Ways of Reducing Salmonella in Broiler Chickens21 March 2014
Research from Brazil shows that bacteriophage therapy of broilers can reduce Salmonella contamination of their carcases by lowering the number of bacteria in the live birds.
As Guilherme Augusto Marietto Gonçalves and colleagues at Brazil's São Paulo State University explain in their paper in Poultry Science, Salmonella food poisoning is a public health problem.
Feed withdrawal from broiler chickens before slaughter can favour the multiplication of Salmonella in the caecum and crop of contaminated animals and subsequently lead to contamination of carcases in the processing plant.
In their latest study, a cocktail of lytic bacteriophages isolated from sewage water was orally administered to 45-day-old broiler chickens one hour after they received an oral dose of 107 colony-forming units (cfu) per ml of Salmonella enterica subspecies enterica serotype Enteritidis.
Immediately after phage administration and 30 minutes, one, three, six and 12 hours thereafter, groups of chicken were killed. Caeca and crops were analysed for the presence of Salmonella.
Three hours post-treatment, there were 103cfu per gramme and 101cfu per gramme of caecal and crop suspension, respectively.
Six hours after treatment, the number of Salmonella was 103cfu per gramme in the caecal suspension but below the detection limit in the crops.
The São Paulo-based group report their results suggest that bacteriophage therapy may be able to reduce the contamination of chicken carcases by reducing the pre-slaughter load of Salmonella in the birds.
Gonçalves G.A.M., T.C. Donato, A.A.S. Baptista, I.M. de Oliveira Corrêa, K.C.O.D. Garcia and R.L.A. Filho. 2014. Bacteriophage-induced reduction in Salmonella Enteritidis counts in the crop of broiler chickens undergoing preslaughter feed withdrawal. Poultry Science. 93(1): 216-220. doi: 10.3382/ps.2013-03360
You can view the full report by clicking here.