title: Effects of postmortem calcium chloride injection on meat palatability traits of strip loin steaks from cattle supplemented with or without zilpaterol hydrochloride.
abstract: An experiment was conducted to determine the effects of zilpaterol hydrochloride mM supplementation (ZH; 8.3 mg/kg on a DM basis for 20 d) and calcium chloride injection [CaCl(2), 200 at 5% (wt/wt) at 72 h postmortem] on palatability traits of beef (Bos taurus) strip loin steaks. Select (USDA) strip loins were obtained from control (no ZH = 19) and ZH-supplemented carcasses (n = 20). Right and left sides were selected alternatively to serve as a control (no INJ) or CaCl(2)-injected (INJ) and stored at 4°C. Before injecting the subprimals (72 h postmortem), 2 steaks were cut for proximate, sarcomere length, and myofibrillar fragmentation index (MFI) analyses. At 7 d postmortem each strip loin was portioned into steaks, vacuum packaged, and aged for the appropriate period for Warner-Bratzler shear force (WBSF; 7, 14, 21, and 28 d postmortem), trained sensory analysis (14 and 21 d postmortem), purge loss (7 d), and MFI (3, 7, 14, 21, and 28 d postmortem). Results indicated steaks from both ZH supplementation and INJ had reduced WBSF values as days of postmortem aging increased. The WBSF values of ZH steaks were greater (P < 0.05) than no ZH steaks at each postmortem aging period. The INJ steaks had lower WBSF values (P < 0.05) than non-injected steaks. A greater percentage (91 vs. 71%) of steaks had WBSF values < 4.6 kg from steers with no ZH supplementation at 7 d postmortem, but the percentage did not differ (P > 0.05) due to ZH at 14, 21, or 28 d or due to INJ at any aging period. Trained panelists rated tenderness less in ZH steaks than steaks with no ZH at 14 d and 21 d. However, INJ improved (P < 0.05) the tenderness ratings and flavor intensity of the trained panelists, compared with their non-injected cohorts at 21 d. Zilpaterol hydrochloride supplementation reduced (P < 0.05) MFI values, but INJ resulted in greater (P < 0.05) MFI values compared with no INJ. Subprimals from ZH and INJ showed greater purge loss (P < 0.05). Although no interactions were found with ZH and CaCl(2), injecting USDA Select strip loins from ZH-fed cattle can help reduce the normal WBSF variation as it does in steaks from non-ZH-fed cattle.
authors.affiliation: Department of Animal and Food Sciences, Texas Tech University, Lubbock 79409, USA.
authors.forename: A
authors.initials: A
authors.lastname: Rodas-González
authors.forename: S B
authors.initials: SB
authors.lastname: Pflanzer
authors.forename: A J
authors.initials: AJ
authors.lastname: Garmyn
authors.forename: J N
authors.initials: JN
authors.lastname: Martin
authors.forename: J C
authors.initials: JC
authors.lastname: Brooks
authors.forename: S M
authors.initials: SM
authors.lastname: Knobel
authors.forename: B J
authors.initials: BJ
authors.lastname: Johnson
authors.forename: J D
authors.initials: JD
authors.lastname: Starkey
authors.forename: R J
authors.initials: RJ
authors.lastname: Rathmann
authors.forename: P E
authors.initials: PE
authors.lastname: de Felicio
authors.forename: M N
authors.initials: MN
authors.lastname: Streeter
authors.forename: D A
authors.initials: DA
authors.lastname: Yates
authors.forename: J M
authors.initials: JM
authors.lastname: Hodgen
authors.forename: J P
authors.initials: JP
authors.lastname: Hutcheson
authors.forename: M F
authors.initials: MF
authors.lastname: Miller
mesh_terms: D000318:Adrenergic beta-Agonists / Q000008:administration & dosage / Q000378:metabolism*; D000821:Animal Feed; D000818:Animals; D002122:Calcium Chloride / Q000494:pharmacology*; D002417:Cattle / Q000502:physiology*; D019587:Dietary Supplements; D008297:Male; D008460:Meat / Q000592:standards*; D011897:Random Allocation; D014297:Trimethylsilyl Compounds / Q000008:administration & dosage / Q000378:metabolism*
chemical_list: D000318:Adrenergic beta-Agonists; D014297:Trimethylsilyl Compounds; C475840:Zilpaterol; D002122:Calcium Chloride