微贮荞花饲喂仔猪增重效果试验

用微贮养花和普通养花饲喂仔猪,进行对比试验。在60天试验期间,试验组猪比对照组猪平均多增重6．79kg,每头平均日增重430g,比对照组提高34％,增重效果极显著。     

Investigation of the relationship between SLA-1 and SLA-3 gene expression and susceptibility to Escherichia coli F18 in post-weaning pigs

Porcine post-weaning diarrhea and edema disease are principally caused by Escherichia coli strains that produce F18 adhesin. FUT1 genotyping and receptor binding studies divided piglets into E. coli F18-resistant and -sensitive groups, and the roles of SLA-1 and SLA-3 were investigated. SLA-1 and SLA-3 expression was detected in 11 pig tissues, with higher levels of SLA-1 in lung, immune tissues and gastrointestinal tract, and higher levels of SLA-3 also in lung and lymphoid tissues. Both genes were expressed higher in F18-resistant piglets, and their expression was positively correlated in different tissues; a negative correlation was observed in some tissues of F18-sensitive group, particularly in lung and lymphatic samples. Gene ontology and pathway analyses showed that SLA-1 and SLA-3 were involved in 37 biological processes, including nine pathways related to immune functions. These observations help to elucidate the relationship between SLA class I genes and E. coli F18-related porcine gastrointestinal tract diseases.     

抗旱耐热白三叶新品种选育初报

鄂牧一号白三叶是以美国瑞加和路易斯安那两个白三叶品种为原始材料，经单株抗性造反份系比较鉴定，多系混合杂交，品种比较和区域试验选育而成，历时１０年。该品种具有高产，抗旱，耐热和粗蛋白含量高等特性，是南方低山丘陵地区有推广应用前景的优良牧草和草坪植物。     

复合酶对新型饲料原料DDGS粗蛋白、能量和干物质利用率的影响

<正>玉米干酒糟及其可溶物(corn distillers dried grains with solubles,DDGS)是玉米加工工业的副产品,是生产工业酒精后,将酒糟醒液经固液分离后的滤渣与蒸发浓缩后的过滤浆液混合干燥而成的。近几年,我国的工业用燃料乙醇生产量大幅度增加,     

Pyruvate kinase is necessary for Brucella abortus full virulence in BALB/c mouse

Brucellosis, caused by a facultative intracellular pathogen Brucella, is one of the most prevalent zoonosis worldwide. Host infection relies on several uncanonical virulence factors. A recent research hotpot is the links between carbon metabolism and bacterial virulence. In this study, we found that a carbon metabolism-related pyruvate kinase (Pyk) encoded by pyk gene (locus tag BAB_RS24320) was associated with Brucella virulence. Determination of bacterial growth curves and resistance to environmental stress factors showed that Pyk plays an important role in B. abortus growth, especially under the conditions of nutrition deprivation, and resistance to oxidative stress. Additionally, cell infection assay showed that Pyk is necessary for B. abortus survival and evading fusion with lysosomes within RAW264.7 cells. Moreover, animal experiments exhibited that the Pyk deletion significantly reduced B. abortus virulence in a mouse infection model. Our results elucidated the role of the Pyk in B. abortus virulence and provided information for further investigation of Brucella virulence associated carbon metabolism.     

桑叶超氧物歧化酶（SOD）的研究

分别用高速冷冻离心法和低速室温离心法提取了桐乡青、湖桑１９７、团头荷叶白、尖头荷叶白４个品种的顶芽、第５位和第１０位叶以及蚕沙残桑叶的ＳＯＤ粗酶液，然后用ＮＢＴ光还原法和聚丙烯酰胺凝胶电泳分别分析测定了它们的活性及其同工酶。试验结果表明：用高速冷冻离心法和低速室温离心法提取的ＳＯＤ，其活性无显著差异；同一叶位的桑叶ＳＯＤ活性在不同桑品种之间无显著差异；同一桑品种不同叶位的ＳＯＤ活性有显著差异；蚕沙残桑叶的ＳＯＤ活性与第１０位叶的ＳＯＤ活性相当。发现桑叶中有３～４种ＳＯＤ同工酶。     

山黧豆低毒品种的筛选及栽培利用技术研究

对国内外引进的６５个山黧豆品种，经３年观察和农艺性状的测定以及β－草酰氨基丙酸（ＢＯＡＡ）、营养成分的分析，筛选出产量，蛋白质含量高，毒素含量低，经毒理学实验为安全饲用的黑龙江山黧豆－１，黑龙江山黧豆－２，西德山黧豆３个品种供生产中应用，还针对山黧豆作为饲草（料）推广应用中的播种量，磷肥施用量，压青及根茬肥效等栽培利用措施进行了探讨。     

三疣梭子蟹苗种生产的若干技术

根据１９９４～１９９６ 年进行三疣梭子蟹苗种生产的实践经验,将生产过程各个环节归纳总结,针对亲蟹蓄养、幼体培育密度、饵料投喂、水质管理等主要环节提出相应的技术措施,以期对梭子蟹的苗种生产起促进作用。     

晋西昕水河流域生态经济型防护林体系景观格局动态分析

本文以晋西昕水河流域为典型实例，概述了流域生态经济型防护林体系建设背景。依据流域内各类型区在不同时段的土地利用结构和生态经济特征，进行流域生态经济型防护林体系景观格局变化分析，表明了流域内景观多样性和异质性不断增加的发展趋势，以及确定各区主要发展方向，实行综合开发与治理的必要性，并提出了相应的流域生态经济型防护林体系动态调控途径。     

梅树品种分类研究进展

该文回顾了梅树品种分类方面的研究,重点介绍了３０年来的成果,将品种分类历程划分为４个阶段,即传统园艺分类阶段、品种收集整理阶段、形态系统分类阶段和综合系统分类阶段．概述了梅的起源、品种演化等方面的重要进展．