A Comparison of Wheat and Corn-Based Distillers Grains Plus Solubles and their Combination on the Quality of Raw and Pre-Cooked Semimembranosus Roasts

摘要

The objective of this study was to compare meat quality traits of raw and pre-cooked beef semimembranosus (SM) roasts from crossbred beef steers fed diets containing barley (control) or 40% wheat or corn dried distillers grains with solubles (DDGS) or their blend. Left inside rounds from 48 steers (12 per diet) were frozen for one year before testing. A portion of each SM was injected with a salt/phosphate brine (20% extension to deliver 0.85% sodium chloride and 0.40% sodium tripolyphosphate). Injected and non-injected roasts were cooked in a water bath (72°C). Proximate, pH, Warner-Bratzler (WB) shear, water holding and thiobarbituric acid reactive substances (TEARS) analyses were conducted over 56 d of storage (4°C).No dietary effects (P<0.05) were observed for meat quality, processing attributes, or WB shear values of non-injected roasts. Injected roasts from animals fed corn DDGS had the lowest brine pickup and highest WB shear values.Raw non-injected meat from steers fed a DDGS diet was less oxidatively stable, as determined using TBARS. Oxidative changes due to diet were mitigated in the cooked injected roasts due to the chelating effect of phosphate, which also lowered overall TBARS values. TBARS values of the pre-cooked SM roasts remained below levels where rancidity is normally detected over 56 days of refrigerated storage (4°C). Overall, feeding 40% wheat DDGS, 40% corn DDGS or their blend had no negative effects on meat quality of raw SM or value-added products such as pre-cooked enhanced roasts.