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The Bureau of Land Management spends about $50 million a year to house and feed more than 46,000 wild horses and burros in corrals. Another 73,000 of the animals roam freely across the western states, producing foals and grazing on public lands that conservation groups say are quickly deteriorating.

It's an escalating equine-population problem, and the fiscal 2018 budget President Donald Trump proposed this week suggests a solution: using "humane euthanasia and unrestricted sale of certain excess animals."

The change could lead to sales of wild horses to slaughterhouses in Mexico or Canada, as well as to the culling of herds, to address what the bureau calls an "unsustainable" situation. But it has been condemned by horse and other animal advocacy groups, some of which have consistently resisted efforts to impose limits on an icon of the American West that has been federally protected since 1971.

"President Trump promised to return government to the people, and we trust that he meant it," said Suzanne Roy, executive director of the American Wild Horse Campaign. "America can't be great if these national symbols of freedom are destroyed."

The Trump proposal notes that the BLM's wild horse and burro budget has quadrupled since 2000, from $20.4 million then to $80.4 million in 2017, and that most of the money goes to care for animals that reside in taxpayer-funded corrals. The proposed budget anticipates saving $10 million annually by selling some of those animals and by reducing roundups and horse and burro birth-control programs.

The use of euthanasia and sales to manage the population is not a new idea: The 1971 Wild Free-Roaming Horse and Burro Act permits the interior secretary to remove older and unadoptable animals by those methods. But for much of the past three decades, Congress has used annual appropriations bill riders to prohibit the killing of healthy animals or "sale that results in their destruction for processing into commercial products." While it is unclear whether lawmakers would now be willing to lift the prohibition, an aide on the House Appropriations Committee said the request would be considered.

Although the last U.S. horse slaughterhouse closed in 2007, meat processing plants in Mexico and Canada slaughter tens of thousands of domestic American horses each year for export to Europe and Asia. And despite the congressional ban, some wild horses sold to private buyers have been slaughtered anyway. In November 2015, federal investigators found that a Colorado rancher to whom the government had sold 1,794 mustangs turned around and sold them to slaughterhouses in Mexico.

As the wild horses and burros, which have no natural predators, have increased in numbers, officials and conservation groups say they have depleted the amount of forage food and water available to native species in the West. That, in turn, has increased the risk of widespread starvation and thirst among these herds and wild animals on public lands.

Wild horse advocates counter that the bureau is pandering to ranchers who view the horses as competition on public range land also used for cattle grazing.

Meanwhile, adoptions by the public — the bureau's primary program for reducing the population in government corrals — have not increased with the population. Last year, 2,912 wild horses and burros were adopted, up from 2,583 in 2012, according to agency figures.

The budget proposal comes eight months after the bureau's wild horse and burro advisory board, a volunteer body that makes no binding decisions, sparked an uproar among wild horse advocates by recommending euthanasia or sales for the animals. Subsequent false reports about a looming government plan to kill 45,000 wild horses prompted the BLM, then under the Obama administration, to say it "does not and will not euthanize healthy animals."

Some board members said their recommendation was made, in part, to shock Congress into doing something about a problem they believe is spiraling out of control.

"All these horses in long-term holding are eating up 60 percent of the wild horse and burro budget. Other things can't be done well or thoroughly because we're feeding a lot of stockpiled horses that no one wants," Julie Weikel, a large-animal veterinarian on the advisory committee, said in an interview this week. "I fully expect a full-court press from the advocates to put the rider back on. But I assure you that will not solve the problem."

The question of how to address the problem appeared on Interior Secretary Ryan Zinke's radar not long after he was confirmed. According to his personal schedule, he held a video call on the topic on March 24 with the BLM's acting director, Michael Nedd, and several other senior officials.

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For more than 40 years, past administrations have tried but failed to control the animals' numbers. In 2009, then-Interior Secretary Ken Salazar proposed that the U.S. government spend roughly $96 million to buy land in the Midwest and East to create two preserves that could each support 3,600 horses. He also suggested that federal officials partner with nonprofit organizations and other private groups to create five additional preserves, so that 25,000 animals would be living on preserves within five years. The government also would aggressively sterilize the horses and burros to keep them from reproducing.

At the time of Salazar's proposal, about 37,000 horses and burros were roaming and another 32,000 were in holding pens. But the money did not materialize, and the number of animals on public range lands increased sharply. It now is about three times more than officials say is sustainable.

Some animal advocacy groups say the BLM has not proactively pursued horse and burro birth control, though other activist groups have sued the agency over the use of injectable contraception and the spaying of mares. In a statement this week, Matt Bershadker, president and chief executive of the American Society for the Prevention of Cruelty to Animals, said the animals could be "humanely" managed with fertility control, but the BLM "would rather make these innocent animals pay for draconian budget cuts with their very lives."

Weikel said she hopes Trump's budget proposal prompts Congress to consider lifting its usual rider. Considering the proposal, along with the advisory board's recommendation, "maybe thoughtful people . . . would realize we have a true problem out there. And we are not using all the tools." In addition to euthanasia and sales, she said, permanent sterilization should be utilized more.

In a statement, the BLM said its goal "is always to find good homes for the thousands of wild horses and burros gathered from overpopulated herds on our country's public lands." It continued, "With an expanded suite of management tools, the BLM can strengthen its efforts to reverse the declining health of our nation's wild horse and burro herds and manage the public lands on which they and so many other species depend."