| The experiment was conducted to examine the effects of Burdock fructo- oligosaccharide (BFOS) as an additive on performance, nutrient digestion and metabolism, blood biochemical index after it added to the sheep basal diet. This study includes three sections:In the first section,40 Small Tail Han sheep and Poll Dorset F2 Hybrids, 3~4-month-old male lamb with an initial weight of 32 kg were randomly divided into 4 groups,fed control diet or the control with3.2 or 6.4 g or 9.6g of FOS/d (ten sheep each group)for 54 d respectively following 10 days pretreatment. The results showed that there was no significant difference (P> 0.05) in Lamb on daily gain and feed/gain in the test period. However, sheep fed BFOS showed the tendency that the average daily gain increased while the feed/gain decreased, the average daily gain of groupâ…¢was 6.99% higher and feed/gain was 6.0% lower than that of the control group.In the second section, three sheep were selected from each group, which were put into the metabolic cages. After an adaptation period of 3 days, faeces and urine were collected during a 5-day collection period.The results showed that: the apparent fecal digestion of DM,OM,NDF,ADF,CP,Ca and P was improved (P>0.05).The apparent fecal digestion of DM, OM, CP, NDF, ADF and Ca of groupâ…¢are all maximum.The apparent digestion of DM, OM, CP, NDF, ADF and Ca in groupâ…¢was 3.56%,3.01%,4.0%,4.74%,5.8% and 27.02% higher than that of the control group, respectively. The apparent digestion of P in groupâ… was the highest , 19.23% higher than that of the control group. There was no significant difference on the apparent digestion of EE, groupâ…¡was the highest, which were 2.17% higher than that of the control group.For BFOS on nitrogen balance, there was no significant difference on nitrogen balance index (consumption of nitrogen, fecal nitrogen, urinary nitrogen, digestible nitrogen, nitrogen digestibility, nitrogen deposition, the total and net nitrogen ratio) fed with different of dietary (P> 0.05) in sheep. However, compared with the control group, the experimental group showed that the fecal nitrogen and urinary nitrogen excretion were decreased while the digestible nitrogen, nitrogen digestibility, deposition of nitrogen, total nitrogen and net nitrogen ratio were increased.For fecal nitrogen excretion, all experimental groups were lower than the control group, with the BFOS concentration increased, the fecal nitrogen excretion has an decreasing tendency. The fecal nitrogen discharged in groupâ…¢was the lowest, 7.17% lower than that of the control group; The urinary nitrogen discharged in groupâ…¡was the lowest, 10.85% lower than that of the control group; For digestible nitrogen, groupâ…¢was 4.18% higher than that of the control group; For nitrogen digestibility, the experimental groups were higher than that of the control group, groupâ…¢was 4.05% higher than that of the control group; For deposition of nitrogen , groupâ…¢was 18.21% higher than that of the control group; For total nitrogen utilization, groupâ…¢was 17.94% higher than that of the control group; For net nitrogen utilization , groupâ…¡was the highest, 14.34% higher than that of the control group.In the third section, at the last day of the trial, four sheep in each group were randomly selected, jugular vein blood, separate plasma and serum. Plasma was used to determine the plasma urea nitrogen, blood glucose and total cholesterol; serum was used to determine the immunoglobulin IgG, IgA, IgM levels. The results showed that:compared with the control group, the experimental groups showed the tendency that the level of plasma urea nitrogen and total cholesterol decreased while the level of blood glucose levels increased (P>0.05) ;the experimental groups improved serum immunoglobulin content of IgG, IgA (P> 0.05), but the content of IgM was less affected.
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