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   251篇
  免费   13篇
林业   3篇
基础科学   2篇
  6篇
综合类   30篇
水产渔业   16篇
畜牧兽医   194篇
园艺   1篇
植物保护   12篇
  2021年   2篇
  2020年   8篇
  2019年   4篇
  2018年   4篇
  2017年   3篇
  2016年   12篇
  2015年   4篇
  2014年   6篇
  2013年   20篇
  2011年   3篇
  2010年   9篇
  2009年   13篇
  2008年   8篇
  2007年   3篇
  2006年   5篇
  2005年   3篇
  2004年   4篇
  2002年   3篇
  2001年   5篇
  2000年   6篇
  1999年   8篇
  1998年   19篇
  1997年   12篇
  1996年   7篇
  1995年   5篇
  1994年   6篇
  1993年   8篇
  1992年   9篇
  1991年   9篇
  1990年   11篇
  1989年   10篇
  1988年   7篇
  1987年   1篇
  1986年   1篇
  1985年   1篇
  1984年   1篇
  1983年   1篇
  1982年   1篇
  1981年   1篇
  1979年   3篇
  1978年   1篇
  1976年   1篇
  1972年   1篇
  1971年   3篇
  1969年   1篇
  1968年   1篇
  1967年   2篇
  1966年   3篇
  1965年   2篇
  1937年   1篇
排序方式: 共有264条查询结果,搜索用时 15 毫秒
91.
92.
93.
Resistance of Fasciola hepatica to triclabendazole   总被引:1,自引:0,他引:1  
  相似文献   
94.
95.
SUMMARY The extent and causes of sheep losses in the semi-arid Mallee region of north-western Victoria were assessed by interviewing the owners of 79 randomly selected farms running 241 flocks in 1987/88 and 245 flocks in 1988/89. Mean annual losses were higher in ram flocks (21%) than in ewe flocks (7%), in flocks of non-Merino sheep (rams 24%, ewes 11%, weaners 5%) than in Merino (rams 11%, ewes 6%, wethers 4%, weaners 4%) and in ewe flocks 3 or more years old (10%) than in young ewe flocks (3.5%). In flocks where losses exceeded 5%, the causes most often reported by farmers were blowfly strike (especially in Merino sheep and weaners), ewe losses in autumn close to lambing, and heliotrope (Heliotropium europaeum) poisoning. Heliotrope poisoning was considered by the authors to be the main reason for the higher losses in old ewes than in young ewes and in non-Merino sheep than in Merino sheep. Losses of ewes associated with pregnancy and lambing were considered by the authors to be often predisposed by liver damage caused by heliotrope poisoning, and high losses in non-Merino ram flocks were attributed to both heliotrope poisoning and their ability to escape through boundary fences. Reasons for continuing high losses due to enterotoxaemia are discussed. Losses due to gastro-intestinal parasites, footrot and foot abscess were low.  相似文献   
96.
97.
Ivermectin and piperazine toxicoses in dogs and cats   总被引:1,自引:0,他引:1  
Review of all reports involving anthelmintics in dogs and cats to the IAPIC between January 1, 1986 and August 10, 1988, revealed that ivermectin (extra-label use) and piperazine accounted for over 50% of the calls assessed as toxicoses and suspected toxicoses. Both ivermectin and piperazine are gamma-aminobutyric acid (GABA) agonists and their major effects appear to be on the central nervous system. Ivermectin toxicoses at estimated doses of greater than or equal to 100-less than 500 micrograms/kg were reported more than once only in the collies (n = 25) and Australian shepherds (n = 10); these two breeds accounted for 46% (69 of 150) of the toxicoses and suspected toxicoses calls in dogs. Ataxia, behavioral disturbances, tremors, mydriasis, weakness/recumbency, apparent blindness, hypersalivation/drooling (dogs only), and coma were the most commonly reported clinical signs in dogs and cats with suspected ivermectin toxicoses. Shock, dyspnea, vomiting, and ataxia were the most common clinical signs attributed to the microfilaricidal activity of ivermectin. Piperazine was the anthelmintic with the greatest number of reports of toxicoses and suspected toxicoses in cats. Piperazine neurotoxicity in cats and dogs usually was manifested by muscle tremors, ataxia, and/or behavioral disturbances within 24 hours after estimated daily dose(s) between 20 and 110 mg/kg.  相似文献   
98.
99.
SUMMARY A multivalent footrot vaccine has been developed, containing pilus antigens produced in recombinant Pseudomonas aeruginosa and representing all nine serogroups of Dichelobacter (Bacteroides) nodosus commonly recognised in the field. The responses of sheep to the multivalent vaccine have been compared with those to monovalent vaccines representing only a single serogroup. Antigenie competition between serogroups occurred in sheep immunised with the multivalent formulation, but high levels of protection were still achieved. The study showed that in multivalent footrot vaccines, antigenic competition is predominantly due to the presence of a family of immunologically-related pilus antigens rather than to interference by extraneous proteins.  相似文献   
100.
Summary Australian native and introduced plants were examined, using digoxin immunoassays, to detect the presence of cross-reacting cardiac glycosides. These compounds were found in 27 species from 20 genera. The assay technique can also be used on serum samples to confirm cardiac glycoside ingestion.  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