• Journal of Animal Science and Technology
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• v.50 no.5
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• pp.667-676
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• 2008

This experiment was conducted to investigate the effects of dietary supplementation of various Lactobacilli strains on growth performance, intestinal microflora, ileal villi development and ileal mucosal surface of broiler chickens. Six hundred 1-d-old male chicks(Avian) were randomly divided into five groups of four replicates, each replicates containing 30 birds and fed corn-soybean meal diets containing Latobaillus were isolated from cecum of chichens at 107cfu/g diet for five weeks. The treatments were control(antibiotics-free diet), Lactobacillus crispatus avibro1(LCB), Lactobacillus reuteri avibro2(LRB), Lactobacillus crispatus avihen1(LCH) or Lactobacillus vaginalis avihen2(LVH). The body weight gain in groups fed Lactobacillus significantly improved as compared to those of control(P<0.05). Feed intake was not statistically different among the groups. The number of Lactobacillus in ileum and cecum of chicks fed various Lactobacillus tended to be increased or significantly increased as compared to those of the control(P<0.05), but there was difference by age of chicks and species of Lactobacillus. The number of yeast was significantly increased in cecum and ileum at three weeks old chicks fed Lactobacilli compared with the control(P<0.05). The anaerobes’ number of ileum and cecum tended to increase or significantly increased in Lactobacillus treatments compared with the control(P<0.05). The ileal villi length extended greatly at three weeks of age in groups fed Lactobacillus compared with the control(P<0.05). The length of ileal villi in chicks fed Lactobacillus was continuously increased up to five weeks of age, but did not increased in the control(P<0.05). Lactobacillus was found on ileal mucosal surface. And ileal mucosal surface was maintained better with Latobacillus feeding. These results suggest the possibility that cecal Lactobacillus of chickens could be used as probiotics by improving the growth performance and promoting development of ileal villi in broiler chicks.

• Korean Journal of Poultry Science
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• v.34 no.1
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• pp.15-21
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• 2007

This study was conducted to evaluate the effects of dietary softwood by-products extract on growth performance, organ weight and intestinal microbes in organic broiler chicks. Five treatments were assigned to 200 broiler chicks with four replication, allocating 10 broiler chicks in each replication. Dietary treatments included control(Organic diet), +C(Organic diet + antibiotics), T1(Organic diet + softwood by-product powder 3.0%), T2(Organic diet + softwood by-product extract 0.05%) and T3(Organic diet + softwood by-product extract 0.1%). Body weight gain was higher in +C and T3 for overall period than control and T1. Feed efficiency of were slightly improved in +C and T3 groups compared with that of control and T1. The small intestine weight tended to be higher in control and +C, but it's length showed high in only T1 group. Gizzard weight was significantly higher in T2 compared with other treatments(P<0.05). In contrast, spleen weight was significantly lower in control group(P<0.05), whereas the weight of cecum and liver were not significantly different by dietary treatment. Intestinal microflora was significantly lower or/and seemed to be low in softwood by-products treatment groups than control. Digestibility of energy and protein were statistically lower in control and T1 than other treatments(P<0.05). The IgG concentration of birds fed antibiotics, softwood by-product extract was higher than control and T1, but was no significance. The results of this experiments indicated that softwood by-product extract would be possible to apply for the feed additive in organic broiler diets.