运用Rusitec测定不同含N饲料对麦秸降解率的影响

本研究运用Rusitec研究鱼粉、酪蛋白、豆粕(SBM)和尿素对麦秸纤维降解率的影响。试验结果表明 ,经48小时培养 ,添加SBM和鱼粉导致较高的中性洗涤纤维(NDF)降解率(57.4 %和56.5 %) ,添加尿素导致较低的NDF降解率(54.5 %,P<0.05) ,添加酪蛋白没有作用 ;添加SBM和鱼粉导致较高总VFA和乙酸产量 ,说明对纤维降解有刺激作用 ;4种含N饲料导致相似的外流氨基酸比例 ,添加蛋白质饲料导致外流的总氨基酸N(TAAN)比例高于尿素(P<0.05) ;微生物合成效率与纤维降解无直接联系

THE EFFECT OF DIFFERENT NITROGEN SUPPLEMENTS ON BARLEY STRAW DEGRADATION BY USING RUSITEC

The influence of supplementation with fish meal,casein,soybean meal(SBM) or urea on fibre degradation of barley straw was studied in Rusitec.Supplementations with SBM and fish meal resulted in higher NDF degradabilities(57.4% and 56.5%,respectively) than urea(54.5%) after 48h incubation(P<0.05)whereas supplementation with casein did not differ significantly from the other N supplementation(P>0.05).Total VFA and acetic production supported the stimulatory effect of SBM and fish meal.The proportion of total amino acid in the total N of the outflow resulted from the four supplements was similar but the proportion of total amino acid N resulted from the protein supplements was much higher than from urea supplement.Microbial syntheses were not apparently correlative with fibre degradation.