The objective of this study was to evaluate the effect of previous supplementation strategies (mineral and corn-based supplementation in the growing-phase) on intake and performance of different beef cattle group genotypes in the finishing phase on pasture or feedlot. Two experiments for the finishing phase were conducted simultaneously. For Exp.1, 60 bulls were finished on tropical grass with supplementation. They were distributed in a randomized block design in a 3 × 2 factorial arrangement (three genotypes (Nellore, Senepol x Nellore (½Senepol), Angus x Nellore (½Angus)) and two growing-phase supplementation strategies (mineral and corn-based supplementation)). They were allocated to 12 paddocks with 1.8 ha of Urochloa brizantha ‘Xaraes’ per paddock (5 animals/paddock). The animals were supplemented (corn-based supplement at the rate of 20 g/kg body weight [BW]) for 125 days. For Exp.2 60 bulls were finished in individual pens. They were of three genotypes (Nellore, ½Senepol, ½Angus) from two growing-phase supplementation strategies (mineral and corn-based supplementation) and distributed in a randomized block design allocated to individual pens. In Exp.1 (finish on tropical grass), the genotypes,½ Angus and Nellore bulls showed the greatest initial (end of growing phase treatments) and final body weights (BW), final carcass weight (HCW) and hot carcass yield (HCY) than ½ Senepol bulls. Bulls with corn-based supplementation in the growing phase had greater initial (end of growing phase) and final BW and lower feed efficiency (FE) than animal supplementation with mineral in the growing phase. ½Senepol showed higher total dry matter (DM, percentage of BW) and forage DM intake than Nellore in the finishing phase. For supplement DM intake, higher values were found for the ½ Angus bulls compare ½Senepol. Nellore bulls showed greater DM and OM digestibility than ½ Senepol but no different to ½ Angus. For experiment 2 (finish in feedlot), ½ Angus and ½ Senepol bulls had higher ADG than Nellore bulls. ½ Angus and Nellore bulls presented the greatest HCW while Nellore bulls had the highest HCY. Daily carcass gain (DCG) in the finishing phase was higher in animals that received only mineral supplementation during the growth phase. ½ Angus and ½ Senepol showed higher FE than Nellore bulls. Nellore bulls had lower DMI of forage and supplement than ½ Angus and ½ Senepol. ½ Angus and Nellore bulls had greater BW at the end of the finishing phase than ½ Senepol.The feedlot-finishing system promotes better finishing performance in ½ Angus and ½ Senepol, thus crossing Nellore with a Bos taurus breed may be a strategy to improve finishing performance and carcass characteristics. Corn-based supplement during the growing phase may be a strategy to improve body weight on entry to a finishing phase, although it may reduce carcass gain in the finishing phase.

本研究的目的是评估先前的补充策略（在生长阶段补充矿物质和玉米）对牧场或饲养场育肥阶段不同肉牛组基因型的摄入量和性能的影响。完成阶段的两个实验同时进行。对于实验 1，60 头公牛在热带草上完成并补充。它们以 3 × 2 因子排列（三种基因型（Nellore、Senepol x Nellore (½Senepol)、Angus x Nellore (½Angus)）和两种生长阶段补充策略（矿物质和玉米为基础的补充）分布在随机区组设计中）。他们被分配到 12 个围场，拥有 1.8 公顷的Urochloa brizantha'Xaraes' 每个围场（5 只动物/围场）。动物被补充（以 20 g/kg 体重 [BW] 的比例添加玉米）125 天。对于 Exp.2，60 多头在单独的钢笔中完成。它们具有来自两种生长阶段补充策略（基于矿物质和玉米的补充）的三种基因型（Nellore、1/2Senepol、1/2Angus），并以随机区组设计分配给各个栏。在实验 1（在热带草上完成），基因型 ½ Angus 和 Nellore 公牛显示出最大的初始（生长期处理结束）和最终体重 (BW)、最终胴体重 (HCW) 和热胴体重 (HCY) ) 比 ½ 塞内波尔多头。与在生长阶段补充矿物质的动物相比，在生长阶段添加玉米基补充剂的公牛具有更高的初始（生长阶段结束）和最终 BW 以及更低的饲料效率 (FE)。½Senepol 在育肥阶段显示出比 Nellore 更高的总干物质（干物质，体重百分比）和饲料干物质摄入量。对于补充 DM 摄入量，发现 ½ 安格斯公牛与 ½ Senepol 相比具有更高的值。Nellore 公牛表现出比 ½ Senepol 更高的 DM 和 OM 消化率，但与 ½ Angus 没有区别。对于实验 2（在饲养场结束），½ Angus 和 ½ Senepol 公牛的 ADG 高于 Nellore 公牛。½ Angus 和 Nellore 公牛的 HCW 最高，而 Nellore 公牛的 HCY 最高。在生长阶段仅接受矿物质补充的动物在育肥阶段的每日屠宰量 (DCG) 较高。½ Angus 和 ½ Senepol 显示出比 Nellore 公牛更高的 FE。Nellore 公牛的饲料和补充物 DMI 低于 ½ Angus 和 ½ Senepol。½ Angus 和 Nellore 公牛在育肥阶段结束时的体重高于 ½ Senepol。饲养场育肥系统促进了 ½ Angus 和 ½ Senepol 更好的育肥性能，因此通过 NelloreBos taurus品种可能是提高育肥性能和胴体特性的一种策略。在生长阶段添加玉米可能是一种在进入育肥阶段时提高体重的策略，尽管它可能会减少育肥阶段的胴体增加。