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 α-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 α-amylase in both groups decreased after infection with more than 100 invasive eggs of A. galli. The intensity and the extensity of invasion were lower in the chickens given the diet of 19% of protein.
The assays were performed on 40 piglets divided into 10 equal groups. Half of the group received food with exogenous HCl. The rest of the animals served as a control. Piglets were gross anatomically examined at the age of 28, 35, 49 and 56 days of life. The content of vitamin C was determined by the method of Roe et al., (Glick, 4) and riboflavin by the method of Bessey et al. (2). Age and addition of HC1 into food did not affect the level of vitamin C in the liver of piglets. However, the content of riboflavin in the livers of piglets receiving HCl at the age of 49 and 52 days was higher comparing to control animals.
The study was carried out on Astra S chickens which were grown on diets containing 11% and 19% proteins. In homogenized pancreas and duodenal contents from control animals and chickens infected with 500 invasive eggs of Ascaridia galli activities of alpha-amylase (FENNEL method), lipase (CHERRY-CRANDALL method) and trypsin (ANSON method) were determined. After 7 weeks of the invasion the activities of these enzymes were higher in duodenal contents and lower in pancreas of infected birds in comparison with the control animals. The differences were significant for alpha-amylase and lipase activities in animals which were given 11% protein diet, and for trypsin activity of chickens groups fed with 19% protein diet.
A group of 10-day-old chickens was experimentally infected with a dose of 500 infective eggs of Ascaridia galli (Schrank, 1788) (Nematoda). Forty-nine days post infection the chickens were necropsied and the infection intensily and prevalence were determined. The group maintained on the feed containing 11% of protein showed higher infection intensity and prevalence compared to the chickens fed a diet containing 19% of protein. The addition of vitamin B₂ to the feed containing 11% protein resulted in lower intensity and prevalence of the infection. In both series of experiments no effect of Zn-bacitracin or vitamin B₂ on infection intensity or prevalence was observed for chickens fed feed containing 19% of protein.
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.