原料价格波动与水产饲料企业的应对   总被引：1，自引：0，他引：1  

刘兴旺 《饲料广角》2007,(24):45-46

中国是世界上最大的水产养殖国。随着水产养殖业的蓬勃发展,水产饲料行业也得到了快速、稳步的发展。到2005年,我国水产饲料产销量超过了1000万t。按"十一五"规划,从2005年到2010年,我国水产饲料的产销量还将翻一  相似文献   

家养水禽在A型流感病毒和新城疫病毒进化和疾病流行中的作用   总被引：5，自引：0，他引：5  

刘秀梵 《中国家禽》2007,29(15):1-7

高致病性禽流感和新城疫是最重要的两种禽病,近年来对世界家禽业造成了重创。由于家养水禽在这两种病原体的进化和疾病流行中占据着独特的地位,作者对此进行了详细探讨,为两种疾病的防控提出了积极有效的建议。  相似文献   

通过日粮调控降低犬排泄物中的臭气   总被引：1，自引：0，他引：1  

李红  刘伟  陈慧平 《中国工作犬业》2006,(4):30-31

随着人们的物质生活水平的不断提高,精神生活也丰富多彩,饲养犬的人也越来越多,从而带动了犬业蓬勃发展。同时犬的排泄物也给环境及家庭带来了很大的影响。如犬随地大小便,会造成环境的污染及影响城市形象。排泄物得不到很好的处理,则会侵蚀土壤、污染水质、特别是一些有机质在  相似文献   

应用硫氟磺酰胺毒饵防治红火蚁   总被引：9，自引：0，他引：9  

罗礼智  覃贵亮  王漫波  彭启德  刘华荣 《植物保护》2006,32(1):22-27

应用硫氟磺酰胺毒饵在广西陆川防治25hm^2红火蚁的结果表明，施药后3d蚁巢内即有红火蚁个体死亡。施药后7、14、21d的防治效果分别可达81．5%,93．9％和100%；施药后余下的顽固蚁巢和7d后出现的新蚁巢经再度施药后14d全部死亡；从5月23日到11月25日蚁群全部死亡的5欢监测、调查，既诱捕不到工蚁，也没有发现新蚁巢。因此，硫氟磺酰胺毒饵不仅具有高效、快速、安全、使用方便等特点，而且硫氟磺酰胺的应用完全可以取代目前国外普遍使用的二步施药法中的灌巢法。  相似文献   

A high-throughput glasshouse bioassay to detect crown rot resistance in wheat germplasm   总被引：3，自引：0，他引：3  

V. Mitter  M. C. Zhang  C. J. Liu  R. Ghosh  M. Ghosh  S. Chakraborty 《Plant pathology》2006,55(3):433-441

A high-throughput and reliable seedling bioassay to screen wheat germplasm for crown rot resistance was developed. Single wheat seedlings were grown in square seedling punnets in a glasshouse and inoculated with a monoconidial Fusarium pseudograminearum isolate 10 days after emergence. The punnets were laid horizontally on their side and a 10- µ L inoculum droplet placed on the stem base. Seedlings were incubated at near-saturated relative humidity, and crown rot severity was assessed 35 days after inoculation. Studies on the duration of incubation period, inoculum concentration and temperature were carried out to optimize these parameters. Seedling growth at 25/15(±5)°C in a glasshouse and 48-h incubation at near-saturated RH in darkness gave the best results. When crown rot resistance rankings of 16 Australian cultivars from the bioassay were compared with their field performance, Spearman's rank correlation coefficient was highly significant. This indicated that the seedling bioassay mimicked field resistance to crown rot in adult plants. A bootstrap resampling analysis showed little or no improvement in the coefficient of variation with an increasing number of replications, indicating a high level of precision and reproducibility. By detecting small but consistent differences in crown rot severity, the bioassay proved effective in large-scale screening for partial resistance: already over 1400 wheat genotypes have been screened. The high degree of precision makes this an invaluable tool in the understanding of pathogen aggressiveness, host specialization and parasitic fitness.  相似文献   

Toxicity and biochemical action of amicarthiazol on citrus canker pathogen, Xanthomonas citri ex Hasse     

Qingchun Huang  Jihua Wu  Xiaotao Li  Manhui Liu  Yuping Kong 《Pesticide biochemistry and physiology》2006,84(3):188-195

