In order to survey effective factors on economic traits in Montbeliarde and Sarabi cows this study was done. Traits were studied in research include Milk Production (MP), Days In Milk (DIM) and Calving Interval (CI) in Montbeliarde and Sarabi cows. Factors that were putted as variable in models for each trait proportionally include the effect of sire, dam within sire groups, month, season, the year of the calving, lactation number, days open and dry period. Least squares method was used because of unequal observations in subgroups. Model fitting was carried out using restricted maximum likelihood with DFREML. Heritability was estimated for milk production of Montbeliarde and Sarabi cows 0.23±0.07 and 0.28±0.09 for Montbeliarde and Sarabi cows days in milk 0.16±0.05 and 0.13±0.06 and for calving interval in Montbeliarde and Sarabi cows was calculated 0.12±0.03 and 0.10±0.04, respectively. Repeatability for milk production in Montbeliarde and Sarabi cows was estimated 0.39 and 0.32, respectively.

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