Bu çalışma, Sultansuyu Tarım İşletmesi koşullarında yetiştirilen safkan Arap atları ve tayların 1990- 1995 yıllarına ait bazı verim özellikleri düzeylerinin saptanması amacıyla yapılmıştır. Aygır altı kısrak sayışma göre östrııs, gebelik, kısırlık, doğum ve yavru atma oranları sırasıyla, % 95.10, 69.23, 30.77, 67.37 ve 1.86 bulunmuştur. Gebelik başına siklus ve tohumlama sayıları sırasıyla 1.24 ve 3.41 saptanmıştır. Düzeltilmiş gebelik süresi 333.8 gfin saptanmış, gebelik süresine yılların etkisi önemli (P

The current study was undertaken to investigate some production traits of purebred Arabian Horses and their foals being bred in Sultansuyu Stale Farm between J 990-1995. Ratios of oestrus,pregnancy, sterility, parturition and abortion were found to be 95.10 %, 69.23 %, 30.77 %, 67.37 % and 1.86 % respectively. Number of oestrus cycle and insemination per pregnancy were 1.24 ± 0.03 and 3.41 ±0.11 respectively. Adjusted gestation length was 333.8 ± 0.04 days. Effect of years on the gestation length was found to be statistically significant (p < 0.05). However, effect of age was insignificant. Viability of foals ageing 3, 6 and 12 months were determined as 91.7 %, 90.7 % and 89.7 % respectively. Viability of male foals from birth until 12 months of age 88.3 %, whereas those of females was 90.9%. Height at withers, circumference of front shank, chest girth, chest width, body length and height at rump of mares ageing 12-60 months were found as 151.0 ± 0.55 cm, 19.2 ± 0.08 cm, 165.2 ± 0.62 cm., 37.2 ± 0.16 cm., 139.2 ± 0.81 cm. and 142.3 ± 0.23 cm respectively. The differences among age groups were determined as statistically significant (P < 0.05 - P < 0.00If After measuring the height at withers, circumference of front shank, chest girth, chest width, body length and height at rump of male and female foals ageing 12-24 months and 24-36 months, it was found that males generally have greater body measures than females (P < 0.05 - P < 0.001).