Diagnostic methods applied to analysis of an outbreak of equine influenza in a riding school in which vaccine failure occurred   总被引：3，自引：0，他引：3  

van Maanen C  van Essen GJ  Minke J  Daly JM  Yates PJ 《Veterinary microbiology》2003,93(4):291-306

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Equine influenza vaccine efficacy: the significance of antigenic variation     

Yates P  Mumford JA 《Veterinary microbiology》2000,74(1-2):173-177

To investigate the level of cross-protection induced by equine influenza H3N8 vaccines derived from different lineages, two studies have been carried out with ponies vaccinated with 'American-like' and 'European-like' vaccines and experimentally challenged with a European-like strain. The results demonstrated that equine influenza vaccines clearly protect against challenge with homologous virus if serum antibody titres are sufficiently high. On the other hand, protection is incomplete even when animals vaccinated with heterologous strains have comparative antibody levels. Nevertheless, the protection afforded by heterologous viruses can be improved by stimulating high levels of antibody. It would be advisable to update equine influenza vaccine strains regularly so that they contain similar strains to variants that are circulating in the field.  相似文献   

内蒙古阿拉善盟草原疯草危害调查   总被引：6，自引：0，他引：6  

樊泽峰  王建军  赵宝玉  董强  达能太 《中国草地学报》2006,28(2):56-59

采用现场调查和资料收集相结合的方法，对内蒙古阿拉善盟的阿拉善左旗、阿拉善右旗和额济纳旗3个旗疯草的种类、分布、危害及防治对策进行了调查研究。结果表明：阿拉善盟有疯草7种，其中棘豆属有毒植物3种，黄芪属有毒植物4种，分布面积超过139．33万hm^2，危害最严重的是小花棘豆和变异黄芪，给当地畜牧业造成了极大的危害，并就如何综合利用疯草提出了几点措施。  相似文献   

Farmers' attitudes towards techniques for improving oestrus detection in dairy herds in South West England     

Chris Garforth  Kevin McKemey  Tahir Rehman  Richard Tranter  Richard Cooke  Julian Park  Peter Dorward  Chris Yates 《Livestock Science》2006,103(1-2):158-168

Unidentified heats contribute to declining fertility rates in English dairy herds. Several techniques have been advocated to improve heat detection rates. Despite demonstrable technical efficacy and cost-effectiveness, uptake is low. A study in South West England used the Theory of Reasoned Action (TORA) to explore dairy farmers' attitudes and beliefs towards heat detection techniques. Few farmers were convinced that following prescribed observation times, milk progesterone testing and using pedometers would fit their system or improve on their current heat detection practices. Perceived difficulty of using a technique was not a constraint on adoption. Without promotion that addresses identified barriers and drivers to adoption, little change in current practice can be expected.  相似文献   

浙江天童国家森林公园常绿阔叶林主要组成树种材积与生物量相关关系探讨   总被引：2，自引：1，他引：2  

杨同辉  达良俊  宋坤  李修鹏 《福建林业科技》2007,34(4):110-112

以天童国家森林公园常绿阔叶林主要组成树种为研究对象,通过测定其各组分生物量,建立了实测生物量与材积之间的回归模型,结果表明:主要组成树种各组分生物量与其材积之间存在着密切的相关关系,各主要树种材积与生物量的回归模型存在差异;回归方程精度较高,用于根据地区常绿阔叶林主要树种材积推算其生物量是可行的。  相似文献   

氧化塘处理原木蒸煮废水     

达明珠 《木材工业》2005,19(1):33-34,39

介绍了原木蒸煮废水的处理方法,提出氧化塘法是小型木材加工厂处理该废水的最佳选择,并用实例简单介绍了氧化塘的设计选型问题.  相似文献   

Balloon occlusion of the caudal vena cava for vascular contrast studies as an aid to intravascular coil embolisation for the treatment of intrahepatic portosystemic shunts in three dogs          下载免费PDF全文

DA Cook  BJ Gavaghan  PA Moses 《Australian veterinary journal》2015,93(12):452-459

