Effect Of Different Forms Nitrogen Source On Performance,the Digestion And Metabolism And Blood Biochemical Materials In Sheep

In order to study the changes of performance, the digestion and metabolism and blood biochemical materials in sheep.eighty hybrid sheep(suffork X small-tailed nan sheep) of 5 months old were divided randomly into four groups. The control group was fed A(usual feed), the urea group, wrap urea group and combination group were supplied with B(2%urea), C(2%wrap urea), D(2%wrap urea+0.2%probiotic) diet respectively. The performance, the digestion and metabolism . the blood biochemical materials(AKP, GPT, GOT, BUN, pH) of sheep were measured respectively. The results as follows:(1) The tatal weight gain and average daily gain were not affected (P>0.05)when sheep were fed B, C and D diets compared with A diet, but the tatal weight gain and average daily gain was increased when the sheep fed C and D diet compared with other diets, the tatal weight gain of B diet was least than other diets.(2) The ratio deposit nitrogen and digestible nitrogen were increased by 3.68%-17.56% respectively, when sheep were fed C and D, but there were no difference(P>0.05). Urine nitrogen was decreased significantly(P<0.05) when sheep fed C and D diet. The deposit nitrogen was increased significantly(P<0.05) when sheep fed D diet compared with other diet.Among A, B. C and D diet, the dry matter, feces nitrogen, digestible nitrogen were no difference(P>0.05). (3)Dry matter digestion coefficient, nitrogen apparent digestion coefficient, ADF digestion coefficient, NDF digestion coefficient and AIA coefficient were increased significantly(P<0.05) when sheep fed D diet, among A. B and C diet, there were no difference(P>0.05).(4)the blood AKP was increased after 2 hours when sheep fed B. C and D dietthere were greater(P<0.05) compared with A diet, there were no difference(P>.05) after 4 hours among A, C and D diets. (5)Blood GOT was increased after 2 hour when sheep fed A, B> C and D diets,GOT was increased significantly(P<0.05) when sheep fed B diet compared with A diet, there were no difference(P>0.05) among A, B> C and D diets.(6)Blood GPT was increased when sheep fed A, B, C and D diets,GPT was increased quickly when sheep fed Bdiet,the blood GPT were greater(P<0.05) when sheep fed B, C and D compared with A diet,there were no difference(P>0.05) after 4 hours when sheep fed C and D diet compared with A diet.(7)The BUN were increased significantly(P<0.05) after 4 hours when sheep fed B^ C and D compared with Adiet, BUN peak appears after 2 hours.BUN changes with time,there were no difference(P>0.05) among A, B, C and D diets.but BUN were increased by 9% ~ 36.4% respectively when sheep fed B, C and D diets compared with A diet.(8)Blood pH were increased significantly(P<0.05) after 2 hours when sheep fed B diet compared with other diets,there were no difference(P>0.05) when sheep fed other diets,there were no difference(P>0.05) after 4 hours when sheep fed B, C and D diets compared with A diet.The result indicated that it was safety and significantly when sheep fed B, C and D diets. Furthermore, blood biochemical materials were in range of normal physiology, C, D diets has increased the N utilization comparing with A, B diets.