The effects of genetic and non genetic factors on performance traits (Daily Milk Yield, 305 Days Milk Yield, Total Milk Yield and Lactation Length) of primiparous Kankrej cows was studied. The least square means of daily milk yield, 305 days milk yield, total milk yield and lactation length were calculated and found 6.71±0.14, 1893.42±60.00, 1983.29±72.47 kg and 290.78±7.33 days, respectively. The season and period of calving did not affect these traits, while effects of sire was significant (*P<0.05) on 305 DMY, but it did not have any effect on the traits such as DMY, TMY and LL of primiparous Kankrej cow. On the basis of these observations, we can suggest that proper management practices as well as use of better sire will help to improve the production performance of the herd.

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