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Shelf-life characteristics of steaks from steers supplemented with vitamin E and differing in USDA Quality Grade
Abstract
One hundred thirty-one Bos indicus x Brown Swiss steers of Mexican origin were assigned randomly to two Treatments (TRT): Control (CONT) (n=66) or 500 IU/day vitarnin E supplementation (VITE) (n=65) for the last 147 days of commercial feeding. Following commercial slaughter and carcass evaluation, IMPS 107 ribs were obtained based on USDA Quality Grades (QGRADE) of Select-(n=8 TRT and n=8 CONT), Choice-(n=7 TRT and n--9 CONT) and Choiceo (n=6 TRT and n=6 CONT) within TRT. Both TRT had similar feedyard and carcass characteristics. Dietary vitarnin E steaks showed increased CIE a*(redness) values, reduced oxidative rancidity (TBA number), and more desirable Lean Color (LCLR) and Percentage Lean Discoloration (DISCL) panel scores under simulated retail display. There was a significant TRT by shelf-life day (DAY) interaction for TBA number and Objective CIE a* values with steaks from VITE steers having more desirable TBA and CIE a* values after Day 3. Rib steak cc-tocopherol content and TBA number were dependent on the interaction of TRT and QGRADE. Vitamin E Select- steaks had lower oc-tocopherol content (I .6 gg/g) than either VITE Choice-(2.6 ttg/g) or Choiceo (2-9 gg/g) steaks. Furthermore, VITE Select-and CONT steaks were not different in cc-tocopherol content (1.5 gg/g, 1.3 gg/g, and 1.4 gg/g for CONT Select-, Choice-, and Choiceo, respectively). TBA values for QGRADE within TRT were different (P<.05) with Select-steak TBA values being higher than both CONT Choice- and Choiceo steaks as well as all VITE steaks. Linear regression and scatter plot analyses of Hue Values according to cctocopherol content for DAY 7 steaks showed an apparent cubic relationship. Panel LCLR and DISCL scores depended on the three-way interaction of QGRADE, DAY and TRT. As QGRADE increased, shelf-life characteristics were, past DAY 5, more desirable in CONT steaks, but the trend was just the opposite in VITE steaks. Control Select-, Choice-, and Choiceo LCLR scores were 2.5, 3.2 and 3.4, respectively, for DAY 7, yet TRT Select-, Choice-, and Choiceo LCLR scores were 5.2, 3.8 and 4.4, respectively. DISCL scores followed a similar trend, except Choice-and Choiceo steaks did not differ within Treatment.
Description
Due to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to digital@library.tamu.edu, referencing the URI of the item.Includes bibliographical references: 57-61.
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Citation
Tipton, Norlyn Claud (1996). Shelf-life characteristics of steaks from steers supplemented with vitamin E and differing in USDA Quality Grade. Master's thesis, Texas A&M University. Available electronically from https : / /hdl .handle .net /1969 .1 /ETD -TAMU -1996 -THESIS -T57.
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