Effects Of Dietary Wheat Bran Levels On Performance And Nutrient Utilization And Tibia Quality In 3-6 Weeks Broilers

Under the condition of equal level of apparent metabolic energy, protein, calcium, total phosphorus, available phosphorus, linoleic acid, cure fiber, and main essential ammonia acids (such as Lys, Met, Met+Cys, Ile, Thr, Trp,and Arg), a study was conducted to investigate the effects of dietary wheat bran levels (0%,3%,6%,9%) and 9% wheat bran plus 500IU/Kg microbial phytase on productive performance, utilization of main nutrients and tibia quality in broilers.The purpose of this study as follows:1. To study the effects of wheat bran levels in diet on productive performance, apparent utilization of main nutrients, and tibia quality in 3-6 weeks broiler chickens.2. To investigate the impact of natural plant phytase in wheat bran diet on total phosphorus utilization of whole experimental diets and serum parameter in broilers.3. To determine the effect of wheat bran levels on feces moisture. The result of the study showed:1. Under the condition of equal level of main dietary nutrient, the diet contain of 9% wheat bran had significantly affected the apparent utilization of dry material(DM), and total phosphorus(TP). The treatment of 9% wheat bran increased the apparent utilization of DM and TP vs. 0%, 3%, 6% wheat bran groups by 7.50% (p<0.05), 8.67%(p<0.05), 4.92%(p<0.05), 29.94% (p>0.05), 27.62% (p<0.05), and 18.75%(p<0.05), respectively. The average daily body gain (ADG), Ca and P content in serum, tibia ash in 9% wheat bran group had no significant difference with the control group without wheat bran (p>0.05). But feed/gain efficiency and fecal moisture in 9% wheat bran group decreased significantly with the control group without wheat bran by 11.16%(p<0.05) and 4.64% (p<0.05), respectively. The 9% wheat bran group increased tibia P content significantly compared with the control group without wheat bran by 16.75%(p<0.05). Under this condition (9% wheat bran level), adding 500IU/Kg microbial phytase is no significant effect on productive performance, Ca and P in serum, apparent nutrient utilization, and tibia quality (p>0.05).2. Using 3% and more upper wheat bran level in broiler's diet decreased fecalmoisture significantly (p<0.05). The fecal moisture in 3%,6%,9% wheat bran groups and 9% wheat bran plus 500IU/Kg microbial phytase group decreased fecal moisture compared with the control group without wheat bran by 4.43% (p<0.05), 4.89% (p<0.05), 4.64%(p<0.05),and 3.34%(p<0.05).3. Under the condition of equal level of dietary nutrition, the ADG, ADFI in 3% and 6% wheat bran groups were lower than the control group without wheat bran significantly. Comparing with the control group, the treatment of 3% and 6% wheat bran group decreased ADG and ADFI by 6.85%(p<0.05), 12.59% (p<0.01), 2.81%(p<0.05), and 12.35%(p<0.01), respectively. The feed/gain efficiency in 3% and 6%wheat bran group were significant better than the control group. The feed/gain efficiency in 3% and 6% wheat bran group decreased by 6.05%(p<0.05), and 9.77%(p<0.05) vs. the control group.4. Synthesizing the result of this study, if dietary nutrition is satisfied with the requirement of 3-6 weeks broiler chickens, it is beneficial the diet contains 6%-9% wheat bran. Under normal phosphorus level, it is not significant useful adding microbial phytase when the diet contains 9% wheat bran.5. It is going to research for the further that the effects of diet which contain more than 9% wheat bran and adding microbial phytase to low available phosphorus and high wheat bran diet on productive performance, and nutrient utilization in 3-6 weeks broiler chickens.