The Australian Milking Zebu (AMZ) is a composite breed of dairy cattle, developed by the Commonwealth Scientific and Industrial Research Organisation (CSIRO) in Australia  during the mid-1950s. To develop the breed, the CSIRO bred Sahiwal and Red Sindhi cattle  from Pakistan with Jersey cattle. Some Illawarra, Guernsey and Friesian genetics were also included.[1] The development of the breed was governed by strict selection for heat tolerance, milk production and cattle tick  (Boophilus microplus) resistance to result in the modern AMZ breed.