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The study was conducted on altogether 411 milch animals comprising of 172 indigenous and 239 Holstein-Friesian (HF) crossbred cows maintained under farmer's managemental system in and around Gondar (Ethiopia). Collected data were analyzed according to Least Squares Analysis to study the magnitude as well as direction of variation in their days open (DO), calving interval (CI) and number of services per conception (NSC) due to genetic and some non-genetic factors. The overall Least Squares Means for DO, CI and NSC were estimated to be 116.5242.51 days, 439.0366.34 days and 1.80.3 respectively. The genetic constitution of the animals influenced DO, CI and NSC significantly (P<0.01). Location of herd had also significant (P<0.05) effect on DO, CI and NSC. Lactation order had significant (P<0.01) effect on CI and NSC. Its effect on DO was also found to be significant (P<0.05). Variations in all the traits due to herd-size, season of calving and farming system were statistically non-significant.

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