Abstract
This study was conducted to evaluate the inclusion of two levels (2.5 e 5.0%) of dried yeast (Saccharomyces cerevisiae) and its by-products, disrupted yeast cells and yeast cell wall in diets for juveniles of pacu (Piaractus mesopotamicus). Production performance, body and plasmatic composition indexes were evaluated. Seven isoproteic (26% digestible protein) and isoenergetic (3.100 kcal digestible energy) diets were formulated containing increased levels of each ingredient. The diets were supplied for 86 days, "ad libitum". Yeast and by-products increase feed efficiency and protein use, when compared to the control diet. Carcass composition and plasmatic (glucose, cortisol, uric acid, urea and plasmatic protein) levels are not affected by the test ingredient supplementation.
Highlights
The intensification of the production process has triggered events which harm the balance among the factors that compose the production system, such as nutritional needs, infective/parasitological pathologies and the decrease of water quality, causing losses on the production
The yeast (Saccharomyces cerevisiae) included in the animal diet might be an alternative to the increase in the production efficiency, including aquiculture
The yeast is a source of nucleic acids (Rumsey et al, 1992), known for its property of interfering in the organism defense mechanisms of several aquatic species (Li & Gatlin III, 2003) and directly related to numerous physiological and genetic functions, working as mediators of energy metabolism (Li & Gatlin III, 2004)
Summary
The intensification of the production process has triggered events which harm the balance among the factors that compose the production system, such as nutritional needs, infective/parasitological pathologies and the decrease of water quality, causing losses on the production. The yeast (Saccharomyces cerevisiae) included in the animal diet might be an alternative to the increase in the production efficiency, including aquiculture. It is aimed the understanding of the mechanisms which include the action of components such as mannose polymers. The discussions on the use of this polysaccharide cover the dosing and the ministration period, besides explanations about the mechanisms and its function on animal physiology as an prophylactic agent and in the treatment of diseases caused by pathogenic elements of latent and/or sublethal action (Gannan, 2005). The immunostimulators represent an important and promising tool for aquiculture, as they increase productivity and improve animal resistance
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