The present investigation was carried out on Siri cattle in its natural ecology with a focus on breed description to facilitate selection for better performance as well as conservation of the breed. It is revealed from the study that the majority of Siri cattle were black with white patches (64.73%) followed by black (15.8%), brown with white patches (9.89%) and brown (9.56%). The average morphometric measurements in male and female Siri cattle were 138.98±0.22 and 122.29±0.14 cm for withers height, 176.82±0.46 and 154.36±0.51 cm for heart girth, 138.40±0.79 and 103.95±0.63 cm for body length, 43.83±0.17 and 38.32±1.40 cm for face length, 47.38±0.20 and 31.17±0.12 cm for neck length, 80.47±0.14 and 69.66±0.09 cm for neck girth, 19.62±0.13 and 19.05±0.97 cm for ear length respectively. Average age at first calving, average calving interval, average lactation length, average daily milk yield and peak milk yield per day were 51.51±0.81 months, 474.69±4.70 days, 239.00±2.04 days, 2.13±0.05 kg and 3.08±0.05 kg, respectively. Overall testicular circumference was 28.03±0.13 cm in male. In female teat length was 3.66±0.06 cm. Statistical analysis of data revealed that there was no significant variation in body conformation, physical characters, reproductive and productive performances among the four groups of colour variant Siri cattle.