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Not AvailableAn experiment was conducted to study the effects of water-soluble carbohydrate extracts from Cabbage tree ( Cordyline australis), Acacia ( Acacia pycnantha), and Undaria seaweed ( Undaria pinnatifida) (at 5 or 10 g/kg diet) on the performance and gut microbiota of broilers. The plant extracts had no negative effect on growth performance, except that a high level of Undaria extract in the diet suppressed the growth of broiler chicks. Ileal digesta viscosity was increased ( P<0.05) and apparent ileal digestibility of fat was depressed ( P<0.05) in birds fed the higher level of Undaria extract compared with the negative control. The plant extracts increased ( P<0.05) the numbers of lactobacilli in the ileum and caeca. The high levels of Acacia extract and Undaria extract significantly ( P<0.05) reduced the population of coliform bacteria in the ileum compared with the negative control group. The population of Clostridium perfringens in caeca, but not the ileum, was reduced ( P<0.05) by the plant extracts. An antibiotic positive control reduced the population of C. perfringens in both the ileum and caeca compared with the negative control group. The plant extracts altered microbial fermentation patterns in the ileum and caeca. The higher level of Undaria extract reduced villus height in the ileum while the antibiotic diet resulted in higher ( P