不同阴阳离子水平饲粮对绵羊瘤胃内环境参数的影响

采用4×4拉丁方试验设计,将8只装有瘤胃瘘管绵羊分为4组;饲粮DCAB采用（Na＋＋K＋-Cl-）meq/100gDM公式计算,按DCAB水平不同分为4个处理,即A（25）、B（35）、C（45）、D（55）,结果表明：（1）各处理瘤胃液pH值均在6.21-6.94之间变动,（P〉0.05）,各组在喂后3h下降到最低点。（2）B、C、D处理瘤胃液氨氮浓度各时间段平均值显著低于A处理（P〈0.05）;B处理喂后1h、3h、5h、7h NH3-N浓度显著低于A处理（P〈0.05）;处理NH3-N浓度变化于4.47-49.67mg/100mL之间。（3）B处理瘤胃液尿素氮各时间段浓度平均值显著高于A、C、D处理（P〈0.05）。（4）各处理瘤胃液乙酸、丙酸、丁酸、TVFA浓度及乙酸/丙酸值各时间段平均值间差异不显著（P〉0.05）;B、D处理丙酸浓度高于A、C处理（P=0.08）,A处理丁酸浓度高于B、C、D处理（P=0.06）,B、D处理乙酸/丙酸值低于A、C处理（P=0.07）。综合考虑,35 meq/100gDM DCAB水平有利于绵羊瘤胃发酵,该组合为最佳日粮。

Effect of Dietary Cation-anion Balance on Rumen Parameters of Sheep

In a 4 × 4 Latin square design, 8 Gansu High Mountain fine-wool fitted with permanent rumen fistula were given 4 dietsDCAB（Na^＋ ＋K^＋-Cl^- ） was 25（A）, 35 （B）, 45 （C）, 55meq/100gDM （D）]. The results indicated that： （1） The pH value in the rumen fluid of all treatments ranged from 6.21 to 6.94（ P〉0.05 ）; （2） Amonia-N concentration means of B, C, D were significantly less than A （ P〈 0.05 ） ; B were less than A at 1h, 3h, 5h, 7h after morning dosing （ P 〈 0.05 ） ;At lh after morning dosing, D was less than A, B, C （ P 〈 0.05 ） ; B changed between 4.47-49.67mg/100ml; （3） Urea-N concentration means of B were more than A, C, D （ P 〈 0.05 ）. （4） Concentration means of all treatments of acetic acid, propionic acid, butyric acid, TVFA and A/P value in rumen liquor were not significant at all time （ P 〉 0.05 ） ; Propionie acid concentrations of B, D were more than A, C （P=0.08）, ;Butyric acid concentration of A was more than B, C, D （P=0.06）, A/P value B, D were less than A, C （P =0.07）; Based on mentioned above, there was a conclusion that the diet with 1.5% urea, 25mg/Kg AHA, and 35meq/100gDM DCAB was advantageous to rumen metabolizability of sheep, which can enhance their productivities.