EN
The study aimed at making a thorough investigation of the influence of magnesium on the absorption of vitamin C and, conversely, the influence of ascorbic acid on the absorption of magnesium from the alimentary tracts of hens. The influence of magnesium on the absorption of vitamin C and conversely influence of ascorbic acid on the absorption of magnesium by the method of perfused intestinal loop „in vivo” according to Mykkanen and Nys. Magnesium radically increased the absorption of ascorbic acid from the jejunum and caecum of chickens. The inversely proportional dependence between the concentration of magnesium in the solution and the amount of vitamin C absorbed has been proved. A substantial increase of absorption of vitamin C in the jejunum from 2,60 mg/l/cm²/60 min to 3.83 mg/l/cm²/60 min and in the caecum 4.10 mg/l/cm²/60 min to 3.83 mg/l/cm²/60 min and in the caecum from 4.10 mg/l/cm²/60 min to 5.15 mg/l/cm²/60 min was determined. Ascorbic acid, however, decreased the absorption of magnesium. Vitamin C decreased the absorption of magnesium in the jejunum from 1.83 mg/l/cm²/60 min to 1.17 mg/l/cm²/60 min and in the caecum from 3.63 mg/l/cm²/60 min to 2.21 mg/l/cm²/60 min. Ascorbic acid in perfused fluid was marked by Roe-Kuether method. In time, along with the flow of perfused fluid the conditions for absorption changed.; pH increased and amount of vitamin C and magnesium absorbed by intestine decreased. This phenomenon is caused by a natural process connected with the saturation of the intestine wall with the vitamin concentrated during the earlier intense absorption, the increased level of ascorbic acid in the blood, as well as the loss of energetic substances and the secretion of enzymes, electrolytes and mucin in to intestinal lumen. The results obtained in the paper may by used in feeding, prophylaxis and treatment of domestic animals and people.