Data on 142 Chhotanagpuri lambs (62 males and 80 females) belonging to Deoghar district of Jharkhand were used for the present investigation. The mean body length, height at withers, chest girth, paunch girth, ear length and tail length were estimated to be 28.06 ± 0.36, 24.84 ± 0.38, 27.61 ± 0.41, 26.37 ± 0.42, 7.28 ± 0.16 and 7.97 ± 16 cm respectively for male lambs. The corresponding values for female lambs were 27.77 ± 0.34, 24.72 ± 0.29, 25.95 ± 0.38, 25.08 ± 0.38, 7.15 ± 0.15 and 7.96 ± 0.12 cm respectively. The mean of above body bio-metric at the age of 3-months were recorded as 39.48 ± 0.59, 38.61 ± 0.76, 42.72 ± 0.64, 43.91 ± 0.74, 10.83 ± 0.36 and 11.82 ± 0.39 cm for male lambs and 38.60 ± 0.53, 38.46 ± 0.61, 40.41 ± 0.63, 42.15 ± 0.72, 9.71 ± 0.34 and 10.63 ± 0.28 cm respectively for female lambs. The mean body weight of male lambs at birth, 1-month, 2-months and 3-months were estimated to be 1.82 ± 0.05, 3.49 ± 0.10, 5.36 ± 0.23 and 7.62 ± 0.34 kg, respectively. The corresponding values for females lambs were 1.71 ± 0.04, 3.11 ± 0.12, 5.01 ± 0.21 and 6.72 ± 0.32 kg, respectively.