EN
The influence of vit. B-compositum of the synthesis of ascorbic acid in chickens was determined. The chickens were divided into three groups: a) group 1 containing 10 animals served as the control, b) group II (10 chickens) was given vit. B-compositum intramuscularly once a day, c) group III (10 chickens) received vit. В orally for two weeks as well. The level of ascorbic acid was determined post mortem using Roe-Kuenther’s method; plasma, the wall of stomach, jejunum, caecum and liver were prepared acc. to Zannoni. An increase of vit. C was 55% in the wall of the stomach, 49% in the caecum, 30% in the jejunum and 25% in the liver. The administration of vit. В per os did not influence ascorbic acid synthesis by the wall of the alimentary tract and liver. One may presume that the addition of vit. В to poultry fodder does not increase vit. C synthesis.