Animal husbandry in the British Agricultural Revolution of the 18th century, when livestock breeds like the Dishley Longhorn cattle and Lincoln Longwool sheep were rapidly improved by agriculturalists such as Robert Bakewell to yield more meat, milk, and wool. A wide range of other species such as horse, water buffalo, llama, rabbit and guinea pig are used as livestock in some parts of the world. Insect farming, as well as aquaculture of fish, molluscs, and crustaceans, is widespread. Modern animal husbandry relies on production systems adapted to the type of land available. Subsistence farming is being superseded by intensive animal farming in
Shetland animal breeds dairy and beef. Modern Shetland cattle are usually pied black and white, although other colours were common in the past and sometimes still occur. These cattle are similar in type to other European traditional cattle breeds, and are sometimes used for conservation grazing (the management of natural habitats using grazing animals). Sheep have been kept on the Shetland Isles for at least a thousand years. They are one of the Northern European short-tailed sheep group of breeds, and were regarded as a local type of the extinct Scottish Dunface, which was found throughout the Highlands and Islands of Scotland (and