 With the horse collar, a horse could provide a work effort of 50% more foot-pounds per second than an ox, because it could move at a greater speed, as well as having generally greater endurance and the ability to work more hours in a day.A single horse with a more efficient collar harness could draw a weight of about .A further improvement was managed by altering the arrangement of the teams; by hitching horses one behind the other, rather than side by side, weight could be distributed more evenly, and pulling power increased.