[The influence of an infective dose and the duration of infection with Ascaridia galli on trypsin and alpha-amylase activity in the pancreas of chickens fed with diets of different protein levels].

The studies were carried out on the chickens given the diet containing 19% and 11% of protein. On the 7th day of their life one part of the chickens were infected with different doses (125-500) of invasive eggs of Ascaridia galli. The other part of the birds were infected with 500 eggs of A. galli and the invasion lasted from 5 to 49 days. In the extracts from pancreas the activities of trypsin and alpha-amylase were measured. No differences were observed between trypsin activity of control and infected chickens fed with diet containing 11% of protein. The activity of trypsin was lower in infected chickens fed with diet containing 19% of protein, when the invasion lasted over 15 days. The activity of alpha-amylase in both groups decreased after infection with more than 100 invasive eggs of A. galli. The intensity and the extensiveness of invasion were lower in the chickens given the diet of 19% of protein.