ST. HELENS, Ore. -- The Oregon Senate has given final approval to a bill to crack down on "puppy mills" by setting a limit of 50 breeding dogs at production facilities.

The measure, which now goes to the governor, is aimed at putting out of business large-scale operations where breeding dogs at times have been subjected to cramped, filthy conditions.

The law also aims to increase buyer protections by adding disclosure requirements for private breeders and retail pet stores.

Backers say six such operations have been busted by law enforcement authorities in Oregon over the past two years and that the bill is aimed at shutting down other "puppy mills."

"The Oregon Senate leveled a blow today against those who abuse dogs and deceive pet buyers," bill co-sponsor Rep. Paul Holvey said.

The bill, which also sets standards for care of the dogs, is part of a push to crack down on inhumane breeding operations around the country.