Each year, federal inspectors find illegal levels of antibiotics in hundreds of older dairy cows bound for the slaughterhouse. Concerned that those antibiotics might also be contaminating the milk Americans drink, the Food and Drug Administration intended to begin tests this month on the milk from farms that had repeatedly sold cows tainted by drug residue.

But the testing plan met with fierce protest from the dairy industry, which said that it could force farmers to needlessly dump millions of gallons of milk while they waited for test results. Industry officials and state regulators said the testing program was poorly conceived and could lead to costly recalls that could be avoided with a better plan for testing.

In response, the F.D.A. postponed the testing, and now the two sides are sparring over how much danger the antibiotics pose and the best way to ensure that the drugs do not end up in the milk supply.

“What has been served up, up to this point, by Food and Drug has been potentially very damaging to innocent dairy farmers,” said John J. Wilson, a senior vice president for Dairy Farmers of America, the nation’s largest dairy cooperative. He said that that the nation’s milk was safe and that there was little reason to think that the slaughterhouse findings would be replicated in tests of the milk supply.

But food safety advocates said that the F.D.A.’s preliminary findings raised issues about the possible overuse of antibiotics in livestock, which many fear could undermine the effectiveness of drugs to combat human illnesses.

“Consumers certainly don’t want to be taking small amounts of drugs every time they drink milk,” said Caroline Smith DeWaal, food safety director of the Center for Science in the Public Interest, an advocacy group. “They want products that are appropriately managed to ensure those drug residues aren’t there, and the dairy farmer is the one who can control that.”

RTFA for the details. Poisonally, I trust the Dairy Farmers association as far as I can throw them uphill into a heavy wind. Maybe because everyone I hang out with in the cattle business are beef growers not milk growers. But, the evidence has been pretty clear that virtually all the instances of BSE getting into the mainstream originated with dairy farms.

And – the FDA is just beginning to get up on their hind legs and starting to fight for consumers. In past administrations, Democrat and Republican, the profit-takers have been the regulators as far as best practices were concerned. Things have only begun to change in the past two years. Yes – there’s that word the KoolAid Party hates, again.