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Background  Lighting is used during conventional broiler grow-out to modify bird behaviour to reach the goals of production and improve bird welfare. The protocols for lighting intensity vary. In a field study, we evaluated if the lighting practices impact the burden of  Salmonella  in broiler flocks.    Methods  Conventional grow-out flocks reared in the states of Alabama, Mississippi and Texas, USA in 2003 to 2006 were sampled 1 week before harvest ( n  = 58) and upon arrival for processing ( n  = 56) by collecting feathered carcass rinsate, crop and one cecum from each of 30 birds, and during processing by collecting rinsate of 30 carcasses at pre-chilling ( n  = 56) and post-chilling points ( n  = 54). Litter samples and drag swabs of litter were collected from the grow-out houses after bird harvest ( n  = 56). Lighting practices for these flocks were obtained with a questionnaire completed by the growers. Associations between the lighting practices and the burden of  Salmonella  in the flocks were tested while accounting for variation between the grow-out farms, their production complexes and companies.    Results  Longer relative duration of reduced lights during the grow-out period was associated with reduced detection of  Salmonella  on the exterior of birds 1 week before harvest and on the broiler carcasses at the post-chilling point of processing. In addition, starting reduced lights for ≥18 hours per day later in the grow-out period was associated with decreased detection of  Salmonella  on the exterior of broilers arriving for processing and in the post-harvest drag swabs of litter from the grow-out house.    Conclusions  The results of this field study show that lighting practices implemented during broiler rearing can impact the burden of  Salmonella  in the flock. The underlying mechanisms are likely to be interactive.

Lighting during grow-out and Salmonella in broiler flocks