Aditivos alternativos aos antibióticos promotores de crescimento no desempenho de frangos de corte sob desafio sanitário

• Ano de defesa: 2015
• Autor(a) principal: Soares, Letícia [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Frango de corte; Ácidos orgânicos; Clostridium perfringens; Morfometria; Probióticos; Saccharomyces cerevisiae; Probiotics
• Link de acesso: http://hdl.handle.net/11449/126470; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/11-08-2015/000843074.pdf

The aim of this study was evaluate the use of alternative additives to antibiotic growth promoter on performance, intestinal morphometric and necrotic enteritis control of broilers, for this were realized two trials. In the first trial, were used 1,920 male Cobb 500® broilers, distributed into 8 treatments and 8 replicates in a completely randomized design, with 30 birds per pens. The treatments were: Positive Control (PC), with no additives in the diet and no sanitary challenge; Negative control (NC), with no additives in the diet but with sanitary challenge; NC + antibiotic; NC + prebiotic A; NC + antibiotic + prebiotic A; NC + probiotic; NC + organic acid; NC + prebiotic B. We evaluated body weight, body weight gain, feed intake, and feed conversion ratio, as well as the intestinal parameters villus height, crypt depth, villus:crypt ratio, and goblet cell count. No significant differences were found in animal performance between the tested treatments tested. No significant differences in the quality of the intestinal tract were seen. However, the number of goblet cells in the jejunum significantly increased in birds treated with prebiotic A and with antibiotic + prebiotic A. In the second trial, were used 1,360 male Cobb 500® broilers, distributed into 5 treatments and 8 replicates in a completely randomized design, with 34 birds per pens. The treatments were: Unchallenged, diet with no additives inclusion and no sanitary challenge; Challenged, diet with no additives inclusion but with sanitary challenge; Positive Control, diet with antibiotic (enramycin 10 ppm) and sanitary challenge; Challenged + Premium Lac AP; Challenged + Premium Lac BP. We evaluated body weight, body weight gain, feed intake, and feed conversion ratio, as well as intestinal lesion score caused by necrotic enteritis were evaluated. There was statistic difference in the period from 1 to 42 days only for feed intake. However, in the period from 22 to 35 days when ...