The productive and economic performance of different beef genetic groups in a pasture-based growing system and feedlot finishing with one year cycle was evaluated. Thirty-six bulls from three groups F1Guzerat x Nellore F1 (GN); F1 Guzerá x Hosltein (GH) and F1 1/2 Simmental + 1/4 Guzerá + 1/4 Nellore (SG), with average age of 270 (± 30) days and average body weight of 241.3 (± 34.0) kg were utilized. The experimental design utilized was completely randomized (3 x 12). During the growing phase, bulls were kept in rotational Brachiaria brizantha cv Marandu pastures, receiving commercial supplement; in the finishing phase, they received a diet containing sorghum silage and concentrate (50:50) for 61 days. The performance indices evaluated were average daily weight gain (ADG), average daily gain during the period (ADP), final body weight. Economic performance indicators were total revenue, total operating expenses per bushel (COT / @), gross margin and net margin. Average daily gain during the growing phase was similar (P> 0.05) among groups with an average of 746 and 456 grams, respectively, for the period's transitional rainy / dry season. The TOE/bushel recreates the grouping of SD (R$ 69.44) was higher than that of groups GN (R$ 66.75) and GH (R$ 64.86). In the finishing period, ADG was similar (P> 0.05) among groups with an average of 1.55kg. The TOE/bushel of the feedlot finishing were R$ 91.48, R$ 114.15 and R$ 122.78 respectively for SD, GN and GH groups. Considering the analysis of the short-cycle system, we obtained the lowest TOE/bushel for grouping SD (R$77.92) followed by grouping GN (R$ 74.89) and GH (R$ 78.43). These results provided higher profitability for the crosses SD (21.99%) compared to other intersections (18.92% and 18.31% respectively, and for GN and GH). In the conditions evaluated the SD group was the most economically efficient.
production cost; production system; operating income; weight gain