The influence of different feed additives to performances and immune response in broiler chicken

Our investigations were conducted in order to determine the influence of mannan-oligosaccharide (MOS) based prebiotics and polysaccharide microelement complexes on the performance and immune response of Arbor Acre broiler chickens. Total of 186 chickens was included in the study which lasted 42 days. Birds were fed ad libitum three different complete food mixtures (from days 1- 21, 21 - 35 and 35-42) according to the standard fattening procedure. Mixtures for chickens from the first group were supplemented with mannanoligosaccharide based prebiotics and for the birds from the second group with polysaccharide microelement (Fe, Cu, ZN and Mn) complexes. Broilers in the control group had daily weight gain of 49.1 g, daily food consumption of 115.5 g and a feed : gain ratio 2.35. In the group of broilers feed mixtures supplemented with mannan-oligosaccharides, the daily weight gain was higher (+ 14.95%), daily food consumption was lower (- 2.67) and feed : gain ratio was smaller (-15.32%) when compared to the control group. In the group of broilers fed mixtures with polysaccharide microelement complexes, the daily weight gain was also higher (+ 11.43%), daily food consumption was lower (- 4.28) and feed: gain ratio was smaller (-14.0%) when compared to the control group. Following revaccination against NCD, broilers fed MOS based prebiotics had significantly higher titers of antibodies than observed in the other two groups. The highest degree of cutaneous hypersensitivity to PHA was recorded in the group of broilers fed mixtures with polysaccharide microelement complexes.