The relationship among body measurement, age groups and body weight were studied in 24 yak bulls aged 2–5 years and above. Yak bulls were grouped according to their age. Various body measurements in different age groups differed significantly (P<0.01). Different body measurements are positively and significantly (P<0.01) correlated with each other and body weight was positively and significantly (P<0.01) correlated with different body measurement.