Foram utilizados 1280 frangos de corte com o objetivo de se avaliar o uso de leveduras em substituição aos antibióticos empregados como controladores da flora microbiana e, como promotores de crescimento. Foi usada uma dieta a base de milho, farelo de soja e farinha de carne, fornecida à vontade. O delineamento experimental foi inteiramente casualizado em arranjo fatorial 4 x 2 (níveis de adição de leveduras: 0; 0,15; 0,45 e 0,60%) com e sem antibióticos. Os resultados demonstraram que as leveduras podem substituir os antibióticos testados na ração de frangos de corte, com eficiência semelhante à dos antibióticos, em relação ao ganho de peso, consumo de ração, conversão alimentar e índice de eficiência produtivo. Abstract A total of 1280 broilers were used in the present experiment, with the objective to study the possibility of using yeast as substitute of antibiotics, in order to control intestinal microorganisms and as growth promoter. A ration containing corn, soybean and meat floor was freely supplied to the broilers. The experiment was delineated as completely casual in a factorial arrangement of 4 X 2 (levels of yeast addition: 0, 0.15, 0.45 and 0.60 %) with and without antibiotics. The results showed that yeast could substitute antibiotics used in broilers ration at a level of efficiency identical to that of the antibiotics in terms of weight gain, food consumption, food conversion and productive efficiency index.
A total of 1600 broilers were used in the present experiment, with the objective to study the possibility to use yeast from sugar cane fermentation (Sacharomyces cerevisae) as substitute for antibiotics, in order to control intestinal microorganisms and consequently, like growth promoter. Ration containing corn, soy bran, meat floor, was freely supplied. The experimental design used was completely random with 20 treatments, 2 replications each. The treatments represent the factorial arrangement of 4 levels of yeast addition (0,15; 0,30; 0,45 and 0,60%) with and without antibiotics, one treatment with no yeast and no antibiotics and one treatment with just antibiotics. The feed program used was: starting chicken ration until 21 age days, growing chicken ration between 22 to 42 age days and finishing chicken ration between 43 to 48 age days. The results showed that the yeast can substitute the antibiotics used in the broilers ration, displaying a level of efficiency similar to that of e the antibiotics in terms of weight gain, feed conversion and efficient feed index.
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