摘要
本试验用装有永久性瘤胃瘘管、十二指肠近端T型瘘管的3只湖羊（35±5）kg作为试验动物，按3×3拉丁方试验设计方案，研究了日粮蛋白质水平分别为8．4％（A）、11．2％（B）、14．0％（C）时对湖羊瘤胃和十二指肠pH值、氨态氮、尿素氮浓度的影响。结果表明：①瘤胃pH为6.31～6．43，各组间差异不显著（P〉0.05）；十二指肠pH为2．64～2．70，各组间差异不显著（P〉0．05）。②瘤胃氨态氮浓度（3．24～11．99）mg/100mL，C组极显著高于A、B组，B组极显著高于A组（P〈0．01）；十二指肠氨态氮浓度（3．01～7．88）mg/100mL，C组极显著高于A、B组，B组极显著高于A组（P〈0．01）。③瘤胃尿素氮浓度（13．81～17．51）mg/100mL，C组极显著高于A、B组（P〈0．01），B组显著高于A组（P〈0．05）；十二指肠尿素氮浓度（4．1～5．91）mg／100mL，B、C组极显著高于A组（P〈0．01），B组与C组差异不显著（P〉0．05）。
Three Hu sheep （35 ± 5） kg fitted with permanent ruminal cannulas, proximal duodenal T-shaped cannulas were used to investigate the effects of three different dietary protein levels on pH, NH3-N and Urea-N in gastrointestinal tract. The method of 3 × 3 Latin squaredesign was applied with three treatments for CP concentration in diets as 8.4% （A）, 11.2% （B） and 14. 0% （C）, respectively. The result showed ： ①Average pH values in rumen and duodenum varied between 6. 31 - 6.43 and 2. 64 - 2.70, respectively, and the different level of CP in diet had no significant effects on the gastrointestinal pH. ②The content of NH3-N both in Rumen and duodenum changed between （3.24 - 11.99） mg/100 mL and （3.01-7.88） mg/100 mL respectively, and the concentration of NH3-N in gastrointestinal tract in C group was higher than A and B groups, while A group was lowest （P 〈 0. 01 ）. ③Ruminal Urea-N ranged between （ 13.81 - 17.51 ） mg/ 100 mL, the concentration of Urea-N in C group was highest, lowest in A and middle in B. Duodenal Urea-N was （4. 1 - 5.91 ） mg/100 mL, the concentration of Urea-N in B and C groups were extremely higher than that in A （P 〈0. 01 ）, but no significant effect occurred between B and C groups （P 〉 0. 05 ）.
出处
《畜牧与兽医》
北大核心
2008年第3期34-39,共6页
Animal Husbandry & Veterinary Medicine
