库大小对水稻不同叶位叶片氮代谢的影响   总被引：3，自引：0，他引：3  

王绍华  曹卫星  丁艳锋  刘胜环 《作物学报》2004,30(8):821-825

采用去穗与疏花方式调节库大小，研究了对水稻不同叶位叶片氮代谢的影响。去穗或疏花后，已完成发育的源叶片，尤其是顶4叶，蛋白质合成重新旺盛，蛋白氮含量提高，出现了类似于生长库的氮代谢特征。水稻叶片的酸性转化酶活力可反映其蛋白质合成能力，据此可判断叶片是属于氮素供应源还是氮素接受库。研究证实下位叶的氮代谢  相似文献   

Amplification of acidic protease virulence gene (aprV2) in samples from footrot lesions did not help in diagnosis of clinical virulent footrot in affected sheep flocks in New South Wales     

AM Collins  BG Bowring 《Australian veterinary journal》2020,98(7):298-304

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Incidence of presenting complaints and diagnoses in insured Australian dogs     

S Wolf  J Selinger  MP Ward  P Santos-Smith  M Awad  A Fawcett 《Australian veterinary journal》2020,98(7):326-332

Knowledge of the most common presenting complaints and diagnoses in companion animals is valuable in preparing veterinary students and veterinarians to manage the most frequently observed conditions in clinical practice. Pet insurance databases provide access to large sample populations and have been previously used to describe disease incidence in companion animals. The aim of this study was to determine the incidence of presenting complaints and diagnoses in insured Australian dogs through the use of a pet insurance database. Analysis of a de-identified dataset containing pet insurance claims associated with presenting complaints and diagnoses from 488,472 insured Australian dogs insured in the years 2016 and 2017, was performed. Annual incidence rates of presenting complaints and diagnoses were calculated and expressed as, number of events per 1,000 dog years at risk. The presenting complaints with the highest incidence were vomiting (14.21 events per 1,000 dog years at risk in 2016, 15.80 events per 1,000 dog years at risk in 2017) and pruritus (8.79 events per 1,000 dog years at risk in 2016, 10.30 events per 1,000 dog years at risk in 2017). Presenting complaints affecting the gastrointestinal system were the most common (19.20 events per 1,000 dog years at risk in 2016, 20.77 events per 1,000 dog years at risk in 2017). The diagnoses with the highest incidence were otitis externa (34.12 events per 1,000 dog years at risk in 2016, 34.82 events per 1,000 dog years at risk in 2017) and dermatitis (28.05 events per 1,000 dog years at risk in 2016, 29.99 events per 1,000 dog years at risk in 2017). Diagnoses affecting the integument were the most common (216.56 events per 1,000 dog years at risk in 2016, 219.06 events per 1,000 dog years at risk in 2017). The results from this study can aid in the design of relevant veterinary curricula and may be helpful in prioritising research on common clinical conditions.  相似文献   

Canonical correlative analyses among an enzyme-linked immunosorbent assay using synthetic peptides,an indirect fluorescent antibody test,and hematologic measurements in dogs infected with Ehrlichia canis     

Isis I. G. G. Taques  Maíra F. G. Koiyama  Amanda N. S. Campos  Jackeliny S. Costa  Kuang Hongyu  Daniel M. Aguiar 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》2020,49(4):574-582

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Novel findings from a beta coronavirus outbreak on an American Miniature Horse breeding farm in upstate New York     

E. L. Goodrich  L. D. Mittel  A. Glaser  S. L. Ness  R. M. Radcliffe  T. J. Divers 《Equine Veterinary Education》2020,32(3):150-154

This case report describes an outbreak and novel findings associated with a beta coronavirus (BCoV) infection that occurred on an American Miniature Horse (AMH) breeding farm in upstate New York, in January and February of 2013. Twenty-nine AMH and one donkey were present on the farm when the outbreak occurred. One 10-year-old Quarter Horse mare, stabled at a separate location and owned by an employee of the farm, also tested positive. A polymerase chain reaction (PCR) assay for the detection of BCoV was performed at the Animal Health Diagnostic Center (AHDC) at Cornell on all faecal samples. The PCR assay used detects multiple beta coronaviruses, including, but not limited to, equine enteric coronavirus (ECoV). Novel findings regarding this BCoV infection in horses were recognised in this outbreak study. To the authors’ knowledge, this is the largest outbreak of BCoV described thus far in a closed herd on a single premise. The case fatality rate was 0% unlike that described in a previous outbreak of ECoV involving miniature horses and a miniature donkey (Fielding et al. 2015). The morbidity rate was lower in this outbreak than in previously described studies (Oue et al. 2013; Pusterla et al. 2013). This outbreak also demonstrated the potential for BCoV transmission via farm personnel. The duration of shedding of virus in the faeces among some asymptomatic horses in this outbreak was longer than previously described clinical cases of ECoV (Pusterla et al. 2013; Nemoto et al. 2014). This study suggests that asymptomatic animals may play a role in the maintenance of BCoV during an outbreak; therefore, the need for diagnostic testing of both clinically affected and apparently clinically normal horses on a premises followed by appropriate biosecurity and control measures.  相似文献   

