Heat stress impairs performance and induces intestinal inflammation in broiler chickens infected with Salmonella Enteritidis
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
07/11/2013
07/11/2013
2012
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Resumo |
Stressful situations reduce the welfare, production indices and immune status of chickens. Salmonella spp. are a major zoonotic pathogens that annually cause over 1 billion infections worldwide. We therefore designed the current experiment to analyse the effects of 31 +/- 1 degrees C heat stress (HS) (from 35 to 41 days) on performance parameters, Salmonella invasion and small intestine integrity in broiler chickens infected with Salmonella Enteritidis. We observed that HS decreased body weight gain and feed intake. However, feed conversion was only increased when HS was combined with Salmonella Enteritidis infection. In addition, we observed an increase in serum corticosterone levels in all of the birds that were subjected to HS, showing a hypothalamus-pituitary-adrenal axis activation. Furthermore, mild acute multifocal lymphoplasmacytic enteritis, characterized by foci of heterophil infiltration in the duodenum, jejunum and ileum, was observed in the HS group. In contrast, similar but more evident enteritis was noted in the heat-stressed and Salmonella-infected group. In this group, moderate enteritis was observed in all parts of the small intestine. Lastly, we observed an increase in Salmonella counts in the spleens of the stressed and Salmonella-infected chickens. The combination of HS and Salmonella Enteritidis infection may therefore disrupt the intestinal barrier, which would allow pathogenic bacteria to migrate through the intestinal mucosa to the spleen and generate an inflammatory infiltrate in the gut, decreasing performance parameters. FAPESP Foundation [2009/51886-3, 2009/52487-5] CNPq [470776/2009-9, 300764/2010-3] |
Identificador |
AVIAN PATHOLOGY, ABINGDON, v. 41, n. 5, pp. 421-427, JAN, 2012 0307-9457 http://www.producao.usp.br/handle/BDPI/42874 10.1080/03079457.2012.709315 |
Idioma(s) |
eng |
Publicador |
TAYLOR & FRANCIS LTD ABINGDON |
Relação |
AVIAN PATHOLOGY |
Direitos |
restrictedAccess Copyright TAYLOR & FRANCIS LTD |
Palavras-Chave | #EHRLICH TUMOR-GROWTH #TIGHT JUNCTION PERMEABILITY #4 LAYER LINES #MACROPHAGE ACTIVITY #HYGIENIC STRESS #PRENATAL STRESS #IMMUNE-SYSTEM #IGA SYNTHESIS #BEHAVIOR #MICE #VETERINARY SCIENCES |
Tipo |
article original article publishedVersion |