Effects Of Galactooligosaccharides,Fructooligosaccharides And D-mannitol On Growth Performance,Intestinal Indice And Meat Quality In Broilers

The aim of this study was to investigate the effects of dietary supplementation of Galactooligosaccharides(GOS),Fructooligosaccharides(FOS)and D-mannitol(DM)on growth performance,intestinal indexes and meat quality of broilers.A total of 192(1 d of age)Arbor Acre broilers were used in the study.According to initial body weight,birds were randomly allotted to 4 treatment groups,6 replicates and 8 chickens per replicate(half male and half female).The control group were fed the basal diet,the three treatments were fed the experimental diets which added to 2000 mg/kg GOS,FOS and DM in the basal diet respectively.The experiment lasted for 42 days,and was divided into the early stage(1～21d)and the later stage(22～42d).The results are as following:1.The effects of GOS,FOS and DM on growth performance and the apparent metabolic rate of nutrients in broilers are shown as: compared with the CON group,the three groups had no significant effects on the ADG,BW and F:G(P>0.05).The ADFI in the FOS and DM groups in the early stage were very significantly lower than that in the CON and GOS group(P<0.01).Addition of GOS,FOS or DM very significantly increased the apparent metabolic rate of crude protein(P<0.01).2.The effect of GOS,FOS and DM on digestive enzyme activities and intestinal mucosa morphology in broilers are shown as: compared with the CON group,the DM group significantly increased amylase activity in the duodenum and ileum in the early stage(P<0.01),the FOS and GOS significantly improved the activity of amylase in duodenum while compared to the CON group in the whole stage(P<0.01).The three groups had a significant increase in the activity of chymotrypsin in duodenum than CON group in the early stage(P<0.01).In the early stage,compared with the CON group,dietary GOS was significantly(P<0.05)or very significantly(P<0.01)increased trypsin activity in duodenum and ileum.The dietary FOS and GOS significantly improved the activity of lipase in duodenum in the early stage(P<0.05).Compared with CON group,the VH of the duodenum in the early stage was significantly improved in GOS group(P<0.05),the VH and CD of the duodenum in the later stage were significantly improved in FOS group(P<0.01).The VH of the jejunum in the later stage were significantly improved in GOS and FOS groups,and the CD were significantly improved by FOS group(P<0.01).The VH at the ileum in early stage was significantly improved in FOS and DM groups(P<0.05).3.The effects of GOS,FOS and DM on slaughter trait and meat quality in broilers are shown as: the slaughter trait of the three treatment groups did not show a significant difference while compared to the CON group(P>0.05).The shear force of chest muscle in GOS group was significantly lower than that in the CON group(P=0.06).The FOS group had a decreaseing trend in the 48-h drip loss rate of leg muscle(P=0.08).In conclusion,dietary GOS,FOS or DM had different effects on the growth performance,intestinal indexes and meat quality in broilers.Overall,dietary FOS reduced ADFI and feed costs.Dietary GOS,FOS or DM improved digestive enzyme activities and intestinal mucosa morphology,But dietary FOS enhanced the digestive and absorptive capacity of the intestine.In addition,dietary GOS and FOS improved the muscle tenderness,and the FOS maintained more WHC of muscle.