全文获取类型
| 收费全文 | 400篇 |
| 免费 | 31篇 |
专业分类
| 林业 | 5篇 |
| 农学 | 4篇 |
| 基础科学 | 1篇 |
| 29篇 | |
| 综合类 | 36篇 |
| 农作物 | 6篇 |
| 水产渔业 | 8篇 |
| 畜牧兽医 | 337篇 |
| 植物保护 | 5篇 |
出版年
| 2023年 | 2篇 |
| 2022年 | 2篇 |
| 2020年 | 10篇 |
| 2019年 | 6篇 |
| 2018年 | 9篇 |
| 2017年 | 7篇 |
| 2016年 | 7篇 |
| 2015年 | 9篇 |
| 2014年 | 17篇 |
| 2013年 | 17篇 |
| 2012年 | 13篇 |
| 2011年 | 11篇 |
| 2010年 | 14篇 |
| 2009年 | 12篇 |
| 2008年 | 22篇 |
| 2007年 | 13篇 |
| 2006年 | 23篇 |
| 2005年 | 16篇 |
| 2004年 | 12篇 |
| 2003年 | 10篇 |
| 2002年 | 10篇 |
| 2001年 | 15篇 |
| 2000年 | 5篇 |
| 1999年 | 11篇 |
| 1998年 | 14篇 |
| 1997年 | 5篇 |
| 1996年 | 5篇 |
| 1995年 | 4篇 |
| 1994年 | 2篇 |
| 1993年 | 4篇 |
| 1992年 | 14篇 |
| 1991年 | 15篇 |
| 1990年 | 10篇 |
| 1989年 | 11篇 |
| 1988年 | 7篇 |
| 1987年 | 10篇 |
| 1986年 | 10篇 |
| 1985年 | 12篇 |
| 1984年 | 7篇 |
| 1983年 | 2篇 |
| 1982年 | 2篇 |
| 1976年 | 2篇 |
| 1972年 | 2篇 |
| 1969年 | 1篇 |
| 1968年 | 2篇 |
| 1967年 | 2篇 |
| 1966年 | 3篇 |
| 1959年 | 1篇 |
| 1958年 | 1篇 |
| 1924年 | 1篇 |
排序方式： 共有431条查询结果，搜索用时 281 毫秒
91.
Herpes viral hepatitis in a toucan 总被引：1，自引：0，他引：1
Herpesvirus infection was diagnosed in a toucan. The herpesvirus was isolated from the liver and identified by electron microscopy in the liver and in cell culture. A negative immunofluorescent reaction was obtained when virus-infected cell cultures were reacted with a conjugate to the herpesvirus of Pacheco's disease. The main pathologic finding in the toucan consisted of a severe necrotizing hepatitis with intranuclear inclusions in the liver and spleen. A presumptive diagnosis of chlamydiosis was also made, based on a positive direct fluorescent monoclonal antibody reaction to chlamydial antigens in impression smears of liver and spleen. Chlamydial isolation attempts were unsuccessful. The toucan had been in contact with two macaws that had died 5 days before the toucan died and were diagnosed by histology as having herpesvirus hepatitis. 相似文献
92.
Newly hatched commercial turkey poults culled because of grossly visible cataracts were studied. A total of 43 affected and 23 unaffected control poults at various ages were necropsied, and the ocular changes in affected poults were compared with those of aged-matched controls. Affected poults had consistent cataracts coupled with a marked depletion in retinal inner plexiform, ganglion cell, and optic nerve fiber layers, with a resultant reduction in the size of the optic nerves. Lesions were seen in 1-day-old poults. Lens changes included microphakia and lens fiber degeneration throughout the lens, with nuclear liquefaction. The depletion in the numbers of retinal ganglion cells did not appear to progress over several weeks time. The ganglion cell depletion was not uniform within the retina. The cause for these ocular changes is unknown. 相似文献
93.
W M Barr 《The Veterinary record》1984,114(24):587-590
Examination of 1260 rams, involving 1540 semen examinations, revealed that 9 per cent of rams in hill flocks in Argyll were subfertile as assessed by semen evaluation. Although 34 lesions of the genitalia were identified, only 13 were associated with poor semen quality. A five year survey of one blackface flock resulted in the elimination, after three years, of a 17 per cent level of infertility following routine examination of all rams, with an increase of 2.27 per cent in the lamb crop. Based on the 1981 lamb prices for this flock an increased income of 1085 pounds was achieved. 相似文献
94.
95.
Two commercially available tests, an antigen-capture ELISA for use on fecal samples, and a peroral nylon string test for use in dogs, were compared with a zinc sulfate fecal concentration technique (ZSCT) for detection of giardiasis in dogs. Of 77 dogs and 164 fecal samples (from these dogs), 33 and 52, respectively were found to be Giardia-positive on the basis of results of the ZSCT. The ELISA gave false-negative results for 10 and 14% of ZSCT-positive dogs and fecal samples, respectively, and false-positive results (relative to the ZSCT test results) in 13 and 10% of ZSCT-positive dogs and fecal samples, respectively. Of the 18 string-tested dogs, 14 were positive by results of the ZSCT. Of the 4 dogs that were Giardia-negative by ZSCT, 2 were Giardia-positive by ELISA. Dogs were sedated and given water and metoclopramide to aid passage into the duodenum of the capsule containing a nylon string. Of the 21 string tests performed on the 18 dogs, only 5 strings reached the duodenum, and 0 of the 5 yielded positive results for Giardia sp. Because the string broke in 1 dog (leaving most in the gastrointestinal tract and, therefore, producing a risk of string foreign body) further string tests were not done. 相似文献
96.
97.
98.
99.
100.