仔猪王718仔猪补充饲料饲喂效果试验

试验选择４０头２８日龄提前奶、体重约７．５ｋｇ的３５日龄长大二元杂交仔猪，随机分成２组，每组２０头，分别饲喂正大３１１仔猪全价颗粒饲料和仔猪王７１８仔猪补充料，经过２４ｄ的试验，结果表明，试验组仔猪生长速度比对照快３．３７％，料肉比降低５．４１％，每ｋｇ增重饲料成本降低１４．５４％。     

日粮添加“仔猪健”对仔猪生产性能和抗拉稀效果观察及分析

为探讨＂仔猪健＂对仔猪生产性能及抗拉稀效果的影响,试验选择35-40日龄杜长大/杜大长仔猪80头,随机分成实验组和对照组,每组40头,对照组用普通4%乳猪预混料配制基础日粮,试验组在对照组基础日粮的基础上另按1%比例添加＂仔猪健＂,试验期28天。结果表明试验组仔猪在腹泻率、头均增重、头均日增重、料肉比等方面均优于对照组,经济效益明显。     

日粮添加"仔猪健"对仔猪生产性能和抗拉稀效果观察及分析

为探讨"仔猪健"对仔猪生产性能及抗拉稀效果的影响,试验选择35-40日龄杜长大/杜大长仔猪80头,随机分成实验组和对照组,每组40头,对照组用普通4%乳猪预混料配制基础日粮,试验组在对照组基础日粮的基础上另按1%比例添加"仔猪健",试验期28天.结果表明试验组仔猪在腹泻率、头均增重、头均日增重、料肉比等方面均优于对照组,经济效益明显.     

中草药注射液对仔猪大肠杆菌病治疗效果研究

根据中兽医学理论和中医药在现代医学上的应用成果,以石膏、滑石、白头翁、苍术等组方制成中草药注射液,经过药敏对比试验、对比治疗试验及区域性治疗试验,其对仔猪黄白痢最高治愈率97.6%,平均为97.3%.     

探究大肠杆菌对抗生素的抗药性

以大肠杆菌为材料,比较3种头孢类抗生素对大肠杆菌的杀菌效果,并进行耐药大肠杆菌的重复培养,观察细菌抗药性的产生。结果表明,抗生素经常使用是导致细菌抗药性产生的重要原因。     

细菌对抗生素耐药性的研究进展

抗生素的不合理使用所导致的细菌耐药性是全球关注的公共卫生问题。本文简要综述了抗生素的抑菌机理、细菌的耐药机制、耐药菌的检测、耐药性产生因素以及预防。     

抗生素对土壤微生物影响的实验设计

抗生素的种类很多,其作用机理是抑制细菌等微生物的生长和繁殖,可被用来达到治病的医疗目的。为了证明抗生素的抗菌作用,本文设计了一些探究活动。     

提高哺乳仔猪成活率的关键措施

根据哺乳仔猪的主要生理特点,饲养好仔猪应做到给它早吃初乳、保温防压防冻、均窝寄养、防止黄白痢病、及时补铁和硒、剪尾剪牙及提早开食补料。     

解脲脲原体感染及药物敏感性分析

目的:了解泌尿生殖道解脲脲原体感染现状及对10种抗生素耐药情况.指导临床合理用药.方法:应用支原体鉴定及药敏试剂盒检测304例泌尿系感染患者,同时测定其对常用抗生素的药物敏感性.结果:解脲脲原体感染的阳性率为136株(44.7%).男性解脲脲原体阳性10例(22.22%,10/45),女性解脲脲原体阳性126例(46.84%,126/269).药敏试验结果表现不同的敏感性.结论:泌尿生殖道支原体对所分析的各种抗生素都存在不同程度的耐药.在进行解脲脲原体感染治疗之前应进行药物敏感试验.     

Response to weaning and dietary L-glutamine supplementation: metabolomic analysis in piglets by gas chromatography/mass spectrometry

A novel metabolomic method based on gas chromatography/mass spectrometry (GC-MS) was applied to determine the metabolites in the serum of piglets in response to weaning and dietary L-glutamine (Gln) supplementation. Thirty-six 21-d-old piglets were randomly assigned into three groups. One group continued to suckle from the sows (suckling group), whereas the other two groups were weaned and their diets were supplemented with 1% (w/w) Gln or isonitrogenous L-alanine, respectively, representing Gln group or control group. Serum samples were collected to characterize metabolites after a 7-d treatment. Results showed that twenty metabolites were down-regulated significantly (P<0.05) in control piglets compared with suckling ones. These data demonstrated that early weaning causes a wide range of metabolic changes across arginine and proline metabolism, aminosugar and nucleotide metabolism, galactose metabolism, glycerophospholipid metabolism, biosynthesis of unsaturated fatty acid, and fatty acid metabolism. Dietary Gln supplementation increased the levels of creatinine, D-xylose, 2-hydroxybutyric acid, palmitelaidic acid, and α-L-galactofuranose (P<0.05) in early weaned piglets, and were involved in the arginine and proline metabolism, carbohydrate metabolism, and fatty acid metabolism. A leave-one-out cross-validation of random forest analysis indicated that creatinine was the most important metabolite among the three groups. Notably, the concentration of creatinine in control piglets was decreased (P=0.00001) compared to the suckling piglets, and increased (P=0.0003) in Gln-supplemented piglets. A correlation network for weaned and suckling piglets revealed that early weaning changed the metabolic pathways, leading to the abnormality of carbohydrate metabolism, amino acid metabolism, and lipid metabolism, which could be partially improved by dietary Gln supplementation. These findings provide fresh insight into the complex metabolic changes in response to early weaning and dietary Gln supplementation in piglets.     

契丹小字 及其替换字研究

契丹小字 和 读[γal]，原字小读做[del &;#232;]，原字 为其变体。原字 与女真字[∫in]有字源关系，读音相同，原字杏应读[uei]。原字 读为[nel]，原字山变读[nel]，但在音节末尾可能带有隐现辅音。新出现的原字平是原字 的变体。原字 应读[tu∫]。原字 应读[le]。原字 读[m]。原字 可构拟为[uei]。文中解释的契丹语词有13条。     

聚合关系中语词替换的心理理据

大量的作家改笔和编者改编等动态言语事实表明,聚合关系中,语词的替换有其心理动因。根据话语接受者的接受心理,尤其是心理需要的不同层次,可以将聚合关系中语词替换分为三类:基于认知的替换;基于审美的替换;基于认同的替换。     

一个索氏提取器的替代装置

索氏提取器的替代装置采用有机实验室配套的标准磨口仪器组装而成，集连续回流提取法和渗漉法一体，具有渗漉法提取效率高和连续回流提取法溶剂用量少的优点。将其用于学生实验，提高了提取效率，缩短了实验时问，降低了实验费用和环境污染，还可省去购置索氏提取器的开支。     

抗生素与安全畜产品生产模式的探讨

本文阐述了抗生素的应用给人体来带的危害 ,要求采用安全的生产模式来生产畜产品 ,并提出要尊重动物的生长规律 ,在此基础上发展畜牧生产。