An animal science researcher found the same reference. In 2000, Cornell equine nutritionist Harold Hintz mentioned the lameness problems of Custer's late-arriving pack train horses; Professor Hintz brought equine selenium toxicity back into the Custer conversation.
Sitting Bull took care not to winter his horses in those types of fields.
But it wasn't until the 1930s--more than 50 years after the massacre--that it was scientifically proven that selenium is toxic to horses in large doses, and that it causes a form of laminitis-like changes of such severity that horses' feet will actually start to slough. In Custer's day, it was known as "alkali disease", and the US Army had kept records of horses sloughing their hooves when grazing in the upper plains states as far back as 1860. (USDA, 1991 report on selenium toxicity)
(To learn more about selenium toxicity, scroll down and read our post from June 11, 2007; horses are still suffering from selenium-based laminitis today, as the University of Missouri vet school shares.)
By the way, the Native American name for the Little Bighorn is "The Greasy Grass" River.
Comanche was a wild horse from Texas who was rounded up and sold to the US Government. He was ridden by a horse-loving Irish immigrant, Captain Myles Keogh. Writer Deanne Stillman worked on the definitive biography of Comanche as the icon of the American wild horse. Her new booHorse Latitudes: Last Stand for the Wild Horse in the American West, published by Houghton Mifflin in 2008.
Another interesting book is Custer's Horses by Gary Paul Johnston.
And what became of Gustave Korn, the German farrier who was Comanche's personal groom? Korn cared for Comanche at Fort Riley in Kansas, among other locations. The horse was revered by the entire US Army.
However, in 1890, Korn was assigned to field duty and was sadly killed at Wounded Knee. According to records, Comanche became depressed without Korn at his side, although another farrier, Samuel Winchester, was assigned to be his personal servant.
On November 7, 1891, Comanche died of colic in Winchester's arms. The horse was 29 years old.
As an interesting aside: Comanche's hide was stuffed and he has been living at the University of Kansas at Lawrence for over 100 years, unless he has been moved recently. It's interesting to read that his hide was excessively long-haired.
Comanche was never ridden after Little Big Horn, and spent his days roaming freely about the fort, where he bullied people for food and ate out of the trash. He also developed a liking for beer and was known to be intoxicated more than once.
To learn more:
Colorado State University hoof tissue test for selenium toxicity
Hintz, H.F. and Thompson, L.J., 2000. Custer, selenium and swainsonine. Veterinary and Human Toxicology, 42(4), pp.242-243. Link to abstract only.