CARSON CITY, Nev. (AP) — Sales of wild horses and burros will be restricted under new rules announced Friday by the U.S. Bureau of Land Management after an investigation into the sale of more than 1,700 horses to a Colorado livestock hauler who supports the horse meat industry.

"It is a response to that inquiry, which is being conducted right now by the Office of the Inspector General of the Interior Department," said Tom Gorey, BLM spokesman for the wild horse program in Washington, D.C.

Wild horse advocates said the rules amount to "window dressing" and won't keep large numbers of mustangs out of the hands of so-called kill buyers.

The inspector general is investigating what became of 1,777 horses sold since 2009 to Tom Davis. Wild horse advocates fear the animals were taken to Mexico for slaughter.

"He's the biggest buyer among all of our buyers over the years," Gorey said of Davis. Since 2005, when the BLM first allowed people to buy horses in bulk as opposed to adopting them, the agency has sold 5,400 animals, Gorey said.

An investigation of Davis' wild horse purchases was published by ProPublica in September.

Gorey said the inspector general is "looking into all aspects of the sales to Davis, including the whereabouts of the horses."

He said it's unknown when the investigation will be finished.

Wild horses are protected under federal law, and selling them for slaughter is illegal.

Davis signed agreements with the BLM promising none of the horses would be sold for slaughter, and he maintains he's done nothing wrong. Local authorities in Colorado also are investigating whether Davis violated brand inspection laws by shipping some horses out of state, according to published reports.

Under the new rules, sales of wild mustangs and burros will be limited to no more than four within a six-month period unless prior approval is obtained from a BLM assistant director. Buyers also must describe where they intend to keep the animals.

Requiring BLM approval for large sales won't protect mustangs, said Suzanne Roy, director of the American Wild Horse Preservation Campaign. Continued...