Relationships of behavioral and physiological symptoms of preslaughter stress to beef longissimus muscle tenderness

Department of Animal Sciences, Colorado State University, Fort Collins 80523-1171, USA.
Journal of Animal Science (Impact Factor: 2.11). 11/2009; 88(3):1148-59. DOI: 10.2527/jas.2009-2183
Source: PubMed

ABSTRACT Relationships between behavioral and physiological symptoms of preslaughter stress and LM Warner-Bratzler shear force (WBSF) were investigated using Bos taurus steers (n = 79) and heifers (n = 77). Measurements of heart rate, respiration rate, rectal temperature, and concentrations of serum cortisol and plasma epinephrine were used as indicators of stress associated with physical handling and chute restraint, whereas concentrations of cortisol, glucose, lactate, and creatine kinase in blood samples obtained at exsanguination were measured to reflect physiological reactions of animals to transportation stress. Increased plasma epinephrine concentration, indicative of acute handling stress, was associated with elevated heart rate (r = 0.42, P < 0.001) and rectal temperature (r = 0.34, P < 0.001) during restraint, increased plasma lactate (r = 0.22, P = 0.006) and serum creatine kinase (r = 0.28, P < 0.001) concentrations at slaughter, and greater LM WBSF (r = 0.22, P = 0.006). Plasma lactate concentration at slaughter, which reflected an adrenergic stress response to transportation, was associated with lesser final LM pH (r = -0.30, P < 0.001) and greater LM WBSF (r = 0.26, P = 0.002). Categorical analyses of chute and posttransportation behavior scores (calm vs. restless vs. nervous) showed that cattle exhibiting adverse behavioral reactions to handling and chute restraint had increased (P < 0.05) values for plasma epinephrine concentration, heart rate, and rectal temperature during chute restraint, elevated (P < 0.05) plasma lactate concentration at slaughter, and increased (P < 0.05) LM WBSF. In addition, cattle showing behavioral symptoms of stress after transportation had greater (P < 0.05) plasma glucose and lactate concentrations at slaughter and produced LM steaks that were 0.34 kg tougher (P < 0.05) when compared with calm cattle. No carcasses were identified as dark cutters, and LM pH did not differ (P > 0.05) among behavior categories. Grouping cattle according to differences in plasma lactate concentration categorized them according to mean differences in LM WBSF. Moreover, steaks from cattle with the greatest plasma lactate concentrations at slaughter (91st to 100th percentile) had a delayed response to aging that persisted until 14 d postmortem. Stress-induced differences in LM tenderness observed in this study were independent of differences in muscle pH.

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    • "These working farms are open for public tours. Consumers also need to learn that preslaughter stress levels are similar to on-farm handling (Grandin, 1997; Gruber et al., 2010). "
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    Meat Science 11/2014; 98(3). DOI:10.1016/j.meatsci.2014.05.011 · 2.62 Impact Factor
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    • "Consistent with this, an increasing frequency of calling is often correlated with an increase in the physiological stress response (Hemsworth et al., 2011). Increased cortisol, lactate and glucose levels in exsanguination blood are useful as indicators of a preceding period of stress (Gruber et al., 2010). "
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    Livestock Science 06/2014; 164. DOI:10.1016/j.livsci.2014.03.013 · 1.17 Impact Factor
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    • "cm long line scale as described by Gruber et al . ( 2010 ) . The evaluator could not be truly blinded to the treatments chute - side as it was apparent that castrations were occurring . Marks were converted to values on a 0 to 5 line scale ( 0 = calm and 5 = aggres - sive ) , which were aimed to be indicative of the animals response to restraint ( Gruber et al . , 2010 ) . Rectal tempera - ture ( tEMP ) was collected after CS was determined on each day . All animals were weighed and assigned a CS in a hydraulic chute ( Silencer Inc . , St . Francis , KS ) on d – 5 , – 1 , 0 , 1 , 8 , 14 , 21 , and 28 . Objective exit velocity ( EV ) was collected on d – 5 , – 1 , 1 , 8 , 14 , 21 , and 28 using an infr"
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