COMPOSIÇÃO BROMATOLÓGICA, ENERGIA METABOLIZÁVEL E DIGESTIBILIDADE DE NITROGÊNIO E EXTRATO ETÉREO DE AMOSTRAS DE MILHO E SORGO PARA FRANGOS DE CORTE EM DIFERENTES IDADES

This study aimed to determine the chemical composition, apparent metabolizable energy (EMA ) and nitrogen corrected (EMAn ) , digestibility of nitrogen (N) and ether extract (EE) of corn , and four varieties of sorghum , and compare the values for chickens at a young age and slaughter . For this , it was proceeded two metabolism trials , using male broilers chicks of CobbAvian 48 lineage. In the first trial 90 birds of 14 at 21 days of age were divided into six treatments with five replications. Was tested four samples such as food grain sorghum , a commercial and research samples parental AS4620 , AS4610 and DKB550 , a commercial grain and corn. Then, 45 of 33 broilers at 40 days of age, three treatments with five replications were used. Foods tested were commercial maize and sorghum. The method was based in the total collection of excreta digestibility of this procedure, the ingested food every five days was related to excreta produced by birds in each cage in the period . The parental strains of sorghum performed better composition. From 14 to 21 days of age N digestibility was higher than corn grain sorghum tested. There was interaction between food and testing on the digestibility of nitrogen ( p < 0.05 ) at the ages tested. The digestibility of EE was statistically different for corn and sorghum, regardless of age, the corn had 1.99 % more digestible. The EMA, EMAn and EE, was better from 33 to 40 days of age. Thus, the results suggest sorghum as a probable replacement of corn in diets for broilers and poultry slaughter age had higher EMA, EMAn, N digestibility and EE.