Pathological conditions, which are the reason of indigestive and resorption in small intestine are linked with nutrition and are so-called malabsorptions. The reason of these conditions is on one hand decreasing of production abilities and on the other hand bad prosperity of farm husbandry eventually domestic animals. Malabsorptions are classified from pathological point of view to secondary and primary. To the first category belong the postsurgical state of digestive organs, malfunction of digestive organs from the various reasons such as decreasing of bile activity, decreasing of pancreas activity or for the reason of the malignant changes in the digestive organs or as the consequence of antibiotic treatment or cytostatics. The second category represents endogenous malfunction of intestine enzymes, which are linking with hypersensitivity to some kinds of feed. However the secondary malabsorptions are epiphenomenon several diseases, are in text also cure method mentioned, respectively mark of cure in some stadium diagnosed malabsorption. This present study is particulary oriented to pathogenesis and characterisation of the primary and secondary malabsorptions in the veterinary theory and praxis.