WASHINGTON  The Obama administration announced Monday that it would seek to ban many routine uses of antibiotics in farm animals in hopes of reducing the spread of dangerous bacteria in humans.

In written testimony to the House Rules Committee, Dr. Joshua Sharfstein, principal deputy commissioner of food and drugs, said feeding antibiotics to healthy chickens, pigs and cattle  done to encourage rapid growth  should cease. And Dr. Sharfstein said farmers should no longer be able to use antibiotics in animals without the supervision of a veterinarian.

Both practices lead to the development of bacteria that are immune to many treatments, he said.

The hearing was held to discuss a measure proposed by Representative Louise M. Slaughter, Democrat of New York and chairwoman of the Rules Committee. It would ban seven classes of antibiotics important to human health from being used in animals, and would restrict other antibiotics to therapeutic and some preventive uses.

The legislation is supported by the American Medical Association, among other groups, but opposed by farm organizations like the National Pork Producers Council. The farm lobby’s opposition makes its passage unlikely, but advocates are hoping to include the measure in the legislation to revamp the health care system.