## 3 Results
Twenty-four hours after slaughter, the pH value at 24 h in the meat from bulls in the PASTU system was higher (5.84; \(p<0.05\)), compared to the pH value (5.64) of the meat from bulls in the FELOT system and bulls in the PRIME system (5.67) (Table 4). Furthermore, the pH\({}_{24\rm h}\) of the meat from bulls in the PASTU and FELOT systems did not differ between them (\(p>0.05\)). The degree of carcass finishing was similar (\(p>0.05\)) for bulls from the three production systems (Table 4). The finishing degree attributed by trained professional from [PERSON]'s company was 1.37 on a scale of 1 to 3. This score meets the requirements of the domestic and foreign markets. The subcutaneous fat thickness (SFT) for bulls from the (FELOT) (7.5 mm) and PRIME (7.9 mm) systems, and for these two systems no difference was observed (\(p>0.05\)). The greater cover fat thickness observed in bulls finished in the FELOT and PRIME systems may be related to the energy input during the rearing and finishing period of the bulls. It is worth noting that for all systems, the EGC was above the recommended level to classify a carcass as well finished by the Brazilian system (between 3.0 and 6.0 mm). The Longissimus dorsi area (LDA) was similar (\(p>0.05\)) for bulls from the 3 systems: PASTU (113.5 cm\({}^{2}\)) and PRIME (115.9 cm\({}^{2}\)) systems compared to the LDA of bulls from the FELOT system (114.9 cm\({}^{2}\)). In fact, the size of LDA is directly correlated with carcass weight. The highest frequency of little marbling was observed in meat from PASTU bulls (16.0%). The frequency of little marbling was intermediate for bulls from the FELOT system (10.0%) and the lowest frequency for bulls from the PRIME system (4.0%). No animal with excessive marbling was observed (Table 4). The degree of marbling classified as very good was similar for the three treatments (32.0%--PASTU, 34.0% FELOT and 32.0%--PRIME). The sum of marbling classified as good and very good was 70.0%--PASTU, 62.0%--FELOT and 80.0%--PRIME (Table 4). The differences in the degree of marbling frequency can be attributed to the higher or lower nutrient density of the diets. (Table 4). \begin{table}
\begin{tabular}{c c c c c c} \hline
**Parameters** & **PASTU 1** & **FELOT 2** & **PRIME 3** & **SEM 4** & \(p\) **Value** \\ \hline \(n\) & 10 & 10 & 10 & & \\ \hline Slaughter weight, kg & 542.30 \({}^{\circ}\) & 599.50 \({}^{\circ}\) a & 580.00 \({}^{\circ}\) b & 8.845 & 0.001 \\ Hot carcass weight, kg & 295.55 \({}^{\circ}\) c & 340.09 \({}^{\circ}\) a & 323.23 \({}^{\circ}\) b & 5.891 & 0.001 \\ Cold carcass weight, kg & 291.12 \({}^{\circ}\) & 334.99 \({}^{\circ}\) a & 318.38 \({}^{\circ}\) b & 4.888 & 0.036 \\ Hot carcass dressing, \% & 54.50 & 56.73 & 55.73 & 0.565 & 0.071 \\ Cold carcass dressing, \% & 53.68 & 55.88 & 54.89 & 0.565 & 0.068 \\ \multicolumn{5}{c}{Dripping losses, \%} \\ \hline \end{tabular} \({}^{1}\)PASTU—Bulls raised on extensive Brachiara pasture and finished in feedol, \({}^{1}\)FELOT—Bulls raised on corrected and fertilized pasture and finished in feedolot, \({}^{3}\)PRIME—Bulls raised and finished in feedolut, \({}^{4}\)SEM—Standard Error of the Mean. Means followed by different letters in the same lines are different (\(p<0.05\)).  
\end{table} 
Table 3: Effect of production system on carcass parameters of crossbred bulls. Related to tissue composition, there was no effect (\(p>0.5\)) on the percentage of muscles among systems, being the average 62.35% (Table 4). However, the percentage of fat was lower (\(p<0.05\)) in bulls reared on Brachiaria pasture and finished in feedlot (PASTU) (18.50%) compared to FELOT (21.39%) and PRIME (20.18%) systems. No (\(p>0.05\)) difference was observed for the FELOT and PRIME systems. The percentage of bone tissue was higher (\(p<0.05\)) observed in bulls from the PASTU system (18.34%) compared to the percentage of bulls from the FELOT (15.85%) and PRIME (16.92%) systems. The percentages of bone tissue in these last two systems were similar (\(p>0.05\)).