A to Z Challenge: Grass-Fed versus Jersey cows

I've been reading up on grass-fed beef and milk and pasture-raised chickens. They are expensive to raise because they need space. Not quickly fattened up on grains and hormones, they also need time.

But they are healthier for us to eat. The main difference is that they are lower in fat and the fats they have are healthier. There are also additional vitamins.

Since I prefer skim milk, I lose some of the advantages of grass-fed dairy cows. So maybe it's better if I choose milk from Jersey cows--that has more calcium and protein than milk from other dairy cows.

Obviously Jersey cows can be fed grass--the two categories are not mutually exclusive, in theory. In practice, I can choose one or the other.