Originally Posted by kevinshorses
None of the mustangs with the exception of the Kiger mustangs in Oregon can be traced back to anything but american stock from the early 1900's.
This is an incorrect statement. DNA studies have been done on several of the herds and there is one herd in particular (Murderer's Creek HMA) that has more
Spanish markers than do the Kigers... which actually indicates that they may have even more in common with the conquistador horses that people are so infatuated with in relation to the Kigers.
The Kiger horses were actually selected from among the horses from the Beaty's Butte HMA in the 60's or so, which means that many of the horses running in that herd can also trace their heritage father back than the 1900's.
Also, the BLM regularly does genetic variability DNA tests to ensure that there is not a dangerous level of inbreeding taking place. The Oregon division of BLM mustang management keeps a close track on the horses and how they are interrelated. They frequently switch the horses up from one HMA to another to improve genetic variability, and I know for a fact that they intentionally leave the most conformationally ideal stock on the range to improve adoptability of the young horses brought in.
All said, the horses aren't really as inbred as you might like to think. At least the ones from Oregon.