Effect of dietary probiotics, prebiotics and synbiotics on growth performance, blood characteristics and gut microflora of broilers

• Main Author: 張雲喬
• Other Authors: 謝豪晃
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/15276783008045908926

碩士 === 國立屏東科技大學 === 畜產系 === 90 === Two experiments were conducted to determine the effects of dietary probiotics, prebiotics and synbiotics on the growth performance, serum cholesterol, triglyceride, high density lipoprotein, immunoglobulin and gut microflora of broilers. Two hundred and forty day-old commercial broiler chicks in each experiment were randomly divided into 12 pens with 20 chicks in each pen. The experimental period was six weeks. Feed and water were provided ad libitum. There were four dietary treatments in Exp. 1, which consist of the basal diet (control), basal diet supplemented with either probiotics (Acid-Pak 4-Way®), prebiotics (Bio-Mos®) and synbiotics (Acid-Pak 4-Way® and Bio-Mos®). In Exp. 2 there were also four dietary treatments which consist of the basal diet (control), basal diet supplemented with either probiotics (All-Lac®), prebiotics (Bio-Mos®) and synbiotics (All-Lac®and Bio-Mos®). At 21 and 42d of age, the data from each experiment of growth performance, serum cholesterol, triglyceride, high density lipoprotein, immunoglobulin and gut microflora were collected for analysis and determination. The results showed: 1. In experiment 1, there were no significant differences among probiotics, prebiotics and synbiotics groups. Howere, body weight gain from 4 to 6 wks of age of chickens fed synbiotics was significantly lower (P＜0.05) than other groups. In experiment 2, body weight gain from 1 to 3 wks of age of chickens fed probiotics and synbiotics weres significantly lower (P＜0.05) than those of the control birds. There were no significant differences in body weight gain and feed:gain from 1-6 wks of age between treatment groups. 2. In Exp. 1, the serum triglyceride levels were significantly higher (P＜0.05) for broilers fed diet containing probiotics than the control group. There were no significantly differences in serum cholesterol levels among all treatment groups. In Exp. 2, there were also no significant differences in the serum cholesterol , triglyceride and high density lipoprotein between treatment groups throughout the experimental period of 1 to 6 wks of age. 3. There were no significant differences in the blood immunoglobulin between treatment groups throughout the experimental period of 1 to 6 wks of age. 4. In Exp. 1, coliforms counts in duodenum and caecum of birds receiving synbiotics at 6 wks of age were significantly lower (P＜0.05) than those of control birds. Coliforms counts in caecum of birds receiving prebiotics at 6 wks of age was significantly lower (P＜0.05) than those of control birds. In Exp. 2, at 3 wks of age, coliforms counts in ileum of birds receiving prebiotics and synbiotics were significantly decreased (P＜0.05) than those of control birds. Coliforms counts in caecum were also significantly lower (P＜0.05) in broilers fed probiotics. At 6 wks of age, coliforms counts in caecum were significantly lower (P＜0.05) in broilers fed prebiotics, and no significant difference in ileum coliforms counts among all treatment groups was found. However , the broilers fed with probiotics, prebiotics and synbiotics did not significantly increase the lactobacilli population in the ileum, caecum and fecal.