FAO has a unit focused on Animal Genetic Resources, which are defined as "those animal species that are used, or may be used, for the production of food and agriculture, and the populations within each of them. These populations within each species can be classified as wild and feral populations, landraces and primary populations, standardised breeds, selected lines, varieties, strains and any conserved genetic material; all of which are currently categorized as Breeds." FAO assists countries in implementation of the Global Plan of Action for Animal Genetic Resources. FAO supports a variety of "ex situ" and "in situ" conservation strategies including cryoconservation of animal genetic resources.