养殖与饲料2024年第4期酵母培养物对育肥羊生长性能和免疫指标的影响毛正梁，郭娟江苏省海安高新区畜牧兽医站，江苏海安226600摘要［目的］研究基础日粮中添加不同水平酵母培养物对育肥羊生长性能和免疫指标的影响，寻求具有促生长作用的替抗产品。［方法］选用160只体格健壮、体质量（40±2）kg的3~4月龄的育肥公羊作为研究对象，采用随机数字表法分为4组，分别饲喂在基础日粮中添加0%（对照组）、0.3%（低剂量组）、0.6%（中剂量组）和0.9%（高剂量组）酵母培养物的试验饲粮，试验期90d。分别测定育肥羊的平均日采食量、平均日增质量和料重比，并对育肥羊静脉血清中的IgG、IgA和IgM含量进行测定。［结果］与对照组相比，3个试验组育肥羊平均日增质量和平均日采食量显著升高，料重比显著降低，静脉血清中IgG、IgA和IgM含量显著提高，其中，添加0.6%酵母培养物的试验组育肥羊平均日增质量为176.56g，血清中IgG、IgA和IgM含量分别为29.25、191.25、2165.49μg/mL。［结论］饲粮中添加酵母培养物在一定程度上改善育肥羊的生长性能，提高育肥羊的免疫能力，添加0.6%酵母培养物的效果为佳。关键词酵母培养物；高精料饲粮；育肥羊；生长性能；免疫指标EffectsofaddingyeastcultureonthegrowthperformanceandimEffectsofaddingyeastcultureonthegrowthperformanceandim‐muneindexesoffatteningsheepmuneindexesoffatteningsheepMAOZhengliang,GUOJuanHaianHigh-techZoneAnimalHusbandryandVeterinaryStation,Haian226600,ChinaAbstractAbstract[Objectives]Theeffectsofaddingdifferentlevelsofyeastculturetothebasicdietonthegrowthperformanceandimmuneindexesoffatteningsheepwerestudiedtoprovidereferenceforseekingproductsinsteadofantibodieswitheffectsofpromotinggrowth.[Methods]160healthyfatten‐ingramsaged3-4monthswithabodyweightof(40±2)kgwereselectedandrandomlydividedinto4groupsusingarandomnumbertablemethod.Theywerefedwithexperimentaldietssupplementedwith0(controlgroup),0.3%(lowdosegroup),0.6%(mediumdosegroup),and0.9%(highdosegroup)yeastcultureinthebasicdietfor90days.Theaveragedailyintakeoffeed,averagedailygainofweight,andtheratiooffeedtoweightinfatteningsheepweredetermined.ThecontentofIgG,IgA,andIgMinthevenousserumoffatteningsheepweremeasuredaswell.[Results]Comparedwiththecontrolgroup,th...
