cheeses with a buttery hue (not the brightly-colored yellow cheeses, described above) are largely cow milk cheeses. Even more specifically, they're probably
grass-fed cow milk cheeses, and probably from the milk of a breed of cow (like the Jersey breed) with super-high fat content. Butterfat in milk, in conjunction with the beta-carotene in an animal's diet, makes a cheese deeply yellow. Beta-carotene (think carrots) translates directly from the milk to the vat to that final wedge of cheese. A cow that munches on grass intakes significantly more beta carotene than one that's eating hay or grain. A few American greats come to mind that typify this phenomenon: Meadowcreek Dairy's Grayson, Upland Cheese Company's Pleasant Ridge Reserve, and Cato Corner's Hooligan. Furthermore, a cheese that's left to age will deepen in color, so a cheese that's ripened for 9 months will be significantly more intense color-wise than a fresh cheese.