Bu araştırma, devlet haralarında yetiştirilmiş ve hipodrumlarda koşmuş olan Arap atlarının yarış performanslarının gelişimini yıllar üzerinden incelemek, yarış performansını etkileyen faktörleri ortaya koymak ve Arap atı yetiştiriciliğine ışık tutmak amacı ile yapılmıştır. Araştırmanın materyalini; Karacabey, Çifteler ve Sultansuyu haralarında yetiştirilmiş ve 1960- 1988 yılları arasında İstanbul, Ankara, İzmir ve Adana hipodrumlarında “Açık Koşu”larda koşmuş olan üç yaşlılar ile dört ve yukarı yaşlı “A Grubu” araplara ait değişik koşu mesafelerinde birinci olan atların yarış dereceleri teşkil etmiştir. Üç yaşlı araplar için 297, dört ve yukarı yaşlı araplar içinde 456 olmak üzere toplam 753 koşu neticesinden yararlanılmıştır. Değişik mevsimlerde ve pistlerde, koşulan her yarış mesafesinde gerek üç yaşlı ve gerekse dört ve yukarı yaşlı A grubu arap atlarının yılların ilerlemesi ile yarış performanslarının gelişim gösterdiğini ortaya koyan ve istatistiki yönde önemli çıkan korrelasyon katsayıları hesap edilmiştir. Üç yaşlı arap atlarının yarış performanslarını koşu pistinin çim ve kum olması etkilemiştir. 1200, 1400, 1600 ve 1800 metrelik yarış mesafelerinde çim ve kum pistlerde elde edilen yarış dereceleri arasındaki farklar istatistiki yönden önemli çıkmıştır (P

The anim of this study was to investigate the development of race performances of Arabian horses which were raised on state farms. The material used in this study were the winning scores of three year old Arabian horses which had in open-races in İstanbul, Ankara, İzmir and Adana between 1960 and 1988 and Arabian horses aged four or above (Group A) who were winner at different race lenghts. A total of 753 winning scores were used, 297 of these were for there year old Arabian horses and 456 for those aged four or above. Correlation coefficients were worked out which were found to be statistically significant for different seasons and racecourses, the race performances of both three and four year old Arabian horses and the older group A horses were found to develop as they became older. The racing performances of the three year old Arabian horses were found to be affected by the course was grass or sand. The differences between winning scores from grass and sand racecourses for 1200, 1400, 1600 and 1800 metres were found to be statistically significant. The racing performances of Arabian horses aged four and above were, apart from the 1400 and 1600 metre race distances found to be affected significantly by the race-course was grass or sand for the 1800, 2000, 2200 and 2400 metre races. The effect of seasons on the racing performances of three year old Arabian horses was not able to be determined, the differences between the averages of the winning scores obtained in the winterspring and summer-autumn seasons were not statistically significant. The racing performances of Arabian horses aged four and over, were found to be affected significantly by seasons. The differences between the winning scores of three year old. Arabian horses raised on the Çifteler, Karacabey and Sultansuyu state farms obtained on grass-courses were found to be statistically insignificant. The winning scores on sand race-courses were also found to be insignificant apart from in the 1400 metre races. The differences between the average winning scores of Arabian horses raised on the Çifteler, Karacabey and Sultansuyu state farms aged four and over, obtained on graas and sand race-courses were also found to be statistically in significant for the same race-lenght