The American Feed Industry Association (AFIA), which represents
the USA animal feed industry, is a trade association which
estimates that approximately 3,000 feed mills exist in the USA and
these mills produced between 107, 000 to 112,000 million kg of
animal feed over the last ten years (Batal et al., 2008). The feed mill
sector is a very important part of the agricultural industry for the
USA from an economic perspective because the sector directly
employs about 110,000 individuals and contributes approximately
$35 billion from feed sales toward the USA economy annually
(International Feed Industry Federation, 2009).