Browsing by Subject "β-glukanaasi"

The aim of the study was to compare the effect of xylanase and β-glucanase enzymes on feed conversion ratio and growth compared to the control group. The Master's thesis also aimed to assess whether the amount of enzyme supplementation had an effect on feed conversion ratio or growth. The study was performed as a meta-analysis with 12 studies for xylanase and 13 studies for β-glucanase. The data collected included the amount of feed eaten, weight gain, the amount of enzyme supplementation and a negative control group. The data from the data set were compiled in a spreadsheet (Microsoft 365 Excel), after which the feed conversion ratio was calculated for each experimental group in the data set. The experimental groups were compared to the negative control group of the data by dividing the feed efficiency ratios of the experimental groups by the negative control group of the data and the results were tabulated in a separate table. The control group for the meta-analysis was set at 100 and the results from the data were compared to this value. The results were consistent with previous studies. Xylanase and β-glucanase enzyme supplementation had positive effects on feed conversion ratio and broiler growth. Meta-analysis showed that the optimal supplementation level for xylanase enzyme is slightly higher than for β-glucanase. On the other hand, there was some variation in the results between feed efficiency ratios, which may be explained by the main feed ingredients, environmental factors, or the breed of birds. Both xylanase and β-glucanase supplementation in feed improved feed utilization compared to the control group in the meta-analysis, which also supported the hypothesis of the study. So far, relatively little is known about the interactions between the different enzyme supplements and therefore more studies on the optimal level of enzyme supplementation should be conducted. However, the meta-analysis provided guidelines that the use of enzymes has positive effects on both animal welfare and feed efficiency. In conclusion, the use of enzymes in broiler feeding should be continued to improve bird performance, intestinal health, and feed efficiency.