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Title:Effect of ractopamine hydrochloride (Paylean®) on fresh meat and further processing characteristics of muscles from the shoulders of finishing pigs
Author(s):Tavarez, Marcos
Advisor(s):Killefer, John
Department / Program:Animal Sciences
Discipline:Animal Sciences
Degree Granting Institution:University of Illinois at Urbana-Champaign
Pork shoulder
meat quality and processing
Abstract:Ractopamine hydrochloride (RAC), a β-adrenergic agonist, increases muscle mass and decreases fat deposition in the pig. Though RAC has been extensively studied, to date no experiments have quantified its effect on the pork shoulder. Therefore, the objectives of this study were to characterize the effects of RAC on fresh meat and further processing characteristics of muscle from the shoulder of finishing pigs. Two hundred and forty shoulders originating from 120 carcasses (60 barrows and 60 gilts) were selected from a commercial population of pigs. This study was designed as a 2 x 2 factorial in a randomized complete design. Factors were RAC inclusion in the diet (0 mg/kg or 7.4 mg/kg) and sex (barrow or gilt). Paired shoulders (120 right sides and 120 left sides) were transported from a federally inspected harvest facility under refrigeration to the University of Illinois Meat Science Laboratory for evaluation. Subsequently, right and left shoulders were separated and designated for 2 separate experiments. Experiment 1 used the right shoulder to determine further processing characteristics. Cottage bacon was manufactured from cured and smoked CT Boston butts. Experiment 2 used the left shoulder to determine fresh meat characteristics. Due to the lack of interactions (P > 0.05) during both experiments, data were reported as main effect means. Pigs fed RAC had greater carcass weight (P = 0.09) and loin depth (P = 0.03) than controls. Inclusion of RAC increased shoulder cutability. Feeding RAC decreased Boston butt fat content (P = 0.01). In contrast, RAC inclusion had no effect on picnic fat content (P = 0.86). Inclusion of RAC also increased Boston butt salt soluble proteins (SSP) extractability (P = 0.03) at 0.5 % salt concentration. Surprisingly, RAC inclusion also improved (P = 0.03) picnic SSP extractability at 1.5% salt concentration. Feeding RAC had no effect on cottage bacon percent cooked yield (P = 0.33). However, RAC inclusion reduced (P < 0.01) cottage bacon fat content, and had no effect on protein content (P = 0.50). In addition, RAC improved loin end (P = 0.07), middle end (P = 0.07), and blade end (P < 0.01) slice lean area. Cottage bacon from RAC-treated pigs had sensory characteristics similar to controls. Shoulders from pigs fed RAC might be of benefit to the industry because they provide more pounds of sellable products with decreased fat content and greater lean area in cured Boston butt. At the same time, no detrimental effects on processing characteristics and sensory attributes of cottage bacon were observed. These results are in agreement with most of the literature that RAC supplementation produces heavier and leaner carcasses with little to no impact on pork meat quality.
Issue Date:2011-05-25
Rights Information:Copyright 2011 Marcos A. Tavarez
Date Available in IDEALS:2011-05-25
Date Deposited:2011-05

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