2010年1-9月陕西省饲料工业发展形势分析

<正>今年前3季度,陕西省饲料工业克服了饲料原料价格高位振荡运行和生产成本剧增的困难,积极应对,加快调整产品结构,努力拓展新市场,有力助推了饲料工业持续稳定发展。1饲料工业发展基本情况1.1饲料生产连创新高,产量产值持续增长据统计,陕西省前3季度饲料工业总产量达276.9万t,实现饲料工业总产值88.6亿元,分别比上年同期总产量261.7万t和总产值83.5亿元增长5.81%和6.11%。     

Seroprevalence of chlamydial infection in dairy cattle in Guangzhou, southern China

Chlamydia spp. are obligate intracellular gram-negative bacteria that cause a wide range of significant diseases in humans and animals worldwide, resulting in significant economic losses. Chlamydial infection in cattle has been reported in many countries including China. However, there has been no survey of chlamydial infection of dairy cattle in Guangzhou, southern China. The objective of the present investigation was to examine the chlamydial seroprevalence in dairy cattle in Guangzhou, subtropical southern China by using an indirect hemagglutination assay (IHA). The overall seroprevalence of chlamydial infection in dairy cattle was 7.25% (29/400). Greater than or equal to eight-yr-old dairy cattle had the highest seroprevalence (10.34%), followed by those that were ≥ 6 years old or < 7 years old dairy cattle (10.20%), although there were no statistically significant differences among different groups (P > 0.05). Dairy cattle with 5 pregnancies had the highest seroprevalence (10.81%). These results indicate that chlamydial infection was present in dairy cattle in Guangzhou, subtropical southern China, and integrated strategies and measures should be executed to control and prevent chlamydial infection and disease outbreak in the study region.     

浙江中华蜜蜂微卫星遗传多样性分析

浙江是中华蜜蜂的传统饲养区,本研究对浙江中华蜜蜂的微卫星遗传多样性进行了初步分析。结果发现浙江中华蜜蜂的遗传多样性较低,因此有必要对其采取更加有效的保护措施。     

Molecular divergence and application of the ITS-5.8S rDNA and RUBISCO spacer in <Emphasis Type="Italic">Porphyra haitanensis</Emphasis> Chang et Zheng (Bangiales,Rhodophyta)

To select a reliable and sensitive method for discriminating strains of Porphyra haitanensis, the nucleotide sequence of the internal transcribed spacer 1 to internal transcribed spacer 2 regions (ITS-5.8S) of nuclear ribosomal DNA and the intergenic spacer region of RUBISCO were compared in five wild and five cultivated Porphyra haitanensis strains. Based on molecular analyses, sequences of ITS-5.8S (about 1,210 bp) could be divided into three regions: ITS1, 5.8S, and ITS2. The ITS1 and ITS2 sequences of each strain differed, even between individuals collected from the same site. In contrast, 5.8S rDNA and RUBISCO spacer sequences were identical among the ten P. haitanensis strains, although differences were found among different Porphyra species. Phylogenetic analysis also supported these conclusions. These sequence features of highly conserved regions and diversified regions that occurred repeatedly in ITS-5.8S could be useful in discriminating germplasm of P. haitanensis strains or Porphyra species. In contrast, the RUBISCO spacer is only suitable for identifying Porphyra species. New coupled primers were designed to amplify only the 5.8S rDNA and ITS2 region of Porphyra. The sequences of these amplified fragments can be readily used to identify germplasm or to perform phylogenetic analysis of Porphyra spp.     

Efficiency of methods applied for goat estrous synchronization in subtropical monsoonal climate zone of Southwest China

Two experiments were undertaken to select the efficient method applied for goat estrous synchronization. In experiment 1, a total of 120 does (Capra hircus) were divided into five groups with a randomized block design, and the does of treatment 1 were synchronized by intravaginal sponges impregnated with 30 mg Levonorgestrel inserted for 10 days. Does of treatments 2, 3, and 4 were treated with further injection of 25 IU follicle-stimulating hormone (FSH), 0.05 mg prostaglandin F2 alpha (PGF_2α), and 25 IU FSH + 0.05 mg PGF_2α at sponge withdrawal, respectively. The does in the control group (n = 40) without estrous synchronization treatment and natural estrous does were observed. In experiment 2, a total of 140 does in five goat farms in breeding and non-breeding seasons were treated with the selective efficient procedure. The results presented that all the employed treatments were capable of inducing and synchronizing estrous goats. According to estrous response and economy, the use of intravaginal sponges impregnated with 30 mg Levonorgestrel and 0.05 mg PGF_2α (treatment 3) is the first choice for estrous synchronization, and 95.0% of synchronized does demonstrated estrus, which was significantly higher than that of treatment 1 (P < 0.05) and control group (P < 0.01). The percentages of ovulating of treatments 3 and 4 were the same (95.0%), which were significantly higher than that of treatment 1 (P < 0.01). The ovulation rates among different groups were not significant (P > 0.05). When the selective procedure was applied to five goat farms, 85.7% (120/140) of does demonstrated estrus, and the kidding percentage, litter size, and prolificacy rate were 53.6%, 0.95, and 177%, respectively.     

农药复合配制使用效果

介绍农药复合配制的方法,并进行药效试验,为推广使用提供依据.     

浅析计算机网络安全

计算机网络技术应用越来越广泛，网络的安全性和可靠性也已成为不同使用层次用户共同关心的问题。本文从森工企业网络应用的现状和管理方面就网络安全的重要性、理论基础、具备功能以及解决措施等方面进行了简单阐述，并强调指出森工企业在网络安全方面应增强防范意识。     

柳树辽宁壳多胞菌溃疡病的研究

柳树辽宁壳多胞菌溃疡病系我国新发生的一种柳树溃疡病,〔1〕病原菌经鉴定为一新种,定名为辽宁壳多胞菌StagonosporaliaoningensisZ.K.ZhongetZ.W.Yuan。〔2〕本病于4月下旬发病,5月中下旬分生孢子成熟,6月中下旬为孢子飞散和发病高峰期。病原菌以菌丝体在侵染枝干表皮下越冬,为翌年4月发病的初侵染源。     

有风险投资与无风险投资组合的研究

本研究通过引入单位风险的概念，并结合有效边界上的单位风险极小点，给出了各种情况下有风险投资和无风险投资的最优组合方案。     

土壤条件对伽师瓜品质和产量关系研究

“伽师瓜”是新疆优质甜瓜之一,属于晚熟品种,肉厚而脆,色美味佳,含糖量一般在13度以上,耐运输,耐贮藏,商品性好,目前已畅销香港、上海、北京、东北等地,享有很高的声誉。为进一步提高和巩固伽师瓜的品质和声誉,从1987年起,我们与喀什地区科委,伽师县科委等有关单位合作,在伽师县主要产瓜区之一的三乡进行了“土壤环境条件与伽师瓜品质产量关系研究”工作,目的是摸清土壤环境条件,进行瓜果土壤评价和潜力研究,总结甜瓜种植中的选土培肥和优质高产经验,以及配套的裁培技术措施,现将试验研究初步结果简介如下: