Over recent years in many countries the research on how to use various additives to foodstuff in feeds of birds has intensified (ferment preparations, organic acids, prebiotics), due to which biological value as well as birds’ productivity and immunity to a contraction of diseases would increase. The aim of this experiment was to evaluate the effect of enzymes Rovabio™ Excel AP, organic acids Euro Guard SVB and prebiotics Agrimoss® on productivity and digestive processes of broiler chickens. To reach this, the dynamics of mass growth of chicken broilers, feed input, and birds’ preservation. The influence of preparations Rovabio™ Excel AP, Euro Guard SVB and Agrimoss® on biochemical and microbiological processes in the contents of separate intestinal segments of chicken broilers, as well as the influence of said preparations on blood parameters of broilers in blood serum was determined. The work was completed on April-September of 2006 in „AB Vilniaus paukštynas“, in the laboratory of birds’ feed and aviculture products at LVA (Lithuanian Veterinary Ascademy) and in the company „Adisseo“. The feeding trial was conducted on 800 Roos 308 broiler chickens allocated to four groups of 200 chickens each. Group I were control, groups II, III, IV were experimental. During all trial Rovabio™ Excel AP alone and in combination with Euro Guard SVB improved body weight 2% and Rovabio™ Excel AP + Agrimoss® improved broiler chickens body weight 4%, feed conversion ratio decreased 6%... [to full text]