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 Subsistence farming is being superseded by intensive animal farming in
Animal genetic resources for food and agriculture animal genetic resources. In 2009, six years after the completion of the human genome project, cattle became one of the first livestock species to have a fully mapped genome. Some general conclusions from recent molecular studies show that individual breeds only differ by typically 40% in total genetic molecular composition; species differ by about 80% of their genetic material. Additionally, breeds with well-defined and appreciated traits tend to be inbred and have low genetic diversity, while non-descript local populations tend to have high molecular genetic diversity. Characterization of animal genetic resources is a prerequisite for its management. Advances in molecular