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Summary

Feeding distillers grains (DGS) to cattle can increase PUFA concentration, increase lipid oxidation, and decrease color stability of beef. The objective of this study was to evaluate the effects of feeding DGS and the postmortem addition of antioxidants on the shelf life of ground beef products. Crossbred heifers (n = 64; initial BW = 225 kg) were supplemented with different amounts of modified DGS (MDGS; 0.91 or 2.27 kg daily, DM basis) during backgrounding and finished on diets containing corn gluten feed or MDGS. Four beef shoulder clods from each dietary group were ground independently. Fatty acid composition was analyzed in lean tissue, s.c. fat, and composite samples. Raw patties in retail display were analyzed for lipid oxidation, percent discoloration, and objective color. Cooked beef links were manufactured with salt, phosphate, and varying quantities of an antioxidant (rosemary and green tea extract), and lipid oxidation was measured throughout storage. Finishing cattle fed MDGS had greater C18:2 and PUFA (P ≤ 0.028) content in all locations, whereas cattle supplemented with greater amounts of MDGS during backgrounding had more C18:0 (P = 0.005) and less C16:1 (P = 0.020) in s.c. fat. Raw ground beef from heifers finished with MDGS discolored at a greater rate (P < 0.001), but lipid oxidation was not different (P = 0.47). Greater lipid oxidation in cooked beef links occurred when cattle were fed greater amounts of MDGS during backgrounding or MDGS during finishing, but adding the rosemary and green tea extract decreased lipid oxidation regardless of dietary treatment.

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