"Cows on a conventional diet will be supplemented with up to 50% of their diet as grains. It is the starch in these grains, when converted to milk fat, that will lead to the butter having a pale off-white color. With pasture-fed cows, there is very little, if any, starch in the diet. All protein and energy comes directly from the grasses and herbs in the pasture."
"The deep yellow color is due to the pigments that are present in the grass that the cows are feeding on daily. Both chlorophyll and carotene are pigments found in the chloroplasts of plants, and are involved in photosynthesis, which ultimately leads to the nutritional content of the butter."
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