【摘要】 在山羊绒生长旺盛期(9月～12月) ,选用12只安装有永久性瘤胃瘘管和十二指肠瘘管的二狼山型白绒山羊 ,采用完全随机设计研究日粮硫水平为0.15 %、0.18 %、0.22 %、0.28%,其氮硫比为10.55:1、8.73:1、7.39:1、5.68:1 ,对绒山羊瘤胃发酵、营养物质消化率、瘤胃微生物蛋白产量、十二指肠食糜流通量及饲料纤维物质降解率的影响。试验结果表明 :采食不同的氮硫比日粮的绒山羊 ,其采食量不受影响(P>0.1) ;硫的沉积及消化率呈线性增加(P<0.05)。日粮硫含量为0.22 %,氮硫比为7.39:1时 ,DM、ADF、OM的消化率最高(P<0.05) ;可消化氮、沉积氮、沉积氮占可消化氮的比例显著高于其它组(P<0.05)。添加硫使瘤胃液的 pH值升高(P<0.05) ,瘤胃液的NH3-N浓度降低。采食不同氮硫比日粮的绒山羊瘤胃食糜流通速率Kp 为4.88 %/h～6.29 %/h ,对其瘤胃总氮流量及总硫流量影响不大(P>0.05) ,但日粮氮硫比为7.39 :1组的瘤胃微生物氮流量、十二指肠微生物氮流量、十二指肠总硫流量高于其它组(P>0.05)。添加硫使青干草中DM、ADF的瘤胃有效降解率显著提高(P<0.05)。更多还原

【Abstract】 During cashmere fast-growing period(Sept.—Nov.),twelve castrated male cashmere goats with permanent ruminal and duodenal cannula were used to evaluate metabolic response of cashmere goats to sulfur supplementation.Goats had ad Librium access to diets containing S 0.15%(basal)、0.18%、0.22%、0.28 and giving N:S ratios of 10.55:1、8.73:1、7.39:1、5.68:1.Feed intakes were not affected(P>0.1) by dietary S level.S retention and apparent digestibility exhibited linear increase(P<0.05).Apparent digestibilites of DM、ADF、OM were qudraticaly increased(P<0.05) by S supplementation;digested N、Retained N、retained N/digestied N of diet containing 0.22%S and N:S ratio 7.39:1 were higher than other treatments(P<0.05).The rumen pH was significently increased(P<0.05),but the concentration of rumen ammonia N deccreased.There were no significent effect of different N:S ratio diets on ruminal digesta passage rate.Total nitrogen and sulfur flowing out of the rumen were not siguificutey differnt among four diets(P>0.05).Microbial nitrogen and total sulfur flowing into the duodenum of cashmere goats were higher than other treatments(P>0.05).It was showed that diet containing 0.22%S and N:S ratio 7.39:1 was better during cashmere fast-growing period.更多还原