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Processes affecting the dissipation of the herbicide isoxaflutole and its diketonitrile metabolite in agricultural soils under field conditions     

Papiernik SK  Yates SR  Koskinen WC  Barber B 《Journal of agricultural and food chemistry》2007,55(21):8630-8639

Two-year field dissipation studies were conducted in three soil types in Minnesota to examine the processes affecting the dissipation of the herbicide isoxaflutole and its phytotoxic diketonitrile metabolite (DKN) under relatively cool, wet soil conditions. Plots of cuphea were treated with isoxaflutole and potassium bromide, a nonsorbed, nondegraded tracer. Replicate soil cores were collected six times during the growing season to a depth of 1 m, and the bromide or herbicide concentration was measured in each of five depth increments. The dissipation half-life (DT50) of isoxaflutole + DKN was 8-18 days in each soil. Bromide and herbicide concentrations were low at depths >40 cm throughout the study, and herbicide concentrations in soil 100 days after application were usually undetectable. Simulation modeling using Hydrus-1D for the loam soil suggested that plant uptake was an important mechanism of dissipation.  相似文献   

Rater Agreement on Gait Assessment during Neurologic Examination of Horses     

E. Olsen  B. Dunkel  W.H.J. Barker  E.J.T. Finding  J.D. Perkins  T.H. Witte  L.J. Yates  P.H. Andersen  K. Baiker  R.J. Piercy 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2014,28(2):630-638

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Influence of Temperament Score and Handling Facility on Stress,Reproductive Hormone Concentrations,and Fixed Time AI Pregnancy Rates in Beef Heifers     

R Kasimanickam  S Schroeder  M Assay  V Kasimanickam  DA Moore  JM Gay  WD Whittier 《Reproduction in domestic animals》2014,49(5):775-782

The objectives were (i) to evaluate the effect of temperament, determined by modified 2‐point chute exit and gait score, on artificial insemination (AI) pregnancy rates in beef heifers following fixed time AI and (ii) to determine the effect of temperament on cortisol, substance‐P, prolactin and progesterone at initiation of synchronization and at the time of AI. Angus beef heifers (n = 967) at eight locations were included in this study. At the initiation of synchronization (Day 0 = initiation of synchronization), all heifers received a body condition score (BCS), and temperament score (0 = calm; slow exit and walk or 1 = excitable; fast exit or jump or trot or run). Blood samples were collected from a sub‐population of heifers (n = 86) at both synchronization initiation and the time of AI to determine the differences in serum progesterone, cortisol, prolactin and substance‐P concentrations between temperament groups. Heifers were synchronized with 5‐day CO‐Synch+ controlled internal drug release (CIDR) protocol and were inseminated at 56 h after CIDR removal. Heifers were examined for pregnancy by ultrasound 70 days after AI to determine AI pregnancy. Controlling for synchronization treatment (p = 0.03), facility design (p = 0.05), and cattle handling facility design by temperament score interaction (p = 0.02), the AI pregnancy differed between heifers with excitable and calm temperament (51.9% vs 60.3%; p = 0.01). The alley‐way with acute bends and turns, and long straight alley‐way had lower AI pregnancy rate than did the semicircular alley‐way (53.5%, 56.3% and 67.0% respectively; p = 0.05). The serum hormone concentrations differed significantly between different types of cattle handling facility (p < 0.05). The cattle handling facility design by temperament group interactions significantly influenced progesterone (p = 0.01), cortisol (p = 0.01), prolactin (p = 0.02) and substance‐P (p = 0.04) both at the initiation of synchronization and at the time of AI. Inter‐ and intra‐rater agreement for temperament scoring were moderate and good (Kappa = 0.596 ± 0.07 and 0.797 ± 0.11) respectively. The predictive value for calm and pregnant to AI was 0.87, and excited and non‐pregnant to AI was 0.76. In conclusion, the modified 2‐point temperament scoring method can be used to identify heifers with excitable temperament. Heifers with excitable temperament had lower AI pregnancy. Further, cattle handling facility design influenced the temperament and AI pregnancy.  相似文献