The aim of present work was to define the influence of the effort, in different phases of the training, on chosen haematologic indicators and the antioxidative status of blood in horses used recreationally and sportingly. Obtained results indicate that the degree of training and the preparation of horses to the effort can be evaluated by means of chosen haematologic indicators in conjunction with the estimation of the efficiency of the antioxidative system in blood of horses. Parameters showing good preparation of the horse to the oxygenic work are the high rest and postconative number of erythrocytes and the quantity of contained in them hemoglobins and the low decrease of value of the entire reductive potential of blood. The individual character of obtained values indicates that only yearly examinations and the settlement of the individual metabolic profile of the horse will let on the precise definition of progresses in the training and the adequate reaction of the organism of the horse on the effort.

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