When the fullblooded/thoroughbred horse is crossbred with other warmblooded breeds, the progeny is called halfbloods (halfblooded breeds). With a certain adaptation of living conditions, a pragmatic selectivity and inbreeding there was achieved stability of certain types of crossbreeds that is marked as an individual race/breed. There, where the progeny has abundantly admixed full blood, and where the exterior is resembling the fullblooded horse, we are talking about a light or refined halfblood or about a horse that is “high in blood” of the English thoroughbred or the Arabian thoroughbred/purebred. Such individual is mostly used as a light riding or carriage horse. By the heavier warmblooded breeds, to which the full blood was admixed for the correction of various shapes, forms or temperament, we are talking about heavier or heavy halfbloods, which are mostly used as heavy riding horses or as heavier country/agricultural horses.
For the halfblooded breeding, namely for the heavier caliber, there are used strong fullblooded stallions that by certain weight have sufficiently strong skeleton, mainly the legs, they are adequately deep and wide, have high withers, long and slant shoulder blade, short and strong back but long pelvis/hindquarters, roomy and faultless gaits, and can prove certain endurance on the racetrack. Such stallions are paired with appropriately selected, relatively heavier warmblooded mares. Too light fullbloods/thoroughbreds, even though they may have won many times on the track, produce mostly too light offspring, which is then suitable for riding horses only and that by training can also be used for racing, hence they have only sporting purpose. This rule has plenty of exceptions, because the value of the stallion is set by his offspring and not only in racing but in the halfblood breeding as well; there were many cases where the light thoroughbreds, paired with heavier warmblooded mares produced remarkably strong offspring.
The more refined are the halfblooded breeds in forms and certain outputs/performances, the longer they can do without the refreshment of the English fullblood/thoroughbred, but permanently without the refreshment of the full blood no halfblooded stud farm can do (that is without improvement in “constitution” and performance”). The thoroughbred can hardly be used in the agriculture, because he would produce too light and too temperamental horses, hence more difficult to handle offspring, and even there where there is a need for a lighter agricultural/homestead horses. Therefore the thoroughbred is/was taking part in the country/agricultural uses through his halfblooded progeny.