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 mammals and birds. In the current trial, TOBEC was used to predict fat-free mass in broiler chicks through 14d posthatch. To accomplish this, a calibration equation was developed and then tested for accuracy of prediction. 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 (hatch to 4 d). Equations including additional measures of length or weight had slightly improved R2 values. Through the verification of the calibration equations it was found that when the equations were used in the appropriate range, 95% of the variation in fat-free mass was explained. It was determined that TOBEC measures can be used to predict fat-free mass in live broiler chicks to 2 wk posthatch.