6 research outputs found

    Mitochondrial abundance and efficiency contribute to lean color of dark cutting beef

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    Beef carcasses exhibiting four levels of dark cutting severity (DCS): Severe,Moderate,Mild, and Shadywere compared to Control carcasses to investigate biochemical traits contributing to the dark cutting condition. Color attributes of Longissimus lumborum (LL) were measured after grading and during simulated retail display. Mitochondrial abundance and efficiency, bloomed oxymyoglobin, reducing ability, glycolytic potential, myoglobin concentration, and protein solubility and oxidation were determined. Glycolytic potential and lactate concentrations decreased (P \u3c 0.05) as DCS increased. Residual glycogen was greater (P \u3c 0.05) in steaks from Control carcasses compared to DCS classes. Generally, as DCS increased, LL steaks were darker and less red in color (P \u3c 0.05). Increased (P \u3c 0.05) oxygen consumption and reducing ability coincided with greater myoglobin concentration and greater abundance of less efficient mitochondria as DCS increased (P \u3c 0.05). These data suggest the dark cutting condition is associated with greater oxidative metabolism coupled with less efficient mitochondria resulting in depletion of glycogen during stress

    Assessment of Postmortem Aging Effects on Texas-style Barbecue Beef Briskets

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    Palatability traits (tenderness, juiciness, flavor, and overall liking) of beef briskets ( = 48) were evaluated for 3 different postmortem aging period comparisons: 7 d vs. 21 d (Set 1), 21 d vs. 35 d (Set 2), and 7 d vs. 35 d (Set 3). Briskets were prepared as Texas-style barbecue by seasoning with salt and pepper and smoking with oak wood over a long period (approx. 11 h) using a commercial oven designed for such purposes until deemed tender (approx. 85°C internal temperature). Within each treatment set, Warner-Bratzler shear (WBS) force measurements did not differ ( > 0.05) between aging days; however, WBS force measurements for point ( composed of the ) were lower ( 0.05) detect differences between aging days within each set for overall liking, flavor liking, tenderness liking, and juiciness liking. Conversely, differences were found between brisket point and flat portions; Set 1 differed for flavor liking (flat > point; = 0.0348) and juiciness liking (point > flat; = 0.0004), Set 2 differed for overall liking (flat > point; = 0.0499) and juiciness liking (point > flat; point; = 0.0296) and juiciness liking (point > flat; = 0.0112). Our findings indicate postmortem aging did not improve beef brisket palatability, but we did note differences between point and flat portions. Preparing beef briskets as Texas-style barbecue resulted in products with low WBS values and high consumer palatability ratings, which helps demonstrate why barbecued briskets are so popular

    A Research Communication Brief: Gluten Analysis in Beef Samples Collected Using a Rigorous, Nationally Representative Sampling Protocol Confirms That Grain-Finished Beef Is Naturally Gluten-Free

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    Knowing whether or not a food contains gluten is vital for the growing number of individuals with celiac disease and non-celiac gluten sensitivity. Questions have recently been raised about whether beef from conventionally-raised, grain-finished cattle may contain gluten. To date, basic principles of ruminant digestion have been cited in support of the prevailing expert opinion that beef is inherently gluten-free. For this study, gluten analysis was conducted in beef samples collected using a rigorous nationally representative sampling protocol to determine whether gluten was present. The findings of our research uphold the understanding of the principles of gluten digestion in beef cattle and corroborate recommendations that recognize beef as a naturally gluten-free food

    National Beef Tenderness Survey–2015: Palatability and Shear Force Assessments of Retail and Foodservice Beef

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    Beef retail steaks from establishments across 11 US cities and beef foodservice steaks from establishments in 6 US cities were evaluated using Warner-Bratzler shear (WBS) force and consumer sensory panels. The average post-fabrication aging time of steaks at retail establishments was 25.9 d with a range of 6 to 102 d, and those from foodservice establishments averaged 31.5 d with a range of 3 to 91 d. The retail steaks with the lowest WBS value ( < 0.05) was the boneless top loin, compared to the top round steaks, which had the higher ( < 0.05) average WBS value. For the foodservice sector, top loin and ribeye steaks had the lowest ( < 0.05) WBS values, whereas the top sirloin represented the highest ( < 0.05) WBS values. The top blade retail steaks received among the highest consumer ratings ( < 0.05), whereas the top round and bottom round steaks received among the lowest ( < 0.05) consumer ratings for overall liking, tenderness liking, tenderness level, flavor liking, and juiciness liking. For the foodservice sector, the ribeye and top loin steaks were rated higher ( < 0.05) than top sirloin steaks for all consumer rating categories. The WBS values and sensory ratings were comparable to previous surveys, indicating no substantial changes in tenderness. Additional emphasis in improving the tenderness of top and bottom round steaks is necessary to increase consumer acceptability of these cuts
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