Effect Of Dietary Crude Fiber Levels And Supplementation Enzyme Preparation On Growth Performance For Gosling

The study comprised of three experiments. The experiment one was conducted tostudy the effect of different crude fiber levels (2.40%, 4.30%, 6.20%, 8.10%, 10.00%)ongrowth performance according to the single-factor design. The experiment two wasundertaken to examine the effect of different enzyme preparation levels on growthperformance, nutrient digestibility, intestinal morphology, serum biochemical parameters,physico-chemical property and chemical digestion of intestine digesta, endogenousdigestive enzyme and caecal microbial population for gosling, the diet with stuff of highfiber content was added 0, 0.2% and 0.4% enzyme preparation for the experimentalgroups. The experiment three was performed to study the optimum requirement of crudefibre and supplementation level of enzyme preparation for goslings by using two factorsquadratic regression orthogonal rotational combing design. The results showed asfollows:The experiment one: crude fiber levels significantly influenced the growthperformance of gosling (P＜0.05), and the 4.3% group gained the best performance. Thegrowth performance of the 4.3% group had no significant difference to that of the 2.4%group (P＞0.05), and had noticed differences to those of others group (P＜0.05).The experiment two: enzyme preparation significantly improved average daily gainand feed conversion ratio (P＜0.05). Enzyme preparation significantly increased energymetabolizability and digestibility of crude fiber, crude protein and neutral detergent fiber,but had no remarkable effect on digestibility of dry matter, crude fat and acid detergentfiber. Enzyme preparation significantly decreased the relative viscosity of duodenal andjejunal digesta. The pH of intestine had no noticed difference in all groups. Enzymepreparation significantly decreased relative weight of gizzard, proventficulus, duodenum,jejunum and ileum. Enzyme preparation significantly increased villus size of duodenumand jejunum, and villus to crypt ratio of duodenum and ileum significantly increased too.Enzyme preparation considerably decreased ileal crypt height (P＜0.05), and didn't affectthickness of intestinal wall. Supplementing enzyme preparation, the serum glucose, totalprotein and alanine aminotransferase, but enzyme preparation hadn't noticed influenceupon uric acid, total cholesterol, triglyceride and high-density lipoproteins. Enzymepreparation significantly increased insulin, triiodothyronine and insulin-like growthfactor-Ⅰ. Adding enzyme preparation, the percentage of thyroid stimulating hormone andgrowth hormone in the serum increased 16.44%, 19.18% and 18.84%, 21.74%respectively, and the percentage of glucagon and thyroxine decreased 12.07%, 14.36% and 13.79%, 15.40%, but failed to reach statistical significance (P＞0.05). Enzymepreparation significantly increased (P＜0.05) the trypsin and amylase activity of duodenaland jejunal digesta, but enzyme preparation didn't affect significantly (P＞0.05) theintestinal lipase activity and pancreatic digestive enzyme. Enzyme preparation had nosignificant effect on caecal microbial population.The experiment three: the levels of crude fiber and enzyme preparation in diet were5.032% and 0.269% respectively when the maximal average daily gain was 43.457g.When the levels of crude fiber and enzyme preparation in diet were 4.757% and 0.248%respectively, the optimum feed conversion ratio was 2.008.