This is a really interesting resource I’ve found that discusses the various histories and management philosphies of different HMAs. Here’s the link for what they have to say about those in Oregon:
Ah, yep, here’s what they have to say about Kigers:
"Kiger Mustangs are known for their strong dun factors, for which they are selectively managed. Other Kiger-Riddle colors include bay, buckskin, and gray - even an occasional palomino. (Read the DUN color page to learn how that works)
Kiger horses are typically 13 to 15 hands and weigh 750 to 1000 pounds. They have light to medium bone and small feet. Ear tips are often hooked and females have very fine muzzles.
Historically, these two herds were created by BLM, led by Ron Harding, to develop a wild breed of Old Iberian type. The area was chosen due to its isolation, being rimmed by high mountains, which made it nearly impossible for neighboring horses to intermingle. Existing horses were captured and moved from the Kiger Valley to Palomino Buttes. A group of very Iberian-looking, spectacularly marked duns from Beaty’s Butte were moved to the Kiger Valley to form the foundation for the herd. Two separate home ranges - Kiger and Riddle - were established in order to maintain genetic health.
Dr. Gus Cothran performed genetic analysis of these two closely related herds in 2000 - 2001, checking on genetic health as well as possible ancestry. He found that these two herds have one Spanish marker, and a high degree of genetic variability, indicating health, and “likely, although not necessarily” mixed origin and recent introductions of unrelated animals. He states that it is not possible at this stage of our understanding of horse genetics to say with certainty which breeds were specifically involved in the ancestry of the Kiger. The breeds most closely resembling the Kiger are various breeds of known Spanish origin as well as the Appaloosa.
The Kiger herd tested to be quite similar genetically to other nearby Oregon herds, as well as Northwestern California herds. They fit within the light racing and saddle breeds cluster of breeds.
There are four genetic markers that occur only in horses of Spanish ancestry, and the Kiger herd has one, called “D-dek.” The Kiger has a strongly Spanish “phenotype” (physical appearance) which is quite attractive, and many are gaited. "