全文获取类型
收费全文 | 279篇 |
免费 | 8篇 |
专业分类
林业 | 14篇 |
农学 | 4篇 |
15篇 | |
综合类 | 48篇 |
农作物 | 15篇 |
水产渔业 | 6篇 |
畜牧兽医 | 181篇 |
园艺 | 2篇 |
植物保护 | 2篇 |
出版年
2023年 | 5篇 |
2021年 | 4篇 |
2020年 | 3篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 4篇 |
2015年 | 2篇 |
2014年 | 7篇 |
2013年 | 6篇 |
2012年 | 7篇 |
2011年 | 2篇 |
2010年 | 4篇 |
2009年 | 3篇 |
2008年 | 2篇 |
2007年 | 6篇 |
2006年 | 8篇 |
2005年 | 4篇 |
2004年 | 6篇 |
2003年 | 5篇 |
2002年 | 12篇 |
2001年 | 7篇 |
2000年 | 7篇 |
1999年 | 11篇 |
1998年 | 20篇 |
1997年 | 21篇 |
1996年 | 16篇 |
1995年 | 12篇 |
1994年 | 6篇 |
1993年 | 10篇 |
1992年 | 5篇 |
1991年 | 10篇 |
1990年 | 13篇 |
1989年 | 13篇 |
1988年 | 7篇 |
1987年 | 2篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1980年 | 2篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1976年 | 3篇 |
1975年 | 1篇 |
1973年 | 2篇 |
1972年 | 3篇 |
1969年 | 1篇 |
1968年 | 1篇 |
1943年 | 1篇 |
1941年 | 1篇 |
1933年 | 1篇 |
排序方式: 共有287条查询结果,搜索用时 62 毫秒
91.
JT SEAMAN WS TURVEY SJ OTTAWAY AR GILMOUR RJ DIXON† 《Australian veterinary journal》1989,66(9):279-285
A field grazing trial was undertaken to monitor the health and production of crossbred sheep grazing pasture where Echium plantagineum constituted a considerable proportion of the available forage. The trial, conducted for 19 months over successive grazing seasons, demonstrated a significant difference in production, with sheep on the E. plantagineum pasture being lighter and growing less wool compared with sheep on Echium-free pasture. No mortalities involving pyrrolizidine alkaloid poisoning were recorded in sheep grazing E. plantagineum, although there was histological evidence of moderately severe liver damage associated with high liver copper concentrations in at least one sheep following the grazing of large quantities of the plant. 相似文献
92.
93.
94.
Premature farrowings caused by feeding cottonseed meal 总被引:1,自引:0,他引:1
Increasing the level of cottonseed meal (CSM) in sow diets from less than 5% to 10% increased the incidence of premature farrowings (gestation length less than 111 days) from 1.1% to 2.7% (p less than 0.001) and reduced the mean gestation length from 114.07 +/- 1.53 to 113.70 +/- 1.59 days (p less than 0.0001). Survival of piglets born prematurely was poor. After removal of CSM from the diet there was a residual effect lasting several weeks before the gestation length returned to normal. Experimental feeding of diets containing 20% and 40% CSM to small groups of sows caused significant shortening of gestation length and 3 of 26 sows fed 40% CSM farrowed prematurely. The mechanism by which CSM causes this effect has yet to be determined. 相似文献
95.
C. M. Skelly H. McAllister W. J. C. Donnelly 《The Journal of small animal practice》1997,38(10):445-449
Avulslon of the tibial tuberosity was dlagnosed In six of seven greyhound ilttermates aged flve and a half months. The puppies showed hindlimb lameness of varying severity. Radiological assessment of affected stifle joints revealed partial or complete avulsion of the tlblal tuberoslties. In four puppies the lesions were bliaterai. Euthanasia of the two most severely affected puppies performed; the changes observed on histopathological examination of their cranioproximal tibiae suggested that the underlying lesion was that of osteochondrosis. A heredltary predisposition In greyhounds to osteochondrosis of the physis between the apophysis and the cranioproximal tibia1 dlaphysis Is postulated. 相似文献
96.
97.
98.
Photosensitisation and crystal-associated cholangiohepatopathy in sheep grazing Brachiaria decumbens
Two outbreaks of photosensitivity and jaundice in sheep grazing the grass, Brachiaria decumbens. In West Java in 1983 and 1983 and 1990 are described. Aggregates of acicular clefts and crystals were present in bile canaliculi, bile ducts, Kupffer cells, hepatocytes and in kidney tubules. The number of crystals increased with the length of exposure to the plant and sheep that died had the largest accumulations. These crystalline structures have been reported before in this syndrome, but are similar to those seen in Tribulus terrestris and Panicum spp toxicities. 相似文献
99.
Donnelly RJ 《Science (New York, N.Y.)》1996,271(5252):1039b-1040b
100.