| Effect of long-term corn by-product feeding on beef quality, strip loin fatty acid profiles, and shelf-life. | |
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MedLine Citation:
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PMID: 21642492 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The objective of this study was to evaluate the meat quality and shelf-life of steaks from steers fed dried distillers grains with solubles (DDGS) or dried corn gluten feed (CGF) compared to soybean meal with corn (SBM) as a protein supplement from weaning to slaughter. Angus cross steers (n = 81, BW = 306 ± 26.1 kg) were randomly assigned to pens (n = 9) and fed a stocker diet of corn silage (75% of DM) with DDGS, CGF or SBM and ground ear corn. After 84 d of stockering, 12 steers (BW = 397 ± 15.3 kg) were randomly selected from each treatment and finished using the same protein supplement at 25% of DM for 100 d. Carcass data were collected (24 h) and the longissimus lumborum was fabricated into steaks at 48 h post-mortem. Steaks were assigned to proximate analysis, Warner-Bratzler shear force (7, 14, or 21-d aging), and retail display (1, 3, 6, or 9 d). Protein source did not affect carcass yield, quality, or longissimus lumborum composition (P > 0.05). After 7 d of aging, DDGS and CGF steaks were more tender (P < 0.01) than SBM, but were similar (P = 0.30) after 14 and 21 d of aging. Feeding corn by-products did not influence subjective overall color acceptance (P = 0.17) in this study, but acceptance declined over time (P < 0.01). Subjective redness was similar (P > 0.05) among diets except SBM steaks were more red (P < 0.01) than DDGS after 9 d. On d 3 and 6 of retail display, CGF steaks exhibited more discoloration (P < 0.04) than SBM or DDGS steaks. However, after 9 d DDGS were more discolored (P < 0.01) than CGF or SBM. Objective L* was lighter for CGF (P < 0.04) over 9 d of display, and all treatments became darker (P < 0.01) as time increased. Redness (a*) declined (P < 0.01) over time with SBM steaks maintaining more color in the red spectrum than CGF and DDGS after 6 d of display. Protein source did not affect (P > 0.05) the rate of lipid oxidation. Total SFA concentrations were similar (P > 0.05) among treatments, however, total MUFA were lower (P < 0.05) and total PUFA concentrations were greater (P < 0.05) in DDGS steaks compared to SBM or CGF steaks. These data show that dried distillers grains plus solubles or corn gluten feed can be fed as a protein supplement at 25% DM from weaning until slaughter while maintaining meat quality when compared to steers fed soybean meal as a protein supplement. |
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Authors:
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J R Segers; R L Stewart; C A Lents; T D Pringle; M A Froetschel; B K Lowe; R O McKeith; A M Stelzleni |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-6-3 |
Journal Detail:
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Title: Journal of animal science Volume: - ISSN: 1525-3163 ISO Abbreviation: - Publication Date: 2011 Jun |
Date Detail:
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Created Date: 2011-6-6 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8003002 Medline TA: J Anim Sci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Animal and Dairy Science, University of Georgia, Athens, GA 30602. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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