A perfect farm animal, according to the 18th-century agronomist Robert Bakewell, would be shaped like a hogshead cask, ‘truly circular, with as small and as short legs as possible’. Bakewell’s ideal was founded ‘upon the plain principle that the value lies in the barrel’. There was no need for long limbs or lean necks: ‘all is useless that is not beef.’ This applied not only to cattle, but to pigs and sheep too, which after 1750 came to be reared as ‘production line animals’.