It is an ancient ritual that helps the animal balance itself when standing on two legs or hooves.
But some experts have questioned whether the ritual is really necessary.
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Professor John O’Connor, of the College of Veterinary Surgeons at the University of Exeter, said extra weight “is more likely to cause problems for horses and may contribute to injuries and possibly fatalities”.
He told BBC News: “In general horses are very sensitive to weight.
“If they are able to keep their balance on their hooves they should be fine.”
The BBC’s Mark Porter said the technique also works in humans.
But it might not be the best way to help the horses.
A spokesman for Royal Farmhouse Hospital in Oxford, in Wiltshire, said, according to a Daily Mail story: “The weight of horses is very high. If you look at the pictures – and I have taken them – it is quite obviously an extra weight in their legs and chest.”
In 2011, an animal charity called Help the Animals issued a statement saying: “Injuries or even death can occur if a horse is left with extra weight.
“The hooves make for an unstable weight, especially at high speed, which can lead to the horses being thrown or tripped. Any horse left at that speed is prone to a fall.”
The U.S. Senate has voted to reject a motion that would have prevented President Trump from rolling back Obama-era regulations.
The Senate rejected Friday an Obama-era regulation to ban hydraulic fracturing of oil and gas wells. The amendment by Senators Pat Toomey (R-PA) and Lisa Murkowski (R-AK) will go to the House to get on the president’s desk.
Toomey, one of Trump’s strongest Republicans in the Senate, has a reputation as a climate hawk.
Murkowski was one of a handful of senators who spoke up against the Obama-era rule.
“It’s an abuse of power by the Trump Administration to target states’ rights and the rights of families in communities they are elected to represent,” Murkowski said.
“We cannot let an out-of-control regulatory monster take over the entire country without consequence,” she said.
In his speech to Congress on Wednesday, Trump laid out his “America First” goals. He called the regulation “one of many examples of Washington overreaching
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