全文获取类型
| 收费全文 | 441篇 |
| 免费 | 11篇 |
专业分类
| 林业 | 3篇 |
| 农学 | 25篇 |
| 基础科学 | 2篇 |
| 36篇 | |
| 综合类 | 91篇 |
| 农作物 | 73篇 |
| 水产渔业 | 21篇 |
| 畜牧兽医 | 184篇 |
| 园艺 | 4篇 |
| 植物保护 | 13篇 |
出版年
| 2021年 | 7篇 |
| 2020年 | 5篇 |
| 2017年 | 9篇 |
| 2016年 | 4篇 |
| 2014年 | 8篇 |
| 2013年 | 17篇 |
| 2012年 | 18篇 |
| 2011年 | 12篇 |
| 2009年 | 8篇 |
| 2008年 | 13篇 |
| 2007年 | 15篇 |
| 2006年 | 14篇 |
| 2005年 | 11篇 |
| 2004年 | 11篇 |
| 2003年 | 22篇 |
| 2002年 | 10篇 |
| 2001年 | 6篇 |
| 2000年 | 6篇 |
| 1999年 | 10篇 |
| 1997年 | 4篇 |
| 1996年 | 6篇 |
| 1995年 | 4篇 |
| 1994年 | 6篇 |
| 1993年 | 6篇 |
| 1992年 | 10篇 |
| 1991年 | 10篇 |
| 1990年 | 10篇 |
| 1989年 | 4篇 |
| 1988年 | 8篇 |
| 1987年 | 8篇 |
| 1985年 | 6篇 |
| 1984年 | 6篇 |
| 1983年 | 8篇 |
| 1982年 | 3篇 |
| 1981年 | 5篇 |
| 1980年 | 4篇 |
| 1979年 | 7篇 |
| 1978年 | 3篇 |
| 1977年 | 4篇 |
| 1974年 | 9篇 |
| 1973年 | 5篇 |
| 1972年 | 13篇 |
| 1971年 | 8篇 |
| 1970年 | 8篇 |
| 1969年 | 11篇 |
| 1968年 | 5篇 |
| 1967年 | 5篇 |
| 1966年 | 8篇 |
| 1964年 | 3篇 |
| 1905年 | 3篇 |
排序方式： 共有452条查询结果，搜索用时 31 毫秒
1.
G. C. W. England W. Edward Allen D. J. Porter 《The Journal of small animal practice》1989,30(8):441-443
A two-year-old dog was presented with no scrotal testes. There was no history of castration but at laparotomy no testes were found. To confirm that the dog was truly anorchid a human chorionic gonadotrophin stimulation test was performed. This was then validated in normal entire and castrated dogs. 相似文献
2.
3.
4.
The neonatal requirements for maternal passive immunity and the lactation immunobiology with regard to sow immunisation for neonatal protection are reviewed. A vaccination protocol which combines oral and parenteral antigen administration to produce antibody activity mediated mainly by IgM is described. Its efficacy in affording protection to neonatal piglets was tested against a lethal oral infection with a virulent strain of Escherichia coli "Abbottstown". Piglets suckled on vaccinated or non-vaccinated sows were exposed to an infective challenge in the gastrointestinal tract and the relative pathology in test and control groups observed over the neonatal period. Death ensued in 76 per cent of piglets suckled on control sows and 26 per cent of piglets suckled on sows vaccinated by two intramuscular injections. Litters suckled on orally vaccinated sows were able to resist a similar infective challenge, there being only one fatality out of 42 piglets. 相似文献
5.
6.
7.
8.
Oral immunisation with Escherichia coli polysaccharide antigens provided a primary antigenic stimulus which facilitated the production of humoral IgM antibody following a single parenteral antigen dose. The peak antibody response of preparturient sows was manipulated to coincide with the period of colostrum formation so that high levels of IgM antibody were made available for neonatal defence. The characteristics of the immune response remained unchanged on reintroduction of the immunisation schedule for a second gestation period. 相似文献
9.
10.
Jayden Robert Filipe Espinheira Gomes Ian Porter Julia P. Sumner 《The Canadian veterinary journal. La revue veterinaire canadienne》2021,62(1):27
A 12-year-old castrated male cocker spaniel dog was presented with a 4-week history of left episcleral injection and pawing at the face. Clinical examination findings included left internal and external ophthalmoplegia, left dorsal strabismus, pain opening the mouth, and intermittent amaurosis. Imaging studies revealed a left orbital apex mass with adjacent sphenoid bone lysis and extension into the cranial cavity. A left exenteration was performed and histopathology confirmed an orbital soft tissue sarcoma.Key clinical message:This report describes an orbital tumor causing orbital apex syndrome. This condition should be differentiated from cavernous sinus syndrome as the latter does not course with optic neuropathy. 相似文献