 The World Jersey Cattle Bureau has its office in the RJA&HS headquarters building.The Jersey Herd Book is a register in which is recorded information relating to the bovine population, including the owner, a description of the animal, its ancestry, date of birth and many other facts.The Jersey Herd Book was formed on the 4 April 1866 and the ancestry of all pedigree 'Jerseys' in the world can be traced back to the Herd Book maintained on the Island.