The aim of this study was the analysis of kidney factor index (KFI) in roebuck before period procreation. The samples were kidneys and antlers from roebuck hunting in may 2004 on the area of the Rudnik Forest District of the Lublin Regional Directorate of State Forests. After preparation the kidneys were weighting with and without around kidney fat with 1 g exactness. In the other site we were weighting the body roebucks without the had (with 1 kg exactness) and the antlers with cranium (with 1 kg exactness). On this results we calculated kidney factor index (KFI) and correlation between body weight and value KFI. Our investigation shows the connection between body mass and animal condition. The very interesting conclusion was not correlation between roebuck age and individual condition. The value of correlation coefficient between antlers weight and KFI shows that quality of the trophy (roebuck antlers) more depends from personal conditions than body weight.

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