The effect of beef from different fattening systems and of meat of marine fi shes, as being employed and the sole protein and fat source in rats' diets on the selected parameters of their growth and health state was examined. The rats of the experimental groups received meat-free diet (group I - control); groups II-IV - diets with 20% of meat: in group II - meat of marine fishes, in group III - beef coming from the animals extensively fed the pasture forage and in group IV - beef from the animals intensively fed the maize silage and concentrates. The body gains of the rats and feed utilization conversion per body weight gain were studied. In blood, the selected morphological and biochemical parameters were determined. The weight of the collected (after killing) internal organs: liver, heart, kidneys and spleen and their percentage participation in body weight were determined. In case of the rats fed the beef-containing diet (groups II, IV), significantly higher body weight gains and lower consumption of diet for 1 g of the gain was recorded as compared to the groups fed the meat-free diet and diet with the participation of fi sh. In the blood of the rats, receiving beef in their diet, significantly higher level of erythrocytes was found, as well. The remaining examined parameters in all groups were found on a similar level.
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