Abstract
Bacterial colonization of cecal mucosal epithelium in 3-day-old chicks administered a characterized continuous-flow (CF) culture of 29 microorganisms on the day of hatch was evaluated by scanning electron microscopy. Extensive colonization of the mucosa was noted in the ceca of CF-treated chicks, with large colonies of bacteria located predominately within and between crypts. Cecal crypts from control chicks contained only thin strands of mucus with a few bacteria. Individual cells and clumps of bacteria were observed bound to the mucosal epithelium in both CF-treated and control chicks. Colonization by CF culture bacteria was accompanied by an increase in the concentration of volatile fatty acids in the cecal contents and increased resistance to colonization by Salmonella typhimurium.
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