Prominent equestrian author, R.T. Fitch, has exposed information reported in a news story from July 18 as incorrect.
The report said the Confederated Tribes of Warm Springs, Oregon, would attempt to reintroduce horse slaughter into the United States.
"Native Americans and others are pushing for the renewed slaughter of horses in the US ... and processing them into meat," the original report said.
It said the plant was being considered for a reservation north of Madras, as recommended last spring by a coalition of Northwest tribes.
"No, we are not making any plans to build a horse slaughter plant on any reservation," said Tim Outman, field representative for the Warm Springs Tribe's Department of Natural Resources.
Putting all cultural and moral conflicts aside, Outman said, "Who would invest $US8-10 million into building a facility where there is absolutely no market?
"Shipping horse meat is against federal law. We have no idea what, where or who, is perpetuating this misinformation.
"This sort of journalism does nothing to further the cause and public relations of the Confederated Tribes of Warm Springs," said Outman.
Animal Welfare Institute head Chris Heyde has also voiced his anger at the report, telling an Oregon news organisation that he spent a great deal of time on the phone with the reporter providing the facts and evidence "dismissing the misleading claims put forward by individuals more interested in abusing horses than advancing the truth".
"However, what does he do? Prints rhetoric," Hyde continued.