In general, animals that show greater reactivity tend to have lower daily weight gain and lower meat quality. Undesirable values of pH24, animal reactivity and color were found when mobile cage reactivity was higher than 780, 590 and 540, respectively. The parameters of meat quality varied according to the reactivity. The correlations between ADG, pH24, and color with animal reactivity were -0.31, 0.40, 0.47 and -0.34, and -0.33 for mobile cage, 0.74, 0.71 and -0.51, for visual reactivity, respectively. There was no correlation between animal reactivity and DMI. Correlations between mobile cage and visual reactivity were 0.77, 0.56 and 0.45 in the 1st, 2nd and 3rd evaluations, respectively. Regression equations were generated for the parameters evaluated according to the values of animal reactivity. Through the study of correlation, the degree and direction of linear association on animal reactivity, performance and meat quality were established. The characteristics of meat quality were evaluated by the color, shear force and pH24 after slaughter (pH24). On the 1st, 42nd and 84th days of the experiment, two methods were used to measure the animal reactivity: animal reactivity in mobile cage and visual reactivity during handling. Performance was determined by the average daily weight gain (ADG) and average dry matter intake (DMI) estimated through the use of indicators. A total of 20 animals of the TabapuĆ£ breed and 20 animals of the Nellore breed were confined for 112 days: 28 days of adaptation and 84 days of data collection. The objective of this study was to study the animal reactivity and correlate it with performance and meat quality of cattle finished in feedlots.
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