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Carcass gain of Nellore bullocks finished on pasture fed with different supplementation levels and additives

Renan Lucsa Miorin ; Leticia Custodio ; Danúbia Nogueira Figueira ; João Alexandrino Alves Neto ; ALINE DOMINGUES MOREIRA ; Michele Aparecida Prado Alves ; Flávio Dutra de Resende ; Gustavo Rezende Siqueira
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The aim of this reasearch was to detect the effect of different supplementation levels and different additives on performance of Nellore bulls finished on pasture. Eighty Nelore bullocks with initial BW 478 kg ? 19 were used in the trial that was designed in randomized blocks with four blocks and five treatments, totalizing twenty Panicum Maximum cv. Tanzania paddocks of 1 ha with four animals each. The trial period was 89-d, divided into three periods: the first 15-d and the two others 37-d each. The treatments were: supplementations of 0.5% of BW (0.5), 2.0% of BW (2.0), 2.0% of BW with virginiamycin (2.0VM), 2.0 of BW with virginiamycin and monensin (2.0VMMO) and 2.0% of BW with virginiamycin and salinomycin (2.0VMSAL). The animals were fed daily with the supplementation and additives of each treatment. To carcass gain (CG) (kg), 4 animals were slaughtered at the beginning and 16 at the end of the experiment; 4 animals per treatment. Equations were generated to determine the initial and final carcass weight. Due to the initial slaughter, it was possible to measure the average daily carcass gain (ADCG) (kg/day) and transfer carcass (TC) (ADCG/ADG)*100 (%). It was also calculated the dressing percent (DP) (%). All data were analyzed using the MIXED procedure of the SAS 9.2 program, adopting a level of significance of 10%. All treatments which got 2.0% of BW supplementation had greater DP (58.5%; P < 0.01) compared with 0.5 (53.9%). Among the treatments with 2.0%, only 2.0 (57.8%) and 2.0VM (59.2%) were different. The CG was different among treatments (P < 0.01), the 0.5 had lower gain (25 kg) and 2.0VMMO (102 kg) was greater than 2.0 (83 kg) and 2.0VMSAL (87 kg), not differing of 2.0VM (90 kg). For TC (P < 0.01), the 0.5 was lower (53.3%) and 2.0VM (85.2%) was greater than 2.0 (74.5%) and 2.0VMSAL (75.1%), not differing of 2.0VMMO (76.2%). The ADCG (P < 0.01) was lower for 0.5 (0.27 kg/day), and among treatments with 2.0% of BW the 2.0VMMO (1.13 kg/day) was greater of 2.0 (0.92 kg/day), but was not different from others. In conclusion, the supplementation of 2.0% is better than 0.5% and the best additive is the combination of virginiamycin and monesin for beef cattle finished on pasture.