Uso de lipase e emulsificante em rações de frangos de corte

Abstract

The inclusion of emulsifier and lipase in poultry feeds is related to possible improvements in lipid digestion and increased availability of metabolizable energy, with the effect of improving the performance of broilers. The objective of this study was to evaluate the addition of emulsifier and lipase in broiler rations and their effects on performance, organ biometry and nutrient digestibility. A total of 1960 male chicks (40.04 g ± 0.341) were used at one day of age. The chickens were distributed in a completely randomized design with seven treatments and seven replicates. The treatments were constituted as follows: Treatment 1: Positive Control - CP (3000, 3100, 3200 and 3250 Kcal / kg of Metabolizable Energy (ME) of the ration for the preinitial, initial, growth and slaughter phases, respectively); Treatment 2: CP with reduction of 30 Kcal / kg of MS; Treatment 3: CP with reduction of 60 Kcal / kg of MS; Treatment 4: CP with reduction of 90 Kcal of MS; Treatment 5: CP with reduction of 90 Kcal of MS + exogenous lipase inclusion (10000 U / kg); Treatment 6: CP with reduction of 90 Kcal of EM + inclusion of emulsifier (250 g / t); Treatment 7: CP with reduction of 90 Kcal of MS with the use of lipase (10000 U / kg) and emulsifier (250 g / t) from 1 to 37 days of age. Performance characteristics (weight gain (GP), feed intake (CR), feed conversion (CA), metabolizable energy consumption (CEM) and caloric conversion (CC), carcass yield, (small intestine, liver and pancreas) and the relative length of the intestine. In the study, two metabolism tests were performed in different breeding periods (11 to 21 days and 31 to 37 days) The performance characteristics were not influenced (P> 0.05) by the treatments under study in the period of 1 to 10 days of age (P <0.05) were influenced by the level of energy and by the use of additives at the end of the breeding cycle o. The reduction of energy and the use of additives not affect (P> 0.05) on carcass traits, organ weight and length at 37 days of age. The use of emulsifier and lipase did not provide significant gains on lipid digestibility and on energy utilization, which could explain the observed improvement in performance. Thus, it can be concluded that reductions in the level of metabolizable energy of the ration compromise the weight gain and feed conversion of the broilers at the end of the breeding period. The inclusion of lipase and emulsifier improves the performance in diets with energy reduction, although it does not improve the nutrient and energy utilization of the rations.