EVALUATION OF A NONINVASIVE TECHNIQUE FOR MEASURING FAT-FREE MASS IN POULTRY

Total body electrical conductivity (TOBEC) has been successfully used to predict fat-free mass and lipid content in various species of mamma ls and birds. In the current trial, TOBEC was used to predict fat-free mass in broiler chicks through 14 d posthatch. To accomplish this, a calibration equation was developed and then tested for accuracy of pre diction. It was determined that two calibration equations (hatch to 4 d and 6 to 14 d) were necessary to predict growth. Equations including only the TOBEC reading had R2 values of .92 (6 to 14 d) and .96 (hatc h to 4 d). Equations including additional measures of length or weight had slightly improved R2 values. Through the verification of the cali bration equations it was found that when the equations were used in th e appropriate range, 95% of the variation in fat-free mass was explain ed. It was determined that TOBEC measures can be used to predict fat-f ree mass in live broiler chicks to 2 wk posthatch.