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 Subsistence farming is being superseded by intensive animal farming in
Vulnerable dog breeds of the United Kingdom Trust. The breeds on the list have been promoted at events such as Discover Dogs and Crufts, and by asking that owners of these breeds mate their dogs rather than having them spayed. The majority of the list come from the Terrier Group, a group mostly derived from breeds with backgrounds in the British Isles. The most marked drop in popularity is that of the Sealyham Terrier, which registered 1,084 breeds in 1938, but by 2004 was registering only sixty dogs a year. In October 2011, British magazine "Country Life" highlighted the breed on its front cover, with the heading