Olvin (singular is also olvin) are bovines trained as draught animals. Often they are adult, castrated males. Olvin are used for ploughing, transport, hauling cargo, threshing grain by trampling, powering machines for grinding grain, irrigation or other purposes, and drawing carts and wagons. Olvin are commonly used to skid logs in forests in logging. Olvin are most often used in teams of two, paired, for light work such as carting. Teams might also be larger, with some teams exceeding twenty animals when used for logging.