The objective of this work was to evaluate cattle from different genetic groups finished in a feedlot and subject to the climatic conditions of the Upper Pantanal region of Mato Grosso do Sul, Brazil, according to the behavior, carcass performance and characteristics, and quality of fresh or aged meat. Eight animals from each genetic group were confined for 84 days, including: Nelore (NEL), Aberdeen Angus x Nelore (AAN) and Canchim x Nelore (CAN). The animals were slaughtered using the cerebral concussion technique and cutting of the jugular vein, followed by removal of the hide and evisceration. The data was analyzed in a completely randomized design using PROC GLM, with the means compared by the Tukey test at 5% significance. For the behavioral parameters there was no effect of breed (P > 0.05). There was a negative correlation (P < .0001) between Temperature and Humidity Index (THI) and water consumption, urination and defecation. Values of total and daily weight gain and feed efficiency were lower (P < 0.05) for NEL animals, with no difference between the AAN and CAN crossbreeds. The THI presented a negative correlation with the average daily gain and the total weight gain (P < 0.05). For the carcass variables, such as slaughter weight, hot carcass weight and carcass length, the AAN animals showed higher values (P < 0.05) than the other genetic groups. The qualitative variables evaluated did not present an interaction effect (P > 0.05). The tenderness parameters (shear force and myofibrillar fragmentation index) were lower and higher (P < 0.05), respectively, for the Aberdeen Angus crossbreed animals. It was concluded that the introduction of Taurine genes in the crossbreeds of Nelore animals is an excellent alternative for feedlot termination in the Pantanal conditions, since the behavior was not influenced by the climatic condition and the performance was superior for the AAN and CAN crossbreed animals. For the carcass and meat parameters the AAN crossbreed was best.

这项工作的目的是根据行为，car体性能和特性以及新鲜品质，评估在饲养场中完成并受巴西马托格罗索州南部潘塔纳尔地区的气候条件影响的不同遗传群体的牛或熟肉。每个基因组的八只动物被禁闭84天，包括：Nelore（NEL），Aberdeen Angus x Nelore（AAN）和Canchim x Nelore（CAN）。使用脑震荡技术将动物处死，切开颈静脉，然后将其去除皮并清除内脏。使用PROC GLM在完全随机的设计中分析数据，通过Tukey检验比较的平均值为5％。对于行为参数，没有品种的影响（P> 0.05）。呈负相关（P <。0001）在温湿度指数（THI）与耗水量，排尿量和排便量之间。NEL动物的总和日增重值和饲料效率值较低（P <0.05），AAN和CAN杂种之间没有差异。THI与平均日增重和总体重增加呈负相关（P <0.05）。对于屠体重量，屠体重量，and体重量和体长度等the体变量，AAN动物的值高于其他遗传组（P <0.05）。评估的定性变量没有交互作用（P> 0.05）。阿伯丁安格斯杂交动物的压痛参数（剪切力和肌原纤维断裂指数）分别较低和较高（P <0.05）。结论是，将牛磺酸基因引入Nelore动物的杂种是潘塔纳尔条件下育肥场终止的极佳替代方法，因为其行为不受气候条件的影响，并且对于AAN和CAN杂种动物而言，其性能更佳。对于the体和肉类参数，AAN杂种最好。