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Livestock is grown both on the range and on the farms, but the number could be increased considerably and the quality could be greatly improved by providing better pastures and forage and by scientific breeding. The commonest domestic animals are sheep and goats, but they are raised more on the desert range than on the farms. Close grazing by these animals over many countries has destroyed most of the vegetation over large areas. They are efficient meat-producers and also yield valuable wool, mohair, skin and milk. On account of their destructive nature, however, they should be well herded and kept away from valuable crops and trees. Cattle, although abundant on some farms, are less common than sheep. They are used as work animals and milk producers, and also produce meat and hides. Beef is not widely used here, and is lean, tough and of low quality. The cows are also poor milk producers. The inferior quality of the cattle is due partly to poor breeding and partly to lack of nourishing feed, as they are seldom fed grain or hay, and must get most of their sub- sistence from poor pastures or stubble fields.