【作者】 斯琴毕力格；

【导师】 敖长金；

【作者基本信息】 内蒙古农业大学 ， 动物营养与饲料科学， 2017， 硕士

【摘要】 本试验以泌乳奶牛为研究对象,探讨了菊科植物黄花蒿乙醇提取物对奶牛瘤胃内环境指标、生产性能的影响,并对奶牛乳中CLA含量及乳脂脂肪组成的影响也进行了初步分析。选取体重(600±29kg)、胎次(2～3)、泌乳期(158±3d)及泌乳量(22.8±1.8kg/d)相似的15头泌乳荷斯坦奶牛,采用完全随机区组试验设计,试验分为对照组和2个试验组,对照组饲喂基础日粮,试验1组和试验2组的奶牛基础日粮中分别添加96g/d.头和160g/d.头黄花蒿乙醇提取物,每组5头奶牛。进行为期40d的饲养试验,其中前9d为预饲期,10～40d为正式期。试验结果表明:与对照组相比,添加黄花蒿乙醇提取物对2个试验组奶牛的瘤胃pH值和乙酸浓度均无显著影响(P>0.05);2个试验组奶牛瘤胃液丁酸浓度和丙酸浓度均显著低于对照组(P<0.05),试验1组和试验2组之间没有显著变化(P>0.05);与对照组相比,各试验组的异戊酸浓度均有下降的趋势,其中试验2组的异戊酸浓度显著低于对照组,试验2组异戊酸浓度也显著低于试验1组(P<0.05);2个试验组的戊酸浓度低于对照组,其中试验2组的戊酸浓度显著低于对照组(P<0.05),2个试验组之间差异不显著(P>0.05);添加黄花蒿乙醇提取物对奶牛产量奶、乳脂率、乳蛋白率、总固体含量、非脂乳固体、乳糖率均无显著影响(P>0.05);添加黄花蒿乙醇提取物增加了 2个试验组奶牛乳中CLA含量,试验1组和试验2组奶牛乳中CLA含量分别提高了 30.7%和38.6%,其中试验2组乳脂中CLA的含量显著高于对照组(P<0.05),2个试验组之间无显著变化(P>0.05);对照组和2个试验组乳脂中的饱和脂肪酸、不饱和脂肪酸、单不饱和脂肪酸、多不饱和脂肪酸、短链脂肪酸、中链脂肪酸、长链脂肪酸均无显著差异(P>0.05)。更多还原

【Abstract】 In this experiment,lactatingdairy cows were used as the research object.effects of the compositae artemisia annua extracts on VFA in the rumen,performance in the lactating Holstein dairy cows,and effects of CLA content and milk fat composition in dairy cows were also analyzed.Fifteen holstein dairy cows were divided into 3 groups randomly according to their milk yield(22.8±1.8 kg/d),body weight(600±29 kg)and lactation period(158±3 d),and animalexperiment were 40 days including 1-9 days for adaptation and 10-40 days for sampling.In the control group,the experimental Holstein dairy cows were fed with the basal diet,and for the other 2 experimental groups were fed with the basal diet supplemented with 96 g artemisia annua extracts(experimental group 1),and 160 g artemisia annua extracts(experimental group2).The results showed that no significant were found in the ruminal concentrations of acetate and pH value(P>0.05);Two experimental group apparently decreased the ruminal concentrations of butyrate and propionate(P<0.05);compared with the control group,the ruminal concentrations of isovaleratein the experimental group was apparentlydecreased,and there was a significant difference between the experimental group 1 and experimental group2(P<0.05);ruminal concentrations of valerate is higher than the experimental group in the control group,and there was a significant difference between the control group and experimental group2(P<0.05).compared with the control group,supplumentatin of Artemisia annua extracts for milk yield,milk fat percentage,milk protein percentage,milk tota lsolid content,non-fat milk solid content,lactose percentage,here were no significant differences among all groups(P>0.05).However,the conjugated linoleic acid in the experimental group 1 and experimental group2 was increased by 30.7%,38.6%,respectively,and there was a significant difference between the control group and experimental group2(P<0.05).Compared with the control group,milk fat of saturated fatty acid,unsaturated fatty acid,monounsaturated fatty acid,polyunsaturated fatty acid,shot chain fatty,medium fatty and long chain fatty acid,here were no significant differences among all groups(P>0.05).更多还原