首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   30715篇
  免费   1288篇
  国内免费   8篇
林业   1094篇
农学   896篇
基础科学   174篇
  4643篇
综合类   3997篇
农作物   1169篇
水产渔业   1155篇
畜牧兽医   16683篇
园艺   340篇
植物保护   1860篇
  2021年   229篇
  2020年   269篇
  2019年   333篇
  2018年   603篇
  2017年   664篇
  2016年   572篇
  2015年   365篇
  2014年   557篇
  2013年   1666篇
  2012年   898篇
  2011年   1160篇
  2010年   815篇
  2009年   767篇
  2008年   1120篇
  2007年   1095篇
  2006年   944篇
  2005年   757篇
  2004年   755篇
  2003年   691篇
  2002年   616篇
  2001年   752篇
  2000年   755篇
  1999年   544篇
  1998年   244篇
  1997年   227篇
  1995年   269篇
  1992年   400篇
  1991年   415篇
  1990年   432篇
  1989年   440篇
  1988年   345篇
  1987年   354篇
  1986年   383篇
  1985年   342篇
  1984年   331篇
  1983年   303篇
  1979年   481篇
  1978年   328篇
  1977年   370篇
  1976年   468篇
  1975年   485篇
  1974年   523篇
  1973年   480篇
  1972年   438篇
  1971年   354篇
  1970年   372篇
  1969年   434篇
  1968年   441篇
  1967年   446篇
  1966年   438篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
Abstract

Extract

Rural veterinary practice faces difficulties in many parts of the world. Falling farm incomes and increasing costs have sometimes resulted in reduced use of veterinary services. There seems to be widespread agreement that an increased emphasis on preventive medicine would improve the situation for both the farmer and his veterinarian. There appear to be no commonly agreed formal criteria for the development and evaluation of health programmes, either in human or veterinary medicine, but increasing attention is being paid to the problem(1) Anon Statistical indicators for the planning and evaluation of public health programmes: 11th report of the World Health Organisations expert committee on health statistics W. H. O. Tech. Reports No. 365 1971  [Google Scholar] (12) Morris, R. S. 1969. Assessing the ecnomic value of veterinary services to primary industries. Aust. vet. J., 45: 295300.  [Google Scholar] (14) Morris, R. S. 1975. Criteria for the design and evaluation of bovine mastitis control systems. International Dairy Federation Proceedings, 85: 395409. In [Google Scholar] (15) Schulberg, H. C., Sheldon, A. and Baker, F., eds. 1970. Program evaluation in the health fields, N.Y.: Behavioural Publications.  [Google Scholar], In some ways the evaluation of animal health programmes should be the easier, for there are fewer ethical problems and economic criteria are of paramount importance in rural practice.  相似文献   
53.
Extract

I have taken as my subject for this address the topic, “Change”, and will deal with two aspects of change, one the challenge of change due to new knowledge and techniques and second the change we must make in our attitude to other agricultural disciplines and ancillary veterinary personnel.  相似文献   
54.
55.
56.
Extract

Scouring syndromes constitute a major disease group in dairy calves in New Zealand.  相似文献   
57.
Extract

Mange in pigs caused by Sarcoptes scabiei var. suis is reported to be common in New Zealand, but, to the writer's knowledge, no investigation has been made of the number of infested farms in any area.  相似文献   
58.
OBJECTIVE: To evaluate semiquantitative and quantitative assays for microalbuminuria and determination of the urine albumin-creatinine (UAC) ratio in detection of systemic disease in dogs without overt proteinuria. DESIGN: Prospective study. ANIMALS: 408 dogs. PROCEDURES: Urine samples that had been obtained from dogs for which a complete medical record was available and in which results of a dipstick test for urine protein were negative were evaluated. Urine protein-creatinine ratios (cutoff values, 0.5 and 0.1), semiquantitative and quantitative microalbuminuria values (cutoff value, 1 mg/dL), and UAC ratios (cutoff values, 100 and 200 mg/g) were determined. Clinical diagnoses rendered within 3 months of enrollment in the study were recorded. Sensitivity and specificity were determined with disease status serving as the standard. Associations with clinical diagnosis, sex, age, BUN and serum creatinine concentrations, blood pressure, results of bacterial culture of urine, temperature, pyuria, hematuria, and bacteriuria were evaluated by use of logistic regression analysis. RESULTS: 48 dogs were healthy, and 360 had at least 1 disease. Significant associations were detected between age, presence of disease, presence of neoplastic disease, BUN and serum creatinine concentrations, and hematuria and results of 1 or both of the microalbuminuria assays. CONCLUSIONS AND CLINICAL RELEVANCE: Microalbuminuria was associated with underlying disease. The sensitivity and specificity of the semiquantitative microalbuminuria test for detection of systemic disease were superior to those of other tests. Microalbuminuria testing in conjunction with other screening procedures may increase diagnosis of subclinical disease, but a prospective study in which the predictive values of screening tests are evaluated, with and without microalbuminuria determination, is needed.  相似文献   
59.
A 6-year-old multiparous Holstein cow was admitted for evaluation of progressive milk flow obstruction of one quarter of the udder. Physical examination findings suggested the presence of a mural teat abscess. Ultrasonography substantiated the physical examination findings and delineated the extent of the lesion. Surgical excision of the abscess en bloc yielded satisfactory functional and cosmetic results.  相似文献   
60.
全球禽肉生产和贸易中的沙门菌风险评估与控制   总被引:1,自引:0,他引:1  
1 禽源沙门菌对公共卫生的影响 在许多国家,沙门菌仍是引发食源性肠道疾病的主要原因.沙门菌通常存在于家畜、家禽中,也可在啮齿类、爬行类和鸟类等野生动物中发现.当农场的禽群感染沙门菌后,通常会有一部分家禽的消化道中携带沙门菌,但并无症状.随后,沙门菌可能会通过粪便污染感染动物屠体.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号