There are more than 150 different breeds and types of horses in the world. The development of each of them has been influenced by man. Domestication resulted in selective breeding and, in many instances, more nutritious feeding, both of which led to an increase in the size or the quality (or both) of the horse. However, the biggest influencing factor was the work which humans required their particular horses to perform. Those who needed to move heavy loads bred for strength, while others in need of fast transportation bred for speed. The terms coldblood and warmblood (which have nothing to do with temperature) are used to describe horses. Coldblood refers to the heavy draught breeds which are believed to be descended from the prehistoric horse of northern Europe. Warmblood refers to the lighter, riding type of horse. Nowadays the term "warmblood" is used in connection with the horses being bred for competition riding.