Controle de Salmonella Typhimurium em frangos de corte utilizando lactose
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2009-07-25
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Universidade Federal de Goiás
Resumo
This study was conducted at the Experimental Center of Poultry Diseases and Laboratory of Bacteriology Department of Veterinary Medicine Veterinary School, Federal University of Goias to evaluate the effects of lactulose in Salmonella typhimurium in broilers. The experimental design was completely randomized, evaluating substance applied (lactulose) and bacterial challenge. We used 630 chicks of commercial strain, which were distributed in six treatments with seven replicates and 15 birds per experimental unit. The microbial challenge was provided to birds in the first days of life containing 5.0 X 102 CFU / 0.5 mL of Salmonella typhimurium. And lactulose at a dose of 0.023 mL / g of body weight up to 14 days of age. The weights of the birds and feed intake were seen weekly for performance measurement. On days seven, 14, 21 and 28, one bird per treatment was necropsied, and liver collected for biometric analysis and histopathological. The contents of ingluvie and caeca were submitted to enumeration of Salmonella and Escherichia coli and bacterial analysis, as well as the spleen, liver and heart were examined bacteriologically. Was also measured the pH of ingluvie, small intestine and cecum and blood collected for evaluation of liver enzymes. The quantitative performance data, biometrics liver, pH, bacterial count and liver enzymes were analyzed by applying ANOVA and Tukey (5%), and data resulting from analysis of fecal excretion of Salmonella were analyzed using the nonparametric chi-square . There was greater weight gain and lower feed conversion (P <0.05) in groups receiving lactulose with or without S. Typhimurium to 21 days of life and decreased fecal excretion of S. Typhimurium at 10 days of age for birds fed lactulose (P <0.05) from the first days of life. It was also found that the lactulose caused decrease in values (P <0.05) pH in the organs of the digestive system for seven days of life and that lactulose decreased (P <0.05) the CFU of E. coli in ingluvie at 21 and 28 days and S. Typhimurium in the treatments administered lactulose before the pathogen and ages. Lactulose prevented infection in the early period of life for birds, showing a better effect when administered 48 hours before inoculation. It was also that there was an increase in relative liver weight by S. Typhimurium in all ages studied and that the lactulose caused mild liver abnormalities, and it was also found that the S. Typhimurium did not cause severe clinical signs or mortality and that its recovery rate decreased with age. It can be concluded that lactulose causes greater weight gain in birds until one week after delivery, as well, was able to decrease the fecal excretion of S. Typhimurium. It also appears that the lactulose changed the pH values, except pH and reduced cecal colonization of S. Typhimurium in the cecum and the number of CFU of E. coli in ingluvie. It is also concluded that lactulose was able to prevent systemic infection while being provided, showing better preventive effect, and also ordered discrete liver, a process similar to congestive
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SOUZA, Eliete Silva e. Control of Salmonella typhimurium in broilers using lactose. 2009. 88 f. Dissertação (Mestrado em Ciências Agrárias - Veterinaria) - Universidade Federal de Goiás, Goiânia, 2009.