Quantitative analyses of selected plant by-product feedstuffs, a global perspective

Abstract

The dry matter tons, metabolizable energy, and crude protein tons were determined for over 20 selected by-product feedstuffs in 1993 from Argentina, Egypt, Kenya, Mexico, Korea Republic, China, USA, and the World. The by-product feedstuffs were grouped into three categories: Miscellaneous which included almond hulls, bagasse, beet pulp, brans, brewers grains, citrus pulp, cottonseed, and molasses; Cakes which included the major oil cakes and meals; and Crop Residues which included the crop residues from the non-feed production of wheat, rice, barley, and maize. The total World dry matter tonnage for all groupings of by-product feedstuffs is almost 1 billion metric tons of which about 65% are from Crop Residues. Most countries had a tremendous amount of energy in the Crop Residues category with over 375 Mcal per capita for the USA, 305 for Argentina, 208 for China and 181 Mcal per capita for the World. Even more Mcal per capita was in the other grouping of by-product feedstuffs for Egypt, Kenya, Mexico, Korea Republic, and the USA. The total Mcal from these selected by-product feedstuffs for the World was almost 2 trillion Mcal. The protein tonnage was highest in the Cakes grouping for Mexico, Korea Republic, USA, and the World. A by-product feedstuff equivalent was defined as the percentage of an unprocessed commodity that becomes a by-product feedstuff on a dry matter basis. Not including Crop Residues, molasses, or soap stock oils, the overall by-product feedstuff equivalents ranged from 22% for Egypt to 40% for the USA. These equivalents demonstrate the large amounts of by-product feedstuffs generated when commodities are processed for food or fiber and the importance of animals as consumers of these by-product feedstuffs. Future projections suggest that the amount per capita of by-product feedstuffs will increase in developed countries and remain the same or increase slightly in developing countries.