RADIOGRAPHIC DIAGNOSIS: INTRAMEDULLARY EXTRUSION OF AN INTERVERTEBRAL DISC     

Julius M.  Liptak  BVSc  MvetClinstud  MACVSc  Graeme S.  Allan  MVSc  FACVSc  Mark B.  Krockenberger  BSc  BVSc  Phillip E.  Davis  MVSc  Richard  Malik  BVSc  MvetClinStud  PhD  FACVSc 《Veterinary radiology & ultrasound》2002,43(3):272-274

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猪轮状病毒2型(PCV2)是潜在的“定时炸弹”吗?     

Gordon Allan  Steve Krakowka  John Ellis  王洪戈 《中国牧业通讯》2003,(20):57-58

对猪轮状病毒2型(PCV2)的研究,为全球探讨断奶后多系统消瘦综合征(PMWS)的特殊问题,提供了许多答案。但是本文提出了一些还需要特别注意的地方 ,用以避免其可能导致的“恶果”出现。过去几年里 ,在关于断奶后多系统消瘦综合征(PMWS)、猪轮状病毒病(PCVD )全球性的探讨中 ,已经对许多关于疾病流行特点的来源和特征进行了广泛的研究。猪血清中猪轮状病毒2型 (PCV2)抗体以及猪的组织样本的检测表明 ,至少从1969年起 ,猪轮状病毒2型 (PCV2)的抗体就已经存在于猪的群体中了。现在已经确定 ,从1986年起在西班牙和英国就发现了传统的PMWS…  相似文献   

Ⅱ型猪环状病毒是断奶后全身消耗性综合征的致病因子     

袁森泉  覃矜  G.Allan 《国外畜牧学(猪与禽)》2001,(6):50-51

Ⅱ型猪环状病毒 (PCV2 )现已被证明是断奶后全身消耗性综合征 (PMWS)的致病因子 ,这一综合征是一种可造成世界各地严重经济损失的猪病。最近的研究还证实此病毒与加拿大和欧洲猪群的繁殖障碍有关。但是 ,绝大多数PCV2感染都是亚临床性的。刺激仔猪免疫系统是感染此病毒后产生临床疾病的重要因子吗 ?  相似文献   

Ⅱ型猪圆环病毒--滴答作响的定时炸弹?     

Gordon Allan  Steven Krakowka  John Ellis  李希林 《国外畜牧学(猪与禽)》2003,23(2):47-49

对Ⅱ型猪圆环病毒的研究为与猪断奶后多系统消耗性综合征在全球爆发有关的问题提供了大量答案,但还有一些方面迫切需要引起人们的关注,以便为可能出现的梦魇般的前景准备对策.  相似文献   

The effectiveness of benzimidazole-levamisole combination drenches in the presence of resistance to both benzimidazole and levamisole anthelmintics in New Zealand sheep     

McKenna PB  Allan CM  Taylor MJ 《New Zealand veterinary journal》1996,44(3):116-118

Examination of 25 cases of multiple benzimidazole and levamisole resistance, identified in sheep by faecal egg count reduction testing at the Batchelar, Lincoln and Invermay Animal Health Laboratories, showed that benzimidazole-levamisole combinations provided effective control in eight (47%) of 17 cases in which they were tested. Overall, the use of combination drenches resulted in average improvements in faecal egg count reductions of 25.6% (p<0.01) and 23.2% (p<0.05), respectively, over those achieved by the use of benzimidazole or levamisole drenches alone. The results suggest that instances of multiple resistance in which combination drenches might be effective are unlikely to be predictable either by identification of the parasites involved, or from the levels of benzimidazole or levamisole resistance present.  相似文献   

Some characteristics of a natural infection by parainfluenza-3 virus in a group of calves.     

