添加酵母培养物对饲粮营养物质消化的影响　

Effect of supplement with yeast culture on the digestibility in sheep

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Zea mays秸、小麦Triticum aestivum秸和苜蓿Medicago sativa干草为粗料的全饲粮颗粒中添加不同水平酵母培养物(YC)对绵羊采食量和营养物质消化的影响,饲粮的粗/精比为67∶31。试验结果表明:添加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);添加YC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);添加YC对饲粮粗蛋白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)。

Three crossbred weathers fitted with permanent rumen fistula were chosen to measure the influence of complete pelleted diets suppiemented with different level of YC on intake and digestion 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）〈3 Latin square with 3 periods of 16-day of each period in the trail. The results are as follows： 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 observed; There was no significant effects on intake of CF, NDF and ADF （P〉0.05）. A higher trend on digestibility of DM, OM, CF, NDF and ADF was observed（P = 0. 277, P= 0. 151, P = 0. 073, P=0. 102 and P=0. 091 ,resPectively）when feeding diets supplemented with YC and 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.