Effects of Dietary Fiber Level on Growth Performance,Serum Biochemistry,Immune Organs and Small Intestine Development of Broilers
The experiment was conducted to investigate the effect of dietary fiber(a mixture of dried corn distillers'grains,rice bran and wheat bran at equal proportion)on growth performance,serum biochemi-cal indicators,immunity organ index and small intestine development of broilers.A total of 480 one-day-old ROSS 308 broilers were randomly divided into 4 groups.Broilers in the control group were fed the basal diet,and those in the other 3 groups were fed the basal diet supplemented with dietary fiber by 3.0%,4.5%and 6.0%respectively for 42 days.The results were as follows.1)Compared to the control group,dietary fiber sup-plementation decreased body weight,average daily gain and average daily feed intake of broilers at 1～21 days of age(P<0.05),but 6.0%dietary fiber group increased body weight at 42-day age and average daily gain at 22～42-day age,and decreased the ratio of feed to gain at 1～42-day age(P<0.05).2)All dietary fiber groups increased serum albumin level(P<0.05),and compared to the control,both 3.0%and 6.0%dietary fiber groups increased serum triglyceride and total protein levels at 21-day age,which were decreased at 42-day age(P<0.05).3)The 4.5%dietary fiber group increased spleen index at 21-day age(P<0.05)com-pared with the other groups,and 6.0%dietary fiber group decreased bursa of fabricius index at 42-day age(P<0.05)compared with the control and the 4.5%dietary fiber group.4)The 3.0%dietary fiber group de-creased the ratio of villus height to crypt depth in ileum at 21-day age and crypt depth in duodenum at 42-day age(P<0.05),and increased the duodenum ratio of villus height to crypt depth at 42-day age(P<0.05);the 6.0%dietary fiber group increased jejunum villus height at 21-day age and 42-day age,and ileum villus height at 21-day age(P<0.05);the 4.5%dietary fiber group decreased jejunum crypt depth at 21-day age.In con-clusion,dietary supplemented with 6.0%dietary fiber could improve production performance,reduce serum cholesterol and triglyceride levels,and promote small intestine development of broilers.
BroilersFiber levelGrowth performanceSerum biochemistryImmune organsIntestinal development
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维普
