ABSTRACT This study aimed to evaluate the effect of using 500 FTU/kg of hybrid phytase (created from three bacteria - Natuphos E), with or without xylanase and glucanase (560 TXU/kg; 250 TGU/kg) - Natugrain TS, in corn and soybean meal-based diets, with nutritional reductions in metabolizable energy (ME), Ca, and available phosphorus (AP), on performance parameters and production costs in broiler chickens. The 1875chickens were housed in boxes and distributed among 5 treatments with 15 replicates of 25 chickens each. The experiment included a positive control (the diet of which met the nutritional requirements of the birds), two negative controls (with ME reductions of 70 and 100 kcal/kg, and fixed reductions in Ca [0.16%] and AP [0.15%]), and two treatments with identical nutritional reductions in addition to enzyme supplementation. The treatments included the following: PC= positive control (basal diet (BD) corn and soybean meal); R_70 = BD with reduction of 70 kcal/kg, Ca and AP;R_100 = BD with reduction of 100 kcal, Ca and AP; R_70 + P =BD with reduction of 70 kcal/kg, Ca and AP + phytase (500 FTU/kg); R_100 + P + XG =BD with reduction of 100 kcal/kg, Ca and AP + phytase (500 FTU/kg) + xylanase (560 TXU/kg) + glucanase (250 TGU/kg). Performance parameters, carcass yield, and production costs (USD/ton chilled carcass) were evaluated. In conclusion, the reductions of 70 kcal/kg, 0.16% Ca, and 0.15% AP did not affect performance in chickens over 42 days, if diets were supplemented with hybrid phytase (500 FTU/kg). Supplementation with hybrid phytase and carbohydrases in diets with reductions of 100 kcal/kg, 0.16% Ca, and 0.15% AP led to lower production costs.

RESUMO Objetivou-se avaliar os efeitos do óleo ácido de soja (OAS) sobre coeficientes de extinção específica da oxidação (K232 e K270) e a metabolizabilidade das dietas e o desempenho produtivo em codornas. Um total de 80 codornas de duplo propósito foram usadas num experimento com duração de 56 dias. Foi utilizado um delineamento completamente ao acaso com cinco níveis de tratamentos para OAS (0, 25, 50, 75 e 100%), com oito repetições de duas aves cada, como substituto ao óleo de soja refinado (OS) incluído até um nível máximo de 8% na formulação da dieta. O índice de acidez e os coeficientes K232 e K270 mostraram um efeito linear crescente (P<0,001) com o aumento dos níveis de inclusão de OAS na formulação das dietas. Os coeficientes K232 e K270 não foram alterados com o armazenamento das rações durante 7 dias. A suplementação com OAS durante 56 dias não afetou o desempenho produtivo das codornas. Os resultados não mostraram efeitos do OAS sobre a metabolizabilidade de ingredientes, exceto para gordura bruta que exibiu um efeito quadrático decrescente até o nível de 50% de substituição do óleo de soja por OAS (y= 94,31-1,186x+0,018x2, R2= 0,28, P= 0,02). Em conclusão, a inclusão de até 8% de OAS na dieta durante um período curto de tempo (56 dias) não produz efeitos adversos no desempenho produtivo de codornas.

ABSTRACT This study evaluated the effects of soybean acid oil (OAS) on oxidation products specific extinctions coefficients (K232 and K270) and metabolizability of diets and productive performance in quails. A total of 80 dual-purpose quails were used in a 56-days experiment. A completely randomised design with five treatment levels of OAS (0, 25, 50, 75 and 100%) as a dietary replacer for soybean oil (OS) included up to 8% in the diet formulation were used, with eight replicates of two birds each. The acidity index and K232 and K270 coefficients showed a crescent linear effect (P<0.001), with increasing levels of OAS in the diet formulation. There were no changes in K232 and K270 values during 7-days of diet storage. Supplementation with OAS during 56 days has no effect on quail’s productive performance. The results showed no effects of OAS on metabolizability of ingredients except for crude fat that exhibited a quadratic effect that was decrescent to the level of 50% of OAS supplementation as soybean oil replacer (y= 94.31-1.186x+0.018x2, R2= 0.28, P= 0.02). In conclusion, dietary inclusion of OAS up to 8% in the diet during a short period of time (56-days) produce no adverse effects on productive performance of quails.