American historian, traveller and military man, Col. Theodore Ayrault Dodge wrote many interesting books - the list from modern equivalent of Alexandrine library collection - archive.org; and from his book 'Riders of Many Lands' comes a description of a bronco or horse of the US plains before coming of the Quarter Horse et al.
Well, let us read:
''There is no horse superior to the bronco for endurance; few are his equals. His only competitor in the equine race is his lowly cousin, the ass, of whom I shall say much anon. The bronco came by his toughness and grit natu- rally enough; he got them from the Spanish stock of Moorish descent*, the individuals of which breed, aban- doned in American wilds in the sixteenth century by the early searchers for gold and for the Fountain of Youth, were his immediate ancestors; and his hardy life has, by survival of the fittest, increased this endurance tenfold. He is not handsome.
His middle-piece is distended by grass food; it is so loosely
joined to his quarters that one can scarcely understand where
he gets his weight-carrying capacity, and his hip is very short. He has a hammer-head, partly due to the pronounced ewe-neck which all plains or steppes horses seem to acquire by their nomad life. He has a bit too much daylight under him, which shows his good blood as well as the fact that he has had generations of sharp and prolonged running to do. His legs are naturally perfect, rather light in muscle and slen- der in bone, but the bone is dense, the muscle of strong quality, and the sinews firm. Still, in an Indian's hands his legs finally give way at the knees from sharp stopping with a gag-bit, and curbs will start on his houghs [hocks], for a redskin will turn on a ten-cent piece.
outdoes polo. One form of racing is to place two long
parallel strips of buffalo-hide on the ground at an interval
of but a few feet,and, starting from a distance, to ride up
to these strips, ross the first, turn between the two, and
gallop back to the starting-point. A fraction of a second
lost on a turn loses the race.
Until one thinks of what it means, a twentieth part of a second is no great loss. But take two horses of equal speed in a hurdle race with twenty obstacles. One pauses at each hurdle just one-twentieth of a second; the other flies his hurdles with-out a pause. This lost second means that he will be forty- five feet behind at the winning-post — four good lengths. Another Indian sport is to ride up to a log hung horizon- tally and just high enough to allow the pony but not the rider to get under, touch it, and return. If the pony is stopped too soon, the Indian loses time in touching the log; if too late, he gets scraped off. The sudden jerking of the pony on its haunches is sure eventually both to start curbs or spavin, and to break his
knees. Still the pony retains wonderfully good legs considering.
Colonel Dodge records an instance coming under his
observation where a pony carried the mail three hundred
miles in three consecutive nights, and back over the
same road the next week, and kept this up for six months
without loss of condition. He can carry any weight.
Mr. Parkman speaks of a chief known as Le Cochon,
on account of his three hundred pounds avoir- dupois,
who, nevertheless, rode his ponies as bravely as a man of half the bulk. He as often carries two people as one. There is simply no end to this wonderful product of the prairies. He works many years. So long as he will fat up in the spring, his age is immaterial to the Indian.
It has been claimed by some that the American climate is, par excellence, adapted to the horse. California and Kentucky vie for superiority, and both produce such wonderful results as "Sunol" (famous trotting mare) and "Nancy Hanks.'' Man certainly has done wonders with the horse upon our soil; and alone the horse has done wonders for himself. I have sought for great performances by horses in every land. One hears wonderful traditions of speed and endurance and much unsupported testimony elsewhere ; but for re- corded distance and time, America easily bears off the palm. We shall recur to this point hereafter. Ever since Brown-Sequard
discovered that he could not always kill an Ameri- can rabbit by inserting a probe into its brain, and enunci- ated the doctrine of the superior energy and endurance of the American mammal, facts have been accumulating to prove his position sound.
One peculiarity of the pony is his absence of crest. His ewe-neck suggests the curious query of what has become of the high, well-shaped neck of his ancestor the Barb*. I was on the point of saying arched neck — but this is the one thing which the Arabian or Barb rarely has, being ridden with a bit which keeps his nose in the air. But he has a peculiarly fine neck and wide, deep, open throttle of perfect shape, and with bit and bridoon carries his head just right. There are two ways of accounting for the ewe-neck.
The Indian's gag-bit, invariably applied with a jerk, throws up the pony's head instead of bringing it down, as the slow and light application of the school-curb will do, and this, it is thought by many, tends to develop the ewe-neck. But this is scarcely a theory which can be borne out by the facts, for the Arabian retains his fine crest under the same course of treatment. A more suffi- cient reason may be found in the fact that the starvation which the pony annually undergoes in the winter months tends to deplete him of every superfluous ounce of flesh wherever it may lie. The crest in the horse is mostly meat, and its annual depletion, never quite replaced, has finally brought down the Indian pony's neck nearer to the outline of the skeleton. It was with much ado under his scant diet that the pony held on to life during the winter; he could not scrape together enough food to flesh up a merely ornamental appendage like a crest. Most Moors and Arabs, on the other hand, prize the beauty of the high- built neck, and breed for it ; and their steeds are far better fed. There is rarely snow where they dwell; forage of some kind is to be had in the oases, and the master always stores up some barley and straw for his steed; or in case of need will starve his daughters to feed his mares.
The Indian cares for his pony only for what he can do for him, and once lost, the crest would with difficulty be replaced, for few Indians have any conception of breeding. The bronco's mean crest is distressing, but it is in inverse ratio to his endurance and usefulness. Well fed and cared for, he will regain his crest to a marked extent.''
Juan Carlos Altamirano on Horses of La Conquista
Dr. Phil Sponenberg on Spanish Colonial Horse
Iberian horses genetics
Prints by Frederic Remington and one by Rufus Fairchild Zogbaum