Letter: It's grass that turns milk healthier

From Sam Edge

You briefly report levels of heart-protecting omega-3 fatty acids in organic milk (20 February, p 7). An author of this study, interviewed on BBC radio, made clear that the cause, most likely, is that organic dairy cattle are fed more grass and less cattle feed than non-organic cattle, on average. I recall him saying that non-organic cows thus fed would show the same effect.

Ringwood, Hampshire, UK