Document Detail

Comparative effects of supplementing beef steers with zilpaterol hydrochloride, ractopamine hydrochloride, or no beta-agonist on strip loin composition, raw and cooked color properties, shear force, and consumer assessment of steaks aged for 14 or 21 d postmortem.
MedLine Citation:
PMID:  24879757     Owner:  NLM     Status:  Publisher    
Beef steers (n = 1,914) were assigned to one of three beta adrenergic agonist (ΒAA: ) supplementation treatments: zilpaterol hydrochloride (ZH: ; 8.3 mg/kg of DM for 20 d with 3-d withdrawal), ractopamine hydrochloride (RH: ; 308 mg/hd/d for 28 d), or no βAA (CON: ) to determine the effects on consumer eating quality. Strip loins (n = 1,101; CON = 400, RH = 355, ZH = 346) were obtained and fabricated into 2.5 cm thick steaks for proximate, Warner-Bratzler (WBSF: ) and slice shear force (SSF: ), and consumer analyses; steaks were aged until 14 or 21 d postmortem. Fat and moisture contents were not affected by βAA supplementation (P > 0.05), but strip steaks from steers fed ZH had more protein (P < 0.01) than CON or RH, which were similar. An interaction between βAA and aging was observed (P < 0.01) for WBSF, but not SSF. Within steaks aged 14 d, ZH steaks required the most force to shear, RH were intermediate, and CON had the lowest WBSF values; however, RH had a stronger response to aging than CON or ZH, resulting in the lowest WBSF values at 21 d. SSF values were greater (P < 0.01) in steaks from steers fed ZH than CON or RH, which did not differ. Following shear force analyses, steaks within 2 SD of each treatment mean for WBSF were selected randomly for consumer assessment of eating quality. Consumer testing (n = 400; 200/postmortem aging period) was arranged in a 3 × 3 factorial representing 3 quality grades [Select (SEL: ), Low Choice (CHO: ), and Premium Choice (PCH: )] and 3 treatments (ZH, RH, & CON). In steaks aged 14 d, βAA supplementation affected (P < 0.01) tenderness, flavor and overall liking, and tenderness acceptability, resulting in lower consumer scores for ZH than CON and RH; however, juiciness, flavor, and overall acceptability were similar (P > 0.05). In steaks aged 21 d, feeding βAA only influenced (P < 0.01) tenderness and juiciness scores. Despite these differences, βAA did not affect (P > 0.05) acceptability. Quality grade impacted (P < 0.01) all traits and acceptability in steaks aged 14 d and 21 d. In 14-d steaks, PCH typically was scored higher than CHO or SEL; however, consumers rated 21- d CHO and PCH similarly - both receiving greater scores than SEL. Consumers detected several differences in eating quality at 14 d because of βAA supplementation. Increasing aging from 14 to 21 d mitigated differences in shear force and tenderness scores because of feeding ZH, so that tenderness and overall acceptability were similar between ZH, RH, and CON.
A J Garmyn; J C Brooks; J M Hodgen; W T Nichols; J P Hutcheson; R J Rathmann; M F Miller
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-5-30
Journal Detail:
Title:  Journal of animal science     Volume:  -     ISSN:  1525-3163     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  2014 May 
Date Detail:
Created Date:  2014-5-31     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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