MINNEAPOLIS — A long struggle over what kind of milk counts as organic is coming to a head.

The Department of Agriculture has issued draft rules for organic milk that would require that the cows be on pasture at least half the year and get plenty of fresh grass. The proposals are meant to close a loophole that has allowed some huge feedlots to sell their milk as organic, even though their cows rarely grazed on fresh grass.

Advocates for family dairy farms and organic consumers say that's not what shoppers think they are buying when they pay a premium for organic milk.

"Pretty much the entire organic community welcomes the long-overdue closing of loopholes for pasture and feed in the organic dairy regulations," said Ronnie Cummins, national director of the Organic Consumers Association.

The public comment period on the draft rules runs through Dec. 23. In the notice published in the Federal Register late last month, the Agriculture Department said consumers and others had made clear their feelings that organic cows should get their nutrition from grazing.