Desempenho e saúde de frangos de corte não são prejudicados em função do teor de metanol da glicerina incluída em dietas

Abstract

RESUMO.-Em função da grande variabilidade na composição da glicerina oriunda do biodiesel, torna-se imprescindível a busca por informações que contribuam estabelecê--la com uma alternativa na alimentação de aves. O objetivo deste estudo foi avaliar o efeito da inclusão de glicerina com alto de teor de metanol em dietas para frangos de corte sobre o desempenho e parâmetros sanguíneos. Due to the great variability in the composition of glycerin derived from the biodiesel, it is essential to search for information which helps establish it with an alternative in poultry feed. The aim of this study was to evaluate the effect of inclusion of glycerin with high methanol content in diets for broilers on performance and blood parameters. They used 90 Cobb male broiler chicks with 8 days old, distributed in a completely randomized design with three treatments (0, 6 and 12% glycerin inclusion levels) and six replications of five birds each, a total of 18 experimental units. Diets were formulated based on corn and soybean meal to meet the nutritional requirements and glycerin used contained 1.4% methanol and 3158Kcal/kg of metabolizable energy. At 21, 33 and 42 days of age the remains of feed and the birds were weighed to determine the feed intake, body weight, body weight gain and feed conversion. Were collected 1 to 3ml of venous blood of the birds during the last days of each phase (19 to 21, 31 to 33 and 40 to 42 days of age) for determination of hematocrit, hemoglobin concentration, reticulocyte total plasma proteins and fibrinogen. To evaluate the serum biochemistry were collected venous blood of birds without anticoagulant, only in the final phase (40 to 42 days). Performance data, hematological and biochemical obtained were submitted to analysis of variance. We used the Tukey test with α = 0.05 probability, to compare the means. There were no statistical difference between the treatments on the performance parameters and biochemical and blood parameters, except plasma proteins for between 19 and 21, which increased with the inclusion of glycerin, and reticulocytes that reduced with the inclusion of glycerin. The inclusion of up to 12% glycerin with 1.4% residual methanol in broiler diets (8 to 42 days of age) can be performed without loss in performance and health.

Scientific Article Dietary electrolyte balance on serum hematological and biochemical parameters of broilers under heat stress

“…There was no variation in the erythrocyte parameters, in the total plasma proteins and in the number of lymphocytes, eosinophils, basophils and monocytes for this phase for the levels of DEB tested, similar to the one observed by Laganá et al[30] and Xie et al[12]. A value above the species reference for Het was observed in all levels tested except for the level 305 mEq/kg, however this heterophilia is questionable because, in works already carried out with broilers aged around 42 days in the same region, average values for this variable around 7020 µL were observed[29], similar to what was observed in this study for this phase, excepting for 110 mEq/kg level, where we observed a Het level above this average, therefore presenting heterophilia.For all DEB levels the H/L ratio was above what is considered ideal for species, according to Gross and Siegel[31], there are three values based on the H/L ratio that can be used to characterize stress levels in broilers. In this classification, the value 0.2 would indicate a mild degree of stress; 0.5 intermediate or moderate stress and 0.8 high stress, howeverMacari and…”

“…As the reference values are not always suitable for all populations, these are probably normal values for animals in this production phase, under local environmental conditions. Likewise, the heterophilia observed at levels 175, 240 and 370 mEq/kg, is questionable, as in studies already carried out in the same region, mean values of around 6412 μL have already been observed for broilers aged around 21 days [29], similar to that observed at this stage.…”

“…As the reference values are not always suitable for all populations, these are probably normal values for animals in this production phase, under local environmental conditions. Likewise, the heterophilia observed at levels 175, 240 and 370 mEq/kg, is questionable, as in studies already carried out in the same region, mean values of around 6412 µL have already been observed for broilers aged around 21 days[29], similar to that observed at this stage.In this study, it was observed that in the 22 -42 days of age of the birds, there was a quadratic effect (p <0.05) for the Leu and Het variables and a linear effect for the H / L variable as a function of the DEB levels tested. There was no variation in the erythrocyte parameters, in the total plasma proteins and in the number of lymphocytes, eosinophils, basophils and monocytes for this phase for the levels of DEB tested, similar to the one observed by Laganá et al[30] and Xie et al[12].…”

Performance, Carcass Traits, Biochemical and Hematological Profile, Ileal Microbiota and Nutrient Metabolizability in Broilers Fed Diets Containing Cell Wall of Saccharomyces Cerevisiae and Piperine

“…The values found in this research are higher than those found by Cardoso et al (2009). These proteins make up 20% of the blood and help maintain osmotic pressure, regulate the acid-base mechanism of the blood, and provide immunoglobulins (Dourado et al, 2017), with an increased concentration in the bloodstream.…”

“…The concentration of blood urea may be influenced by liver activity, since the liver is the main organ of its synthesis (Dourado et al, 2017) and its concentration in non-carnivorous birds is 0 to 5 mg d / L (Schmidit et al, 2007); the broilers fed the ration containing avilamycin showed levels above the mentioned range, which may characterize a bird's renal overload.…”