Development of the normal gastrointestinal microflora of specific pathogen-free chickens

摘要: The development of the normal intestinal microflora small intestine, caecum and large intestine specific pathogen-free (SPF) chickens, was studied in period from hatching to 84 days age. No bacteria were detected any sites at hatchery (day 1), but by day 3 significant levels faecal streptococci coliforms isolated all sites. flora limited for first 40 then lactobacilli became established dominated flora. A variety facultative strictly anaerobic organisms colonized caecum. Many these species transient only present a period; after stabilized consist predominantly streptococci, Escherichia coli, Bacteroides spp. Lactobacillus sp. composed also or These findings differ previously published studies on conventionally reared chickens that number population are much lower. This probably reflects absence continuous environmental challenge because housing feeding facilities which maintained.