Performance evaluations for economically important milk production traits are the bases for genetic evaluation, planning breeding program and selection for dairy cows. This study was intended to evaluate milk production traits of pure Jersey dairy cows at Adea-Berga Dairy research center. The data collected from 1986 to 2019 from a herd maintained at Adea-Berga dairy research center was used to estimate milk production traits (lactation milk yield (LMY), daily milk yield (DMY) and lactation length (LL)). A general linear model procedure of the Statistical Analysis System (SAS, version 9.0) was used to analyse the milk performance data. The result of fixed-effect analysis revealed that the influence of year and parity caused significant (p<0.0001) variation in all milk production traits. However, season of calving does not significantly affect milk production traits. Knowledge on the effect of these non-genetic factors for milk production would help in making management decisions for improvement of the herds. The overall least squares mean (LSM±SE) for LMY, DMY and LL were 2166.10±26.71 Litres, 6.37±0.05 Litres and 344.89±3.81 days, respectively. In conclusion, the results of this study suggest that the improvement of milk production traits of the pure Jersey cattle population at Adea-Berga dairy research center is possible through improving the level of feeding, breeding and health management than through genetic selection.