E M Allan  H M Pirie  I E Selman  D R Snodgrass 《Research in veterinary science》1978,24(3):339-346

Parainfluenza-3 (Pi3) virus infection in a group of 25 calves is described. The virus was isolated from the lungs of four calve at days 6, 7, 13 and 55 after they were housed together at birth. Intracytoplasmic inclusion bodies were seen by light microscopy in bronchial and bronchiolar epithelial cells of two of these calves. Virus infected cells were detected by electron microscopy in three of the four calves. Haemagglutination inhibition antibodies to Pi3 virus were found in the sera of the calves. Despite the virus being present in the group from one week, a significant increase in antibody titre was found in only two animals although all the calves were in contact with each other during the study period. The pulmonary lesions in the four infected calves consisted of a bronchitis and bronchiolitis with infiltration of the walls and lumena of these structures by neutrophils and an adjacent neutrophil infiltration of alveoli some of which were collapsed.  相似文献   

Tolerance breaking by lymphocyte activating factor induced by Escherichia coli O138 lipopolysaccharide from homologous macrophages.     

D Allan  P Jenkins  F I Crampton 《Research in veterinary science》1978,25(2):188-192

Following an antigenic dose of 10 microgram or a tolerogenic dose of 200 microgram of Escherichia coli O138 lipopolysaccharide (LPS), BALB/c mice were examined on day 14 for percentages of theta-bearing cells. A considerable increase in T cells was noticed in lymphocytes from tolerant draining lymph nodes, and furthermore these cells did not possess receptors for LPS when tested for rosette inhibition. However, when the supernatant from 1 X 10(7) macrophages, pretreated with 150 microgram LPS, was given to tolerant mice on day 7, by day 14 tolerance was found to be broken, anti-LPS IgG was present in circulation and the draining lymph node contained T cells specifically committed to LPS. The change from suppressor to helper T cell activity is discussed in relation to enhancement of the immune response.  相似文献   

Announcement     

Allan Walker 《Weed Research》2002,42(6):415-415

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West Nile virus infection in free-ranging squirrels in Illinois.     

Kathleen M Heinz-Taheny  John J Andrews  Michael J Kinsel  Allan P Pessier  Marie E Pinkerton  Karin Y Lemberger  Robert J Novak  George J Dizikes  Eric Edwards  Nicholas Komar 《Journal of veterinary diagnostic investigation》2004,16(3):186-190

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Drivers,challenges and opportunities of forage technology adoption by smallholder cattle households in Cambodia     

K Ashley  S Wilson  JR Young  HP Chan  S Vitou  S Suon  PA Windsor  RD Bush 《Tropical animal health and production》2018,50(1):63-73

Forage technology has been successfully introduced into smallholder cattle systems in Cambodia as an alternative feed source to the traditional rice straw and native pastures, improving animal nutrition and reducing labour requirements of feeding cattle. Previous research has highlighted the positive impacts of forage technology including improved growth rates of cattle and household time savings. However, further research is required to understand the drivers, challenges and opportunities of forage technology for smallholder cattle households in Cambodia to facilitate widespread adoption and identify areas for further improvement. A survey of forage-growing households (n = 40) in July–September 2016 examined forage technology adoption experiences, including reasons for forage establishment, use of inputs and labour requirements of forage plot maintenance and use of forages (feeding, fattening, sale of grass or seedlings and silage). Time savings was reported as the main driver of forage adoption with household members spending approximately 1 h per day maintaining forages and feeding it to cattle. Water availability was reported as the main challenge to this activity. A small number of households also reported lack of labour, lack of fencing, competition from natural grasses, cost of irrigation and lack of experience as challenges to forage growing. Cattle fattening and sale of cut forage grass and seedlings was not found to be a widespread activity by interviewed households, with 25 and 10% of households reporting use of forages for these activities, respectively. Currently, opportunities exist for these households to better utilise forages through expansion of forage plots and cattle activities, although assistance is required to support these households in addressing current constraints, particularly availability of water, if the sustainability of this feed technology for smallholder cattle household is to be established in Cambodia.  相似文献