Suplementação para bovinos de corte em pastagem tropical Brachiaria brizantha cv. Xaráes

Abstract

The objective was to evaluate the protein and energy supplementation on the performance, nutritional characteristics and emission of greenhouse gases (GHG) of cattle kept in brachiaria tropical brizantha cv. Xaraés. 36 non-castrated steers were used, crossed ½ Angus x ½ Nellore blood, with 11 months and an average initial weight of 280 kg. The experimental design used was the randomized, with four procedures, with two repetitions of treatment, totaling 9 new ones per treatment, which were the main factors: S0 = control (without supplement). SE 0.5 = energy supplement offered based on 0.5% of body weight. SE1 = energy supplement offered as a function of 1% of body weight and the protein content was equal to pasture. SP 0.5 protein supplement offered as a function of 0.5% of body weight and the CP content of the diet equal to 16%. There was a significant difference (P <0.05) for forage consumption for total dry matter, crude protein, organic matter and digestible organic matter for the SE tests 0.5% and 0.5% SP. The levels of concentrated and uninfluenced protein supplements (P> 0.05) or ruminal PH, however, showed variation in the reactions of ruminal ammonia nitrogen, non- serum urea nitrogen and urine nitrogen excretion. Supplemented animals had higher average daily gain and higher final body weight or treatment with 0.5% SP, with an average greater than 1.27 kg / day and 355.98 kg / day, respectively, for the various variables. influences average daily gain and weight gain. It did not influence the emission of greenhouse gases. However, there were differences in the methane emission per period in the day or in the afternoon emitted more gases. In view of the results achieved, if you use supplements for animals on pasture it has improved their nutritional performance, however it has not influenced the reduction of greenhouse gas emissions.