At present, broiler production is located primarily in the central region of Thailand, close
to the hatcheries, feed mills, and processing plants. At the top of the chain map in Figure
4, most chickens originate from parent and grandparent stock imported from the United States of America and the United Kingdom. Most integrators have their own hatchery –
which also supplies day-old-chicks to their contractors and the independent market. Feed
mills have become a part of major integrated poultry companies. Owning a feed mill is an
essential part of the production flow (and cost). Some large companies also have their own
animal pharmaceutical department. Having their own feed mill and pharmaceutical department
can help to enhance the traceability of their inputs