【作者】 张昌吉；

【导师】 郝正里； 李发弟；

【作者基本信息】 甘肃农业大学 ， 动物营养与饲料科学， 2005， 硕士

【摘要】 试验选用3只健康，并装有永久性瘤胃瘘管的杂种羯绵羊，采用3×3无重复拉丁方试验设计。研究以玉米秸、小麦秸和苜蓿草为粗料的全饲粮颗粒中添加不同水平酵母培养物(基础饲粮+0％YC、基础饲粮+1.5％YC和基础饲粮+3％YC，基础饲粮粗、精比为67：33)对绵羊营养物质消化、代谢及瘤胃内环境的影响。试验分三期，每期预试期10天，正试期6天，共16天，全期48天。试验结果表明：(1)添加1.5％和3％YC的全饲粮颗粒，有提高绵羊干物质采食量(DMI)和有机物采食量(OMI)的趋势(P=0.255和P=0.324)，粗纤维(CF)、中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)的采食量均无显著影响(P＞0.05)。(2)添加YC1.5％和3％，对饲粮DM、OM、CF、ADF和NDF在全消化道中的消化率均有提高的趋势(P=0.277、P=0.151、P=0.073、P=0.102和P=0.091)。(3)添加YC，对饲粮粗蛋白质(CP)的表观消化率无显著影响，但显著提高了N的存留率(P=0.021)；(4)全饲粮颗粒料中添加YC，对绵羊瘤胃液pH值、瘤胃液总氮、氨态氨、尿素氮和蛋白氮的浓度均无显著影响(P＞0.05)。(5)全饲粮颗粒中添加YC，有提高绵羊瘤胃液总挥发性脂肪酸(TVFA)浓度的趋势(P=0.053)，仅在食后2h显著提高(P=0.022)，其他时段影响不显著。(6)综合各项指标表明，在粗饲料为主的绵羊全颗粒饲粮中添加YC，具有一定促进食欲、增强消化代谢的效果。(7)两YC添加水平之间，上述各项测定指标差异均不显著(P＞0.05)，综合考虑添加效果和成本，以添加1.5％为好。更多还原

【Abstract】 Three crossbred wethers fitted with permanent rumen fistula were chosen to measure the influence of complete pelleted diets supplemented with different level of YC on digestion and metabolism and ruminal fermentation in sheep.Roughage/concentrate ratio of basal diet(BD) is 67:31. Treatments(BD+0%YC,BD+1.5%YC and BD+3%YC) in the trail were designed as a 3 X 3 latin square with 3 periods of 16-day of each period in the trail. The results are as follows:(1) A trend towards higher intake of DM and OM (P=0.225 and P=0.324) in complete pelleted diets supplemented with 1.5% or 3%YC was obversed; There was no significant effects on intake of CF,NDF and ADF(P>0.05).(2) A higher trend on digestibilitiy of DM, OM, CF, NDF and ADF was observed(P=0.277 、 P=0.151、P=0.073、P=0.102and P=0.091,respectively) when feeding diets supplemented with YC.(3) There were no significant difference on apparent nitrogen digestibility(P>0.05),but significant effect on nitrogen retention(P=0.022) when diets with YC were fed to sheep. (4)There were no significant difference on pH value, concentration of total nitrogen,ammonic nitrogen,urea nitrogen and protein nitrogen in rumen fluid of sheep among the treatments (P>0.05).(5) A trend towards higher on TVFA concentration in rumen fluid was observed when YC was added to BD, but significant effect only at 2h after feeding.(6) A trend better effect on improvement palatability and digestibility of the diets supplemented YC to feed sheep was noticed(7) There were no significant differences on all parameters determined between two level of supplementing YC.Adding 1.5%YC is superiority to 3%YC in the trail,taking into account the effects of feeding and cost.更多还原