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      Zilpaterol improves feeding performance and fabrication yield of concentrate-finished cull cows.

      Journal of animal science
      Adrenergic Agents, pharmacology, Animal Feed, analysis, Animal Nutritional Physiological Phenomena, Animals, Cattle, Diet, veterinary, Feeding Behavior, drug effects, Female, Meat, standards, Muscle, Skeletal, Trimethylsilyl Compounds

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          Abstract

          The objective of this study was to quantify the effects of zilpaterol hydrochloride (ZH) on feeding performance and fabrication yield of concentrate-finished cull cows. Three hundred twenty commercial cull cows (2 to 10 yr old) were obtained from ranches in Missouri and South Dakota and assigned to 1 of 2 treatments: 1) a control diet containing no ZH and 2) a diet that contained ZH. Cows were fed for 75, 88, or 110 d, and all received the control ration until ZH treatments were initiated. Twenty-four days before slaughter, ZH feeding began for the designated treatment pens; cows were fed ZH [8.33 mg/kg (100% DM basis)] for 20 d with a 4-d withdrawal period before slaughter. No differences (P>0.05) were detected between the 2 treatment groups for initial BW or DMI. Final BW (640.5 vs. 619.1 kg), ADG for the last 24 d (2.75 vs. 2.17 kg), and G:F for the last 24 d (0.160 vs. 0.126) were greater (P<0.01) in cows fed ZH than the control cows. No differences (P > 0.05) were found for lean or skeletal maturity score, fat thickness, LM area, HCW, or calculated yield grade among the 2 treatment groups. Feeding ZH increased (P<0.01) HCW (390.1 vs. 369.2 kg), dressed carcass yield (61.01 vs. 59.45%), and LM area (93.3 vs. 86.5 cm(2)) and decreased (P<0.01) marbling score (Slight(63) vs. Slight(86)) compared with control cows. Cows fed ZH had greater (P<0.05) primal weights for chuck (mock) tender (2.63 vs. 2.28 kg), lip-on rib eye roll (13.54 vs. 12.56 kg), top sirloin butt (12.74 vs. 11.82 kg), top (inside) round (14.58 vs. 12.89 kg), and peeled knuckle (12.87 vs. 11.51 kg) while yielding a decreased percentage of mechanical knife trimmings (1.15 vs. 1.35%; P<0.01) and more top (inside) rounds (3.71 vs. 3.46%; P=0.02) than the control cows. No differences (P>0.07) were found for the remaining fabrication yield attributes. The ZH-treated cows had greater (P<0.05) fabrication dollar values for chuck (mock) tender (8.82 vs. 7.66 $/carcass), lip-on rib eye roll (64.20 vs. 59.56 $/carcass), strip loin (0 × 1; 49.13 vs. 44.75 $/carcass), top sirloin butt (35.60 vs. 33.01 $/carcass), bottom round (flat; 44.23 vs. 39.23 $/carcass), top (inside) round (60.30 vs. 53.33 $/carcass), knuckle (peeled; 44.26 vs. 39.57 $/carcass), and total salable yield (879.50 vs. 803.70 $/carcass) than control cows. These results suggest the feeding of ZH to concentrate-finished cull cows enhances production efficiencies and can add new value to the cull cow market. © 2011 American Society of Animal Science. All rights reserved.

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