Abstract: The purpose of this study was to determine the level of growth characteristics and to investigate the effects of environmental factors on these characteristics in purebred Arabian foals reared at Anadolu state farm. The study was carried out on the date obtained from 1681 foals at birth, 268 foals at 6 month, 422 foals at one years of age, 160 foals at 2 years of age and 37 foals at 3 years of age between the years 1987 and 2007. Although, the effect of foaling month was insignificant (p>0.05), the effects of foaling age, foaling year and sex of foals on birth weight were significant (p<0.001-p<0.05). Colts weighed 46.27±0.40 kg at birth, while fillies weighted 45.22±0.40 kg at birth. Means of body weights at birth was 45.74±0.31 kg. The average values for withers height of colts and fillies at birth, 6 month, 1, 2 and 3 years of age were 96.66±0.08, 136.29±0.34, 142.18±0.42, 149.80±0.37 and 151.79±0.78 cm, respectively. Average values heart girth were 80.06±0.08, 148.16±0.48, 156.70±0.36, 170.96±0.54 and 175.33±0.99 cm, respectively. The average values for body length foals at birth, 6th month, 1, 2 and 3 years of age were, respectively 69.03±0.23, 122.01±0.39, 132.08±0.86, 142.04±0.46, 145.08±1.00. Averages values for cannon bone circumference were10.63±0.10, 16.64±0.07, 17.73±0.04, 18.82±0.08, 19.32±0.11, respectively. At the end this study, it was concluded that growth performance of purebred Arabian horses reared at Anadolu state farm were good. Mean values of body measurement at some periods (birth, 6 month, 1, 2 and 3 year) can be used to control growth of foals in this farm and growth performance of foals was evaluated according to these values.