Livestock production in the U.S. is dominated by beef, dairy, swine, and poultry production, but other livestock are produced as well. Sheep (produced for both wool and meat) represent the largest category. Goats are the source of angora and mohair, and are also produced for meat and milk. A substantial number of horses and ponies are maintained in the U.S. Most other livestock are produced in small quantities.The amount and characteristics of wastes produced per animal depends on a number of factors including species, size, type of feed, and function. Feeds that are less digestible increase the total solid content of the waste, relative to more digestible feeds.
Information regarding the collection and management of manure for these livestock species is lacking. It seems likely that a substantial number of the animals spend a significant portion of their time on pasture, rather than pens or barns, and thus much of the waste may not be collected. For horses, large amounts of bedding are typically used in stables, so the qualities and quantities of wastes are generally dominated by the kind and volume of bedding used.