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   30293篇
  免费   1282篇
  国内免费   8篇
林业   1070篇
农学   892篇
基础科学   174篇
  4561篇
综合类   3980篇
农作物   1165篇
水产渔业   1146篇
畜牧兽医   16481篇
园艺   335篇
植物保护   1779篇
  2021年   224篇
  2020年   265篇
  2019年   331篇
  2018年   600篇
  2017年   664篇
  2016年   566篇
  2015年   364篇
  2014年   552篇
  2013年   1662篇
  2012年   863篇
  2011年   1114篇
  2010年   808篇
  2009年   761篇
  2008年   1077篇
  2007年   1053篇
  2006年   890篇
  2005年   713篇
  2004年   721篇
  2003年   661篇
  2002年   584篇
  2001年   744篇
  2000年   743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   344篇
  1987年   353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
41.
42.
43.
44.
In April 2003, persistent scouring and ill-thrift that was reported in calves form an intensive beef rearing operation in central Argentina despite treatments with benzimidazole and ivermectin. In order to conduct a controlled faecal egg count reduction test on this herd, 40 calves 5-8-months-old were selected on the basis that they had a nematode eggs per gram (epg) of faeces count greater than 150. Animals were divided into four groups (1-4) of 10 calves. Calves of groups 1-3 were treated, respectively, with subcutaneous injection of ivermectin (200 mcg/kg), ricobendazole (4 mg/kg) and levamisole (7.5 mg/kg), while calves of group 4 remained as untreated controls. The egg count reductions carried out 10 days later were lower than 15% in calves treated with ivermectin and ricobendazole, but 100% in animals receiving levamisole. Pooled post-treatment faecal cultures showed larval percentages of 92 and 95 for Haemonchus and 8 and 5 for Cooperia in the faeces of calves treated with ivermectin and ricobendazole, respectively. This is the first reported case of Haemonchus parasiting cattle showing simultaneous resistance to avermectins and benzimidazole type anthelmintics.  相似文献   
45.
The objective of this study was to evaluate the quality of published literature on reproduction in dogs. A systematic search in online databases revealed 287 papers that met the inclusion criteria. For evaluation a questionnaire comprising 40 criteria regarding materials and methodology, study design, statistics, presentation and information content, applicability and conclusions was developed. In a pre‐test including seven independent scientists the applicability and explanatory power of the questionnaire and its results were validated. Out of 287 publications evaluated, 90 (31.4%) were classified as clinical trials. The remaining 197 publications were case reports or contained information based on personal experience. Not a single meta‐analysis was found. Sixty (66.7%) of the 90 clinical trials included a control group. Randomization was conducted in 23 and blinding in eight articles respectively. In total five articles were determined as randomized, controlled and blinded clinical trials. Information content of the publications was variable concerning details on included animals, type or dosage of used remedies or conducted interventions. For example, in 99.7% of the articles, the exact number of animals was given, but in 79.8%, housing and feeding of the animals were not described. Statistical procedures of clinical trials were determined adequate in 55.6%. However, the data of 67.9% of the articles were evaluated to be not sufficient to draw valid conclusions. This study revealed evidence of deficits in the field of canine reproduction. The demand for more high quality clinical research is obvious. Requisite for the further implementation of the evidence‐based veterinary medicine is an improvement of the quantity and the quality of well‐designed, conducted and reported clinical trials. The practitioner should always assess the quality of information before implementing results into practice to provide best available care for the animals.  相似文献   
46.
47.
48.
Methods used to prepare antigens from caprine syncytial retrovirus (CSR) for use in the agarose gel immunodiffusion test (AGID) or an indirect enzyme-linked immunosorbent assay (ELISA) are described. Caprine and ovine sera were tested for antibody to CSR using the AGID test and ELISA incorporating a caprine system (CSR antigen and rabbit anti-goat IgG) or an ovine system (maedi-visna virus antigen and rabbit anti-sheep IgG). Good correlation was achieved in the results of the 3 tests when sera were devoid of antibody or were strongly positive. Variations in the results on weakly positive sera were considered to be more a matter of interpretation than due to basic differences in the reagents employed.  相似文献   
49.
50.
Twelve anestrous adult Greyhound bitches were used to study a regimen for induction of estrus. Once daily, 7 bitches were given diethylstilbestrol (DES; 5 mg, PO) until sanguineous vaginal discharge and vulvar edema were observed (designated as day 1 of proestrus) and for 2 days thereafter. If no response was elicited after 7 days, a doubled DES dose was given for up to an additional 7 days. Luteinizing hormone (5 mg, IM) was given on day 5 of proestrus, and follicle-stimulating hormone (10 mg, IM) was given on days 9 and 11 of proestrus. Bitches were bred once on day 13. Five bitches were used as a control group; they were given candy tablets for 7 days (first day on tablets, treatment day 1) and 0.9% NaCl (1.0 ml, IM) on treatment days 12, 16, and 18. The 7 bitches treated with DES had a mean proestrus period of 7.7 days and a mean estrus period of 5.7 days up to the day of mating. After mating, they had a mean gestation interval of 64 days and delivered a mean of 4 pups/litter. In 5 bitches, initial treatment with 5 mg of DES/day induced proestrus within 7 days; however, in 2 bitches, additional treatment with 10 mg of DES/day was needed for 5 and 6 days, respectively. Serum estradiol-17 beta and progesterone concentrations remained at base line during the period of DES treatment. Concentrations of both hormones increased after injection with luteinizing hormone and remained high for the next 4 days.(ABSTRACT TRUNCATED AT 250 WORDS)  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