Cows that graze on "ecologically managed" pasture may have more CLA

Raising dairy cows on fresh pasture instead of a standard dairy diet increases the CLA content of their milk five-fold. Now there is some evidence that grazing on organic pasture may boost the CLA even further. In a study conducted in Germany, cows on organic pasture had almost twice as much CLA as those grazing on a nearby, non-organic farm. More research is needed.

(Jahreis, G. et al. (1997). "Conjugated linoleic acid in milk fat: high variation depending on production system." Nutrition Research 17(9): 1479-1484.)