" The data on livestock numbers are intended to cover all domestic animals irrespective of their age and the place or purpose of their breeding. Estimates have been made for non-reporting countries as well as for countries reporting incomplete data. However, in certain countries, data for chickens, ducks and turkeys do not yet seem to represent the total number of these birds. Certain other countries give a single figure for all poultry; data for these countries are shown
under “Chickens”.
Meat: Data relate to animals slaughtered within national boundaries, irrespective of their origin. "

For more information: http://fenixservices.fao.org/faostat/static/documents/QL/QL_methodology_e.pdf