Características pós-abate de novilhas suplementadas com diferentes fontes energéticas em pastagem de Tifton 85

Abstract

The objective of the present study was to evaluate the effect of three different energy sources on carcass characteristics, non-carcass components and meat quality of heifers finished in Tifton 85 pasture. Thirty heifers were used, with age and initial weight of 26 months and 274.5 kg, originating from the rotational cross between the Charolais and Nelore races. The experimental design was completely randomized. The animals were distributed evenly for weight and genetic group in three energy sources: corn grain, white oats or barley, the level of supplementation was 1% PV. The mean cold carcass weight and yield was 218.2 kg and 53.5%. The subcutaneous fat thickness was 4.37 mm, the metric measures, percentage of tissues, primary cuts and sensorial characteristics of the meat were not altered by feeding strategies. The slaughter weights (SW), empty body weight (EBW) and the EBW/SW ratio were similar between the supplementation strategies. The total organ weight of 100 kg EBW was higher for heifers fed corn than those receiving white oats, with intermediate behavior for females receiving barley, 3.43; 3.22 and 3.29%, respectively. The weight of rumen-reticulum relative to 100 kg of EBW was 11% higher for females that received barley than those that received white oats, and intermediate behavior for corn, 1.72; 1.55 and 1.63% PCVZ, respectively. The weight of the gastrointestinal tract, peripheral components and discarded fats did not differ between the energy sources used. White oat grain or barley may replace corn grain and provide adequate development of the carcass of beef cattle in Tifton 85 pasture.