The objective of this study was to evaluate the digestibility, economic efficiency, and composition of breast muscle in broiler chickens fed with a diet containing corn oil as an alternative replacement to soybean oil. We evaluated feed digestibility, crude protein (CP), ethereal extract (EE), apparent metabolizable energy (AME), and apparent metabolizable energy corrected for nitrogen balance (AMEn) during two periods (17-21 and 31-35 days of age). An analysis of breast composition, feed cost (Yi), economic efficiency index (EEI), and cost index (CI) for live weight of the animal and carcass between the two oil sources was also carried out. The design was completely randomized in a 2×2 factorial design with two ingredients (soybean oil and corn oil) and two periods (17-21 and 31-35 days). Digestibility tests were performed with four replicates per treatment and two birds per pen, and tests of breast muscle composition were made with six replicates. There was an interaction between diet and age for digestibility of CP (P < 0.05), which was higher (P < 0.05) at 17-21 days using soybean oil. The digestibility of the feed was higher (P < 0.05) at 31-35 days compared to 17-21 days. The digestibility of EE was not affected (P > 0.05) by treatment or age. The use of corn oil resulted in higher (P < 0.05) AME in 17-21 day olds, and higher AME and AMEn in 31-35 day olds; there was no difference (P > 0.05) in AMEn among 17-21 day olds. In breast composition, there were no differences (P > 0.05) in deposition of EE. For CP level and dry matter (DM), corn oil showed better values, while for breast moisture, soybean oil resulted in higher levels of moisture compared to corn oil (P < 0.05). The economic viability analysis favored soybean oil. Our results suggested that corn oil can replace soybean oil in diets formulated with sorghum, since it has higher apparent metabolizable energy and resulted in better breast composition. ResumoObjetivou-se avaliar a digestibilidade, eficiência econômica e composição do músculo do peito de frangos de corte alimentados com ração contendo óleo de milho como alternativa de substituição ao óleo de soja. Foi avaliado a digestibilidade da ração, da proteína bruta (PB), do extrato etéreo (EE); energia metabolizável aparente (EMA) e energia metabolizável aparente corrigida pelo balanço de nitrogênio (EMAn); em dois períodos (17-21 e 31-35 dias). A análise da composição do músculo do peito, o custo da ração (Yi), índice de eficiência econômica (IEE) e índice de custo (IC) para peso vivo do animal e da carcaça entre as fontes lipídicas foi realizada no final da criação. O delineamento foi inteiramente casualizado em esquema fatorial 2 × 2 com dois ingredientes (óleo soja e óleo milho) e em dois períodos (17-21 e 31-35 dias). A digestibilidade foi realizada com quatro repetições por tratamento com duas aves por unidade experimental e para a composição do musculo do peito foi feito seis repetições por tratamento. Houve interação dieta e idade para a digestibilidade da PB (P < 0,05), que foi...

Aimed to evaluate the corn oil in diets based on sorghum as an alternative to replacement of soybean oil for broilers, comparing digestibility of feed, crude protein (CP) and ether extract (EE); apparent metabolizable energy (AME) and apparent metabolizable energy corrected for nitrogen balance (AMEn); between the two oils in two steps: 17-21 days and 31-35 days; The chemical analysis of the breast muscle, feed cost (Yi), economic efficiency index (EEI) and cost index (CI) for live weight and carcass between lipid sources was also performed. The design was completely randomized in a 2x2 factorial design (with ration with soybean oil and corn oil and 17-21 days and 31-35 days), and digestibility was four replicates per treatment with two birds per experimental unit for each phase and for the chemical analysis of chest with six replicates per treatment one bird per experimental unit. Was no diet x age interaction for CP digestibility, which was higher at 17-21 days using soybean oil. The digestibility of the ration was increased to 31-35 days compared to 17-21 days of age. The digestibility of EE was not altered by the treatments and the ages. The use of corn oil resulted in higher EMA to 17-21 days of age, AME and AMEn to 31-35 days of age, while there was no difference in AMEn to 17-21 days. The composition of breast, no differences in deposition of EE were found. For the deposition of CP and dry matter (DM) corn oil showed better values for moisture while breast soybean oil resulted in higher levels. The result of economic viability benefited soybean oil. Corn oil can replace soya oil in diets containing sorghum, improving the apparent metabolizable energy of feed and the composition of the breast.