Consumo de ração, conversão alimentar e ganho de peso em frangos de corte alimentados com óleos ácidos: revisão sistemática e meta-análise em rede

Abstract

Acid oils (AO) are by-products of oil refining for human consumption, and have been used as an alternative energy source to soybean oil (SO) in poultry nutrition. Therefore, this systematic review was based on 13 studies published on electronic platforms, for the network meta-analysis in order to evaluate the effects of AO use on feed intake (FI), feed conversion (FC) and weight gain (WG) in broilers. The response variables were analyzed using an inverse variance heterogeneity model (IVhet) through the standardized mean difference between birds fed diets containing AO vs SO (positive control) or not (negative control). The meta-analysis demonstrated that AO supplementation does not affect FC compared to SO, but favors FI compared to non-oil supplemented diets. Feed conversion was worse in birds fed diets containing acid soy oil (ASO) compared to SO, while 50% ASO + SO mixture was enough to make FC equivalent to SO. Among the most studied acid oils, diets with ASO had better FC compared to diets without oil. Broilers fed diets without oil have lower WG compared to SO or ASO. To maintain the broilers performance, in the SO absence it is preferable to use acid oils rather than to use no oil in the diet formulation.