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Research Note: Application of an Escherichia coli spray challenge model for neonatal broiler chickens. | LitMetric

AI Article Synopsis

Article Abstract

Avian pathogenic Escherichia coli (E. coli) is an opportunistic pathogen often introduced to neonatal chicks during the hatching process. This commensal bacterium, particularly as a pioneer colonizer of the gastrointestinal tract, can have substantial implications in the rearing of poultry because of reduced flock performance. In order to mimic the effects of the natural bacterial bloom present during the hatch, a seeder challenge model was developed to expose neonatal chicks to virulent E. coli. On day 20 of embryogenesis, selected early hatched chicks (n = 18/hatcher) were briefly removed and sprayed challenged with saline (vehicle) or E. coli at 1 × 10 colony-forming unit (CFU)/chick (exp 1) and 2.5 × 10 CFU/chick (exp 2). These challenged chicks were returned to the hatcher to serve as seeders to transmit the pathogen to the indirect challenged or contact chicks (n = 195/hatcher). For two 7-d experiments, the efficacy of transmission was evaluated via enteric bacterial recovery, body weight gain (BWG), and mortality. For exp 1 and exp 2, significantly (P < 0.0001) more gram-negative bacteria were recovered from the seeder and contact gastrointestinal samples than the negative control samples on day of hatch. In addition, there was a reduction (P < 0.05) in 7-d BWG and significantly (P < 0.0001) higher mortality in the contact-challenged chicks than the negative control chicks in both exp 1 and exp 2. These data suggest that this challenge model could be used to evaluate different methods of controlling the bacterial bloom that occurs in the hatching environment.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7905460PMC
http://dx.doi.org/10.1016/j.psj.2021.01.011DOI Listing

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