Desempenho e parâmetros bioquímicos e hematológicos de frangos de corte em dietas com diferentes níveis de vitamina E nas fases inicial e crescimento

Abstract

The objective of this experiment was to evaluate vitamin E levels on performance, meat quality and immunological factors of broilers from 8 to 35 days of age. A total of 288 male Cobb 500 broiler chicks were bred until the eighth day according to the lineage recommendations and fed only 50% of the vitamin E requirements. Then, a completely randomized design (DIC) was distributed in four treatments (50%, 100%, 150%, 200% Vit. E) and six replications, with twelve animals per experimental unit. Feed intake, weight gain, feed conversion, body weight, weight of immune organs (Spleen and Bursa of Fabricius) and edible viscera (heart, liver and gizzard), weight and length of the intestine were evaluated. weight, carcass yield and prime cuts (breast, thigh and drumstick), abdominal fat, meat physical quality (pH, lightness, yellow content, red content, shear force, cooking weight loss / PPCO and concentration of Malonaldehyde (TBARS), hematological parameters, serum and muscle biochemistry. There was increasing linear effect for yellow content (b*), and decreasing effect for oxidation profile (TBARS). There was no influence on hematological profile, differential leukocyte count and biochemical analyzes. There was also no effect of vitamin E levels on weight gain, feed intake, feed conversion, edible viscera weight, noble cuts yield, abdominal fat deposition, luminosity (L *), fat content. red (a *), meat pH and temperature (TEMP), cooking weight loss (PPCO) and shear force (FC). The different levels of vitamin E did not affect the productive performance characteristics, but positively influenced the malonaldehyde concentration (TBARS) and the yellow content, however, influenced important parameters for meat quality. The hematological variables showed no changes, but as the levels of vitamin E in the diets increased, the immunological profile of the birds was improved. It was concluded that the lowest vitamin E level of 50%, corresponding to 22.90 mg/kg and 18.05 mg/kg for the period 8 to 21 and 22 to 35 days, respectively, met the nutritional requirements of the birds.