### INTRODUCTION

*Bos taurus taurus*, which has a different body composition than zebu or crossbred [2], and the direct methods have been progressively abandoned for indirect methods [3].

### MATERIALS AND METHODS

### Ethical considerations

### Animal, diets and experimental treatments

### Slaughter and samplings

_{9–11}), according to the methodology described by Hankins and Howe [1], was collected, weighed, dissected, and the proportions of muscle, adipose, and bone tissue contained therein were determined. Bone tissue was also separated from the other tissues of the right half of the carcass, which were weighed to further evaluate the physical composition of the carcass.

_{9–11}. Leather samples were chopped, and tail, head, feet, and bones samples were sawed.

### Laboratory analysis

### Statistical analysis

_{0}and β

_{1}= intercept and inclination coefficient of the linear equation, under the following statistical hypothesis:

^{2}, MaF = (s

_{x}–s

_{y})

^{2}, MoF = 2s

_{x}s

_{y}(1–r), where x are the predicted values; y are the observed values; MSEP is the mean square error of the prediction; SB is the squared bias; MaF is the magnitude of random fluctuation component; MoF is the model of random fluctuation component; s

_{x}and s

_{y}are the standard deviations of the predicted and observed values, respectively; and r is the Pearson linear correlation coefficient between the predicted and observed values. Accuracy and precision of the model were evaluated by estimating the correlation and concordance coefficient (CCC) or the reproducibility index, described by Tedeschi [19]. Models were statistically evaluated using the Model Evaluation System (3.1.16) software (http://nutritionmodels.com/mes.html).

### RESULTS

### Carcass physical composition

_{0}and β

_{1}parameters (p<0.05). Both equations overestimated the amount of bone tissue in the carcass for the majority of the evaluated samples (Table 4).

### Carcass chemical composition

_{0}and β

_{1}parameters of the linear equation.

### Empty body chemical composition

_{0}of the equation, this was supported by the SB value for this equation. Thus, V06 equation were better, because most of the MSEP was not relative to the model (MoF = 39.39).