Which cows’ milk – grazing or indoors – will be richer in vitamin D?

1) The production of vitamin D is carried out in the skin under the influence of ultraviolet radiation
2) Cows grazing in pasture will receive more UV dose than cows in an enclosed area, which means that more vitamin D will be synthesized in their body.
3) Vitamin D formed in the body of the cow will enter the milk, so there will be more vitamin D in the milk of free-grazing cows