Biological response of rat fed diets with high tuber content of conventionally bred and transgenic potato resistant to necrotic strain of potato virus (PVYN) Part I. Chemical composition of tubers and nutritional value of diets

Biological response of rat fed diets with high tuber content of conventionally bred and transgenic potato resistant to necrotic strain of potato virus (PVYN). Part II. Caecal metabolism, serum enzymes and indices of non-specific defence of rats

“…The results of this study partly confirmed differences in the nutritional value of diets containing tubers of cultivars Ania and Maryna that were previously reported in the growth experiment and nitrogen balance (Zdunczyk et al, 2004). The highest content of protein in the caecal digesta was found in rats fed a diet with potatoes of cultivar Maryna.…”

“…Some differences in the parameters of the caecum of rats fed diets with tubers of transgenic lines (e.g. differences in the caecum wall mass and dry matter content in the caecal digesta of rats fed tubers of transgenic lines R1F or R2P as well as a higher pH of the caecal digesta in the group fed tubers of transgenic line NRT1.16), are difficult to explain since differences in the chemical composition of potatoes were negligible (Zdunczyk et al, 2004). Perhaps autoclaving and drying of tubers differentiated the content of resistant starch in potato samples.…”

“…Chemical composition of potato, guidelines and results of growth experiment were presented in a separate paper (Zdunczyk et al, 2004). The content of the main nutrients of diet (protein, starch and dietary fibre), as well as short information on genetically transformed potato lines are presented in Table 1.…”

“…The applied genetic modification had no effect on the chemical composition (e.g. the content of protein, 0956 starch, dietary fibre) and nutritional properties of the diet (feed intake, animal growth, feed and protein utilisation) with a high content of autoclaved potato (Zdunczyk et al, 2004). Small variations were observed, which depended on the type of inserted viral sequence, viz.…”

Caecal fermentation in rats fed diets containing transgenic potato tubers

“…The results of our earlier studies indicate that genetically modified potato did not differentiate animal growth and feed utilization (Zduńczyk et al, 2004a) as well as serum enzymes and indices of non-specific defence of rats (Zduńczyk et al, 2004b), compared with non-transgenic tubers. The purpose of this study was to evaluate the potential influence of the transgenic potato on the fermentation processes in the caecum of rats.…”