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Utilization and Application of Wet Potato Processing Co-Products for Finishing Cattle

Department of Animal Sciences, Washington State University, Pullman 99164-6351

nelsonm{at}wsu.edu

Abstract

Wet co-products fed to beef cattle include processing co-products of the fruit, vegetable, juice, and brewing industries. Considerations for their utilization in beef cattle diets include quantity available, feeding value, quality of animal products produced, economics (e.g., transportation of water), storage and preservation, consumer perception, nuisance concerns, contaminants, and interactions with other diet ingredients. Potato (Solanum tuberosum) co-products from processing for frozen food products may be quantitatively most important because the 11.3 million t of potatoes (fresh weight) processed in the United States and Canada in 2008 resulted in an estimated 4.3 million t (as is basis) of co-product. Chemical composition and feeding value of potato co-products depends on the co-product type. The names of co-products vary among potato processors and some processors combine the different co-products into one product commonly called slurry. The four main potato co-products are: 1) potato peels; 2) screen solids (small potatoes and pieces); 3) fried product (fries, hash browns, batter, crumbles); and 4) material from the water recovery systems (oxidation ditch, belt solids, filter cake). The co-products, except the fried products, ensile rapidly, reaching pH 5 in 7 d or less. Dry matter content varies from 10 to 30% and varies, on a DM basis, in CP (5 to 27%), starch (3 to 56%), NDF (4 to 41%), and ether extract (3 to 37%) content among potato co-products. Type of co-product and frying greatly affect the energy value (0.6 to 1.6 Mcal NEg/kg DM). Composition, quality, and shelf life of beef was not affected by potato co-product feeding in contrast to perceptions of some purveyors and chefs. Potato co-products are quantitatively important energy sources in beef cattle diets, which, in turn, solve a potentially massive disposal problem for the food processing industry.

Key Words: beef cattle • potato co-products