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Prebiotics are natural or synthesized organic or inorganic substances that favor the development of useful microorganisms in the digestive tract. Prebiotics have only recently been used in aquaculture, for their bene icial effects on production performances and health status, as an alternative strategy for the use of antibiotics. Other members of the prebiotics group are: inulin, fructo-oligosaccharides (FOS), short-chain fructo-oligosaccharides (scFOS), mannan oligosaccharides (MOS), galacto-oligosaccharides (GOS), xylo-oligosaccharides (XOS), arabinoxylo-oligosaccharides (AXOS). Effects of prebiotics on growth, feed conversion, disease resistance and immune parameters in different species of ish, have been studied worldwide, but to a lesser extent compared to the land animals. From the previously listed prebiotics, the most ef icient in ish nutrition are the mannan oligosaccharides, extracted from the cell wall of Saccharomyces cerevisiae. An important product from this category is Bio-Mos and Actigen. This mannan based prebiotic inhibits the development of pathogenic bacteria in the gut, at the same time having immuno-stimulatory effects, thus determining a greater disease resistance. At an intestinal level, prebiotics determine the increase of the nutrient absorption area, leading to an increased growth rhythm and a better-feed conversion. Keywords: prebiotics, production and consumption indices, survival rateIntroduction. Prebiotics are substances of organic or inorganic origin, natural or synthesized that favor de development and multiplication of useful microorganisms in the intestinal tract, thus contributing to maintaining a good health status and the increase of the productive performances in animals and ishes. The effects of prebiotics on growth, feed conversion, disease resistance and immune parameters were studied worldwide, but to a lesser extent in ishes. As an alternative strategy to the use of antibiotics in aquaculture, the prebiotics only recently drew attention (Ringo et al., 2010). Other members of prebiotics with bene icial effects in ish are: inulin, fructo-oligosaccharides (FOS), short chained fructo-oligosaccharides (scFOS), mannanoligosaccharides (MOS), galacto-oligosaccharide (GOS), xylo-oligosaccharides (XOS) and arabinoxylo-oligosaccharides (AXOS).

The use of probiotics, as fodder supplement for chickens, could stimulate meat quality that is a very important criterion especially for human consumption markets. The study had in view the effects of YEA-SACC 1026 probiotic product on meat quality in chicken broilers. There were studied 75 meat chickens of Ross-308 hybrid grouped on three lots of 25 capita/lot during an experimental period of 42 days. In the mixed fodder of experimental lots was added YEA-SACC 1026 probiotic in proportion of 0.1% in lot L1(E) and in proportion of 0.25% in lot L2(E). In the experiment end were effected control slaughtering of 5 chickens per each lot, to establish the meat quality by trenching and meat chemical composition. After YEA-SACC 1026 probiotic administration, as fodder supplement, was improved the chicken meat quality by increasing the weight of superior quality meat in carcass. The obtained results confirm the favourable effects of probiotics on chicken meat production and its quality

The prebiotics are natural or synthetic organic substances that favour the growth of beneficial microorganisms in the gastro-intestinal tract, thus maintaining the animals healthy and productive and subsequently increasing the production performances. The aim of this study was to evaluate the effects of prebiotic products (Actigen and Biotronic Top3) on the main production and consumption indices of broilers. The study was conducted on a 75 broiler chicken Ross-308 hybrids divided in three groups, over a period of 42 days. Group 1(E) received combined feeds with the Actigen prebiotic for 42 days as follows: 0.08% in the starter phase (1-14 days), 0.04% in the grower phase (14-35 days) and 0.02% in the finishing phase (35-42 days). The broilers in group 2(E) were administered feeds containing prebiotic Biotronic Top3 (0.1%) for the whole duration of the study. The broilers in the control group were fed with the base feed only. The broilers from all groups were weighed at the beginning and every following week; their average body weight, daily weight gain, feed consumption and feed conversion ratio (FCR) were determined. The use of the Actigen in experimental group 1(E) led to a body mass increase of 11.26%, to an 11.54% higher daily weight gain and to the reduction of the FCR by 2.31% compared to the control group. In Group 2(E) receiving Biotronic Top3, an increase was recorded for the body mass (9.25%) and daily weight gain (9.49%), the FCR being the same as the one recorded in the control group. These results confirm the favourable influence of prebiotics on the production performances of broiler chickens.