The data on 110 Holstein Friesian × Deoni breds for a period of 15 years were considered for study. The data accumulated on two farms were evaluated for first service period (FSP), first lactation period (FLP), first dry period (FDP) and first intercalving period (FICP) and effect of farm, season and period on these traits was studied. The least squares means for FSP, FLP, FDP and FICP were 170.51 ± 101.00, 321.25 ± 39.56, 198.86 ± 120.41 and 524.96 ± 218.77 days, respectively. The effect of farm and season were significant on FLP and FDP whereas non-significant for FSP and FICP. The period effect was significant except for FLP.
