Estratégias para a redução do uso de fontes convencionais de fósforo em rações de frango de corte

Abstract

There is a growing demand from broiler nutritionists to optimize the use of ingredients through a reassessment of nutritional requirements, and the use of tools such as exogenous enzymes. Thus, the aim of this study was to evaluate strategies that allow the reduction of the use of conventional sources of inorganic phosphorus for broilers. 1000 female day-old Cobb chicks were used. A completely randomized design was adopted, containing 4 treatments and 10 repetitions, being: T1 - dicalcium phosphate + exogenous phytase (1000 FYT / kg); T2- meat and bone meal + exogenous phytase (1000 FYT / kg); T3- commercial product Tricinophos (Nutrivet, São Carlos, São Paulo, Brasil); T4- the concept of high dosing of exogenous phytase (2000 FYT / kg) with additives with bias was used to potentially improve bone formation and intestinal health of birds, without any conventional source of inorganic phosphorus. Weight gain, feed intake, feed conversion, creative viability, productive efficiency index, cost per bird cost per unit of gain (CAPUG) were evaluated. In general, birds fed diets that did not contain conventional sources of phosphorus obtained lower zootechnical results than the control groups, although the viability of rearing was not influenced by the groups. The group of birds fed diets containing meat and bone meal obtained better results for food cost per unit of gain, given the low cost of this ingredient and the achievement of superior zootechnical results. The results showed that the strategies used were not effective for the total replacement of conventional sources of phosphorus. Further studies are recommended for a complete understanding of animal requirements and the performance of technologies associated with the concepts of use of Tricinophos and high dosing of phytase.