引起牛呼吸道症状疾病的病原的鉴别诊断与防制          下载免费PDF全文

朱克林  张震宇  刘洪 《中国牛业科学》2020,46(1):93-96

牛呼吸道症状疾病在牛场中十分高发且危害严重,在我国,根据调查发现在养牛业中65%牛疾病是感染牛呼吸系统病~([1])。本文对一些能引起呼吸道症状的病原进行了一个梳理,希望能给广大养牛户和基层兽医工作者在疫病防控方面一些中帮助。  相似文献   

多用快换刀架的设计     

陈亚立  许腊信 《安徽农业大学学报》1995,22(3):297-299

文章介绍了多功能工具机快换刀架的结构组成和设计原理。使用结果说明,本刀轲构思巧妙、设计新颖、结构简单、使用安全、性能良好。  相似文献   

犬猫冠状病毒研究进展     

李少晗  张广智  崔尚金  秦彤 《中国畜牧兽医》2020,47(12):4059-4068

犬冠状病毒（canine coronavirus,CCoV）与猫冠状病毒（feline coronavirus,FCoV）同属于冠状病毒科冠状病毒属α属,与其同属的病毒还有猪传染性胃肠炎病毒（porcine transmissible gastroenteritis virus,TGEV）、猪流行性腹泻病毒（porcine epidemic diarrhea virus,PEDV）等。遗传进化分析表明,该种属不同基因型病毒通过基因重组能产生新型变异毒株,为疾病的诊断与防控造成了很大的阻碍。β属冠状病毒包括牛冠状病毒（bovine coronavirus,BCoV）、犬呼吸道冠状病毒（canine respiratory coronavirus,CRCoV）、严重急性呼吸综合征冠状病毒（severe acute respiratory syndrome coronavirus,SARS-CoV）等,其中CRCoV与BCoV同源性较高,该类病毒与α属冠状病毒在基因组结构、致病机制、感染症状等方面差异较大。CCoV与FCoV在全球范围内广泛传播,具有发病率高、死亡率低的特点。由于RNA病毒本身的特点和环境选择压力的影响,这两种病毒不断变异进化,新的强致病力毒株相继出现。经FCoV基因突变演化而来的猫传染性腹膜炎病毒（feline infectious peritonitis virus,FIPV）毒力大大增强,病毒基因组中某些特异性的点突变使得针对宿主的细胞嗜性发生改变,该病毒的致病机制主要依赖于病毒感染后诱导机体产生的抗体依赖性增强作用（ADE）。针对犬猫冠状病毒的流行病学调查及防控不能仅依赖于疫苗免疫单一因素,还应综合考虑病毒毒力、环境条件、宠物自身免疫抵抗力状态等。针对犬猫冠状病毒的诊断应根据临床症状,结合常规血液学检查、血清生化检查和实验室诊断技术来进行全面的鉴定,防止出现假阳性及假阴性结果。  相似文献   

西尼罗病毒研究进展   总被引：1，自引：0，他引：1  

常华  花群义  项勋  曾昭文  段纲 《云南农业大学学报(自然科学版)》2006,21(1):76-80

 在最近20年以来西尼罗病毒不断感染人畜,导致相关西尼罗河疾病暴发流行,给人类带来危害并造成畜牧业严重的经济损失。通过对西尼罗病毒的病原学、流行特征、临床表现、诊断以及疫苗的研究进行概括,为进一步了解和研究该病毒提供依据。  相似文献   

农户饲养母牛生产瘫痪的诊治          下载免费PDF全文

汤天元  李强  朱跃明 《中国牛业科学》2019,45(2):91-93

生产瘫痪是产后母畜突然发生严重的钙代谢障碍性疾病,该病多发生于营养良好5～9岁的高产乳牛,肉用及肉乳兼用型母牛也有发生,给养殖场户造成较大损失,作者通过防控知识宣传、早发现、早治疗、静脉内大剂量钙制剂和向乳房内打入空气等方法,收效好,治愈率高,深受广大养殖户好评。  相似文献