This work was conductedto determine the energy requirements for broilers using the factorial method.The metabolizable energy (ME) requirements for maintenance (MEm) were determinedat 13, 23 and 32ºC (±2 C) by the comparative slaughter technique.ME requirements for weight gain were estimated considering the net efficiencyof energy utilization for growth and body energy content. The energy requirementsfor maintenance were of 159.36, 116.17, and 128.66 kcal/kg0.75/dayat 13, 23, and 32ºC, respectively, and quadratic effect of temperature(T) on the maintenance requirement (MEm=300.14 14.61 T + 0.2876 T2,r2=0.90) was detected. Metabolizable energy requirements for weightgain for males and females were of 3.72 and 3.98; 4.21 and 3.93; 4.51 and 7.04kcal/g, for the periods from 1 to 21, 22 to 42 and 43 to 56 days of age, respectively.Considering the requirements, prediction models were designed for ME requirementsusing adjustments for body weight, daily weight gain and temperature. The modelspredicted the ME requirements for broilers as redult of from breed manual recommendationsand the studied models.
