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- W2315769794 abstract "Conventional commercial broiler production involves the rearing of more than 20,000 broilers in a single confined space for approximately 6.5 wk. This environment is known for harboring pathogens and antibiotic-resistant bacteria, but studies have focused on previously established houses with mature litter microbial populations. In the current study, a set of three naive houses were followed from inception through 11 broiler flocks and monitored for ambient climatic conditions, bacterial pathogens, and antibiotic resistance. Within the first 3 wk of the first flock cycle, 100% of litter samples were positive for Salmonella and Listeria, whereas Campylobacter was cultivation negative but PCR positive. Antibiotic resistance genes were ubiquitously distributed throughout the litter within the first flock, approaching 107 to 1012 genomic units g−1. Preflock litter levels were approximately 106 CFU g−1 for heterotrophic plate count bacteria, whereas midflock levels were >1011 colony forming units (CFU) g−1; other indicators demonstrated similar increases. The influence of intrahouse sample location was minor. In all likelihood, given that preflock levels were negative for pathogens and antibiotic resistance genes and 4 to 5 Log10 lower than flock levels for indicators, incoming birds most likely provided the colonizing microbiome, although other sources were not ruled out. Most bacterial groups experienced a cyclical pattern of litter contamination seen in other studies, whereas microbial stabilization required approximately four flocks. This study represents a first-of-its-kind view into the time required for bacterial pathogens and antibiotic resistance to colonize and establish in naive broiler houses. Core Ideas Colonizing pathogens and antibiotic resistance took <3 wk to establish. Full microbial colonization and stabilization took four flocks. Pathogens and antibiotic resistance were not found in surrounding environment before flock placement. Incoming birds may have provided the colonizing litter microbiome." @default.
- W2315769794 created "2016-06-24" @default.
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- W2315769794 date "2016-05-01" @default.
- W2315769794 modified "2023-09-27" @default.
- W2315769794 title "Cultivation and qPCR Detection of Pathogenic and Antibiotic-Resistant Bacterial Establishment in Naive Broiler Houses" @default.
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- W2315769794 doi "https://doi.org/10.2134/jeq2015.09.0492" @default.
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