Inhibitory effects of amicarthiazol, in vitro, against the growth of seven plant bacterial pathogens and its biochemical actions on Xanthomonas citri were investigated. The growth of Erwinia carotovora, Ralstonia solanacearum, and Pseudomonas syringe pv. syringae was not sensitive to amicarthiazol whilst Xanthomonads were all strongly inhibited in NB liquid medium; EC₅₀ of X. citri was 2.63 μg ml⁻¹ and the effectiveness of amicarthiazol depended on the timing of application. The inhibitions on the secretion of gross EPS and gross EPR as well as the activities of amylase, cellulase, and pectase of X. citri were increased with the concentrations of amicarthiazol, whereas the conductivities of the extracellular product suspensions and the protease activity were somewhat accelerated by the concentration less than 10 or 20 μg ml⁻¹ and inhibited only at higher concentration. EPS which was purified from X. citri showed obvious antagonistic effects on the inhibition of amicarthiazol, but not on the inhibition of Cu(OH)₂. The endogenous respirations and the activity of succinic dehydrogenase of X. citri were also inhibited and the inhibitions were increased with the toxic concentrations. Furthermore, the potential induced physiological adaptability of X. citri to amicarthiazol and the comparison with Cu(OH)₂ and carboxin were also discussed.  相似文献   

Construction of Brucella ClpS Gene Mutant Strain and Its Effect on Virulence     

LIU Yufu  DONG Hao  SUN Shijing  PENG Xiaowei  CHEN Ruiai  DING Jiabo  JIANG Hui 《中国畜牧兽医》2007,47(11):3767-3773

The present study aimed to determine the role of ClpS gene,and to analyse the impact of ClpS mutation on the virulence of Brucella.A ClpS gene mutant strain,named ΔClpS was constructed by homologous recombination technology.The bacterial growth kinetics,the LPS synthesis ability and the survival ability of bacterial within macrophages as well as the virulence in mouse model were measured.In addition,the difference between parent strain 2308 and the mutant strain ΔClpS were compared.The results showed that under the same culture conditions,no difference in bacterial concentration was observed between 2308 and ΔClpS strains.The silver staining examination showed that the expression level of LPS extracted from two strains were similar,indicating ClpS gene mutation did not alter the growth rate and LPS synthesis ability of Brucella. In the cell infection assay,the survival ability of ΔClpS strain in cells was extremely significantly lower than that of 2308 strain at 72 h after infection (P<0.01).The results of mouse infection experiment showed that in the first week after infection,no significant difference in spleen weight and bacterial concentration between 2308 and ΔClpS strains infected mice was observed.However,at 4 weeks after infection,the bacterial concentration in spleen of ΔClpS infected mice was 10^3.93 CFU/g spleen,which was significantly lower than that of 2308 strain (10^6.68 CFU/g spleen,P<0.01).The spleen weight of ΔClpS infected mice was also remarkably lower than that of 2308 strain (P<0.01).In summary,the results suggested that the ClpS gene of Brucella did not play a role in Brucella growth rate and ability of LPS synthesis,whereas ClpS gene mutation decreased the ability of Brucella colonization in mouse spleen.  相似文献   

华南地区规模化猪场猪瘟抗体水平的血清学调查及免疫水平低下原因分析   总被引：1，自引：0，他引：1  

李儒曙  李静  江鹏华  张健騑  刘宇 《中国动物检疫》2007,24(11):30-31

猪瘟(CSF)是由猪瘟病毒(CSFV)感染猪而引起的一种急性、热性、高度接触性传染病,其流行广泛,病猪死亡率高。但世界上猪瘟的流行和发病特点自20世纪70年代以后发生了很大的变化,其流行形式已从以前频繁发生的大流行转为周期性、波浪形的地区性散发性流行。非典型猪瘟是目前  相似文献   

氟苯尼考的研究应用进展   总被引：9，自引：0，他引：9  

陈晓慧  刘明春  焦阳 《中国家禽》2006,28(14):50-52

氟苯尼考（florfenicol）又称氟甲砜霉素，是美国先灵一葆雅公司于1988年研制成功的一种新型兽医专用氯霉素类广谱抗菌药，其化学名称为D（＋）-苏-1-对甲砜基苯基-2-二氯乙酰氮基-3-氟丙醇。它具有抗菌谱广、吸收良好、体内分布广、安全高效、耐药性发生率低等特点，对敏感菌所致的畜禽细菌性疾病治疗效果显著。目前，已在亚洲、欧洲、美洲等20多个国家上市，主要用于禽、猪、牛、鱼等疾病的治疗。我国现已通过该药的审批，生产的剂型有水针剂、溶液和散剂等。  相似文献   

鸡多杀性巴氏杆菌的分离与鉴定     

胡杰  赵国明  陆文俊  杨春龙  马丽丽  黄夏  刘棋  陆承平 《中国家禽》2006,28(17):22-23

根据发病情况和病理变化,结合病原分离、动物试验、毒素试验、生化试验、药敏试验等,证实广西某鸡场鸡群急性死亡是由鸡多杀性巴氏杆菌引起的禽霍乱。  相似文献