 Horse teams usually were four horses, or perhaps six, as compared to eight oxen, and the lesser numbers compensated for the fact that the horses needed to be fed grain on top of pasture, unlike oxen.The increased speed of horses also allowed more land to be ploughed in a day, with an eight ox plough team averaging half of an acre per day, but a horse team averaged a full acre per day.For farm work, such as ploughing and harrowing, the draught horses utilized for these purposes were, in England, called 'affers' and 'stotts' ("affrus" and "stottus" in medieval Latin).