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The experiment aimed to investigate the impact of substituting corn with fermented sweet potato potato on the growth performance, serum biochemical indexes, immune indexes, and intestinal morphology of yellow-feathered broilers. A total of 360 one-day-old yellow-feathered broilers were randomly divided into four groups, with six replicates in each group, and 15 broilers in each replicate. The broilers in control group were fed a basal diet. Groups I, II, and III were fed diets with 1%, 3%, and 5% fermented sweet potato pomace substituting corn, respectively, from 1 to 21 days of age, and 5%, 8%, and 10% from 22 to 42 days and 43 to 70 days of age, respectively. The trial lasted for 70 days. The results showed that substituting corn with fermented sweet potato pomace did not significantly affect the average daily weight gain, average daily feed intake, and feed conversion ratio of the yellow-feathered broilers (P>0.05). Compared to the control group, the levels of serum high-density lipoprotein cholesterol (HDL-C), immunoglobulin A (IgA), immunoglobulin G (IgG), interleukin-2 (IL-2), and interleukin-6 (IL-6) in groups I and II were significantly increased (P<0.05). At 21 days of age, the villus height and crypt depth of the duodenum in group I were significantly reduced (P<0.05), while the crypt depth in the ileum was significantly increased (P<0.05), and the villus height to crypt depth ratio (V/C) in the ileum of groups I and III were significantly decreased (P<0.05). At 42 days of age, the villus height of the duodenum and jejunum and crypt depth of the jejunum in group III were significantly reduced (P<0.05), the V/C of the duodenum in group I was significantly increased (P<0.05), and the villus height of the ileum in groups I and II were significantly increased (P<0.05). At 70 days of age, the villus height and V/C of the duodenum in groups I and II were significantly increased (P<0.05), the crypt depth was significantly reduced (P<0.05), and the villus height and V/C of the jejunum in group II were significantly increased (P<0.05). The study indicates that adding fermented sweet potato pomace to the diet as a substitute for corn can improve the serum immune indicators and intestinal tissue morphology of yellow-feathered broilers, and the optimal supplemental level is 5% at 1 to 21 days of age and 8% at 22 to 70 days of age. [ABSTRACT FROM AUTHOR]

The experiment was conducted to explore the effect of the metabolites of Lactobacillus plantarum on the growth performance and intestinal health of Yellow-feathered broilers. A total of 828 one-day-old Yellow-feathered broilers were randomly divided into two groups, with six replicates in each group and sixty-nine broilers in each replicate. The broilers in the control group were fed with basal diet, and the experimental group added 300 mg/kg the metabolites of Lactobacillus plantarum into the basal diet. The experiment lasted for 63 days. The results showed that compared to the control group, F/G of Yellow-feathered broilers in 1-21 days of the experimental group was decreased by 1.8% (P<0.05), the gene expression of TNF-α, IL-1β, and IL-6 of jejunum were decreased by 50.5%, 72.6%, and 23.1%, respectively (P<0.05), and the score of dung morphology was decreased by 40.3% (P<0.05). The ADG of Yellow-feathered broilers in 22-63 days, the VH in jejunum and ileum, the VH/CD in ileum, and the microbial community abundance of Butyrate-producing bacteria in the experimental group were increased. The study indicates that the metabolites of Lactobacillus plantarum combined with the basal diet can improve the growth performance and intestinal health, and then improve the economic benefit. [ABSTRACT FROM AUTHOR]

The experiment was to investigate the effect of puerarin on ileal microflora of broilers fed oxidized soybean oil. A total of 360 one-day-old healthy female Yellow-feathered broilers were randomly divided into four groups, fresh soybean oil group, soybean oil + puerarin (750 mg/kg) group, oxidized soybean oil group and oxidized soybean oil + puerarin (750 mg/kg) group, respectively, with six replicates in each group and 15 broilers in each replicate. The experiment lasted for 56 d. The results showed that compared with fresh soybean oil group, Shannon indexes was significantly increased on ileal microflora of 56-day-old broilers in oxidized soybean oil group (P<0.05), Sobs indexes on ileal microflora of 28-day-old broilers was reduced. There was a significant interaction between oxidized soybean oil + puerarin group on Sobs indexes and Chao1 indexes of ileal microflora of 56-day-old broilers (P<0.05). Compared with oxidized soybean oil group, Sobs indexes and Chaol indexes were significantly decreased of on ileal microflora of 56-day-old broilers in oxidized soybean oil + puerarin group (P<0.05). Compared with fresh soybean oil group, the abundance of Bacteroidetes, Synergistetes and Ruminococcaceae_UCG-014 on ileal microflora of 56-day-old broilers in oxidized soybean oil group were increased. The experiment indicates that puerarin can reduce number of specific OTUs on ileal microflora of broilers fed with oxidized soybean oil, alleviate imbalance of intestinal microbiota caused by feeding oxidized soybean oil. [ABSTRACT FROM AUTHOR]