Abstract: The present study was carried out to find the effect of sire birth weight on the Dhofari calfs breed growth traits of birth weight, weaning weight, yearling weight, pre-weaning, post-weaning daily gain, dam gestation length and calving ease score . Seasonal interaction with the sire birth weight effect on calfs growth traits was also investigated. Growth traits of calfs were classified to seasonal (cold, hot and temperate) interaction with sire birth weight class. Data of different weight records of 558 calfs and their relative dams sired by 40 Dhofari bulls breed from Salalah Livestock Research Station were used in this study. The different calfs growth traits were classified into three classes according to sire birth weights (high, medium and low). The data were analyzed by multivariate General Linear Model (GLM) using SPSS. Analysis showed significant (p<0.05) effect of sire birth weight class on all calfs growth traits. Calfs of high class sire birth weights proved to be heavier for all growth traits than sired by medium and low class bulls. There was a strong positive significant (p<0.01) correlation between sire birth weight class and all calfs growth traits with the highest being with calfs birth weight. The interaction between season and sire birth weight class showed significant (p<0.05) effect on calfs pre-weaning and post weaning daily gain during the temperate season but none (p>0.05) for the other growth traits of birth weight, weaning weight and yearling weight. Heavier calfs sired by high sire birth class had a significant (p<0.05) longer dam gestation length than those of low class sire birth weights. There was a significant (p<0.05) correlation between sire birth weight class and gestation length of the dam. However, there was no significant (p>0.05) effect of calfs sex on the dams gestation length. Analysis showed that dams sired by high sire birth weight class had heavier calfs and this had a significant (p<0.05) effect on the dams calving ease of score in comparison to dams sired by medium and low sire birth classes.