Utilização de ácido butírico encapsulado no controle de Salmnoella enterica sorovar enteritidis em frangos de corte experimental inoculados
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2014-02-25
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Universidade Federal de Goiás
Resumo
The present study aimed to evaluate the encapsulated butyric acid in the control
of Salmonella enterica serovar Enteritidis, performance and systemic health of
broiler chickens experimentally inoculated. 576 one-day-old male chicks were
distributed in a completely randomized design with eight treatments and six
replications each. The poultries were inoculated orally at one-day-old with 0.3
ml of phosphate buffered saline, containing approximately 2.0 x 10
6
CFU/ml of
Salmonella enterica serovar Enteritidis. Treatment 1 (T1) was the control group
(Placebo); T2 - received butyric acid at a dose of 0.03%; T3 - received butyric
acid at a dose of 0.075%; T4 - received the butyric acid at a dose of 0.15%; T5 -group inoculated orally (Positive Control SE); T6 - inoculated orally treated with
0.03%; T7 - inoculated orally treated with 0.075%; T8 - inoculated orally treated
with 0.15%. At 22 days of age, the chickens were reinfected with 0.5 ml of
phosphate buffered saline containing concentration greater than 1.0 x 10
9
CFU/ml of Salmonella. Butyric acid favored the performance up to 21 days. The
acid reduced the intestinal population E. coli. The intestinal pH did not differ by
butyric acid, however Salmonella caused a reduction. At 14 days, the
acidification effected the growth of the villi of the jejunum and Salmonella
caused a reduction in the villous and greater relation villi : crypt in the
duodenum and jejunum. No Salmonella was isolated from cloacal swabs
collected from poultries that received the dose of 0.03%. Salmonella reduced
intestinal weight. The colonization of Salmonella in organs at eight and 28 days
of age was reduced in the presence of acid. Liver weight was smaller in the
inoculated poultries and larger in the non-inoculated poultries and treated with
0.03% at 15 days. The spleen was smaller than in inoculated poultries which
received the dose of 0.03%, at eight days. Salmonella reduced the bursa weight
at 15 days.Dietary acidification reduced the lymphoid depletion in the inoculated
group. Salmonella influenced the antibody production against Newcastle
Disease and Salmonella enterica serovar Enteritidis. The dose of 0.15%
increased the antibody production against Newcastle Disease in the inoculated
groups and antibodies against Salmonella enterica serovar Enteritidis in the
non-inoculated group at 42 days. The mortality of poultries did not differ
between treatments. We conclude that, among the investigated dosages, the
inclusion of 0.03% yielded the best results in performance and beneficial effects
on intestinal health and organ biometrics. The dose of 0.15% improved humor
immunity of the poultries.
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ARAÚJO, Angélica Ribeiro. Utilização de ácido butírico encapsulado no controle de Salmnoella enterica sorovar enteritidis em frangos de corte experimental inoculados. 2014. 86 f. Dissertação (Mestrado em Ciência Animal) - Universidade Federal de Goiás, Goiânia, 2014.