全文获取类型
| 收费全文 | 419篇 |
| 免费 | 21篇 |
专业分类
| 林业 | 80篇 |
| 农学 | 17篇 |
| 87篇 | |
| 综合类 | 32篇 |
| 农作物 | 21篇 |
| 水产渔业 | 17篇 |
| 畜牧兽医 | 166篇 |
| 园艺 | 5篇 |
| 植物保护 | 15篇 |
出版年
| 2021年 | 2篇 |
| 2020年 | 6篇 |
| 2019年 | 12篇 |
| 2018年 | 12篇 |
| 2017年 | 10篇 |
| 2016年 | 8篇 |
| 2015年 | 7篇 |
| 2014年 | 11篇 |
| 2013年 | 38篇 |
| 2012年 | 13篇 |
| 2011年 | 13篇 |
| 2010年 | 14篇 |
| 2009年 | 15篇 |
| 2008年 | 7篇 |
| 2007年 | 14篇 |
| 2006年 | 19篇 |
| 2005年 | 16篇 |
| 2004年 | 18篇 |
| 2003年 | 14篇 |
| 2002年 | 17篇 |
| 2001年 | 18篇 |
| 2000年 | 9篇 |
| 1999年 | 14篇 |
| 1998年 | 17篇 |
| 1997年 | 16篇 |
| 1996年 | 13篇 |
| 1995年 | 6篇 |
| 1994年 | 8篇 |
| 1993年 | 7篇 |
| 1992年 | 5篇 |
| 1991年 | 4篇 |
| 1990年 | 3篇 |
| 1989年 | 5篇 |
| 1988年 | 3篇 |
| 1987年 | 4篇 |
| 1986年 | 4篇 |
| 1985年 | 9篇 |
| 1981年 | 2篇 |
| 1978年 | 2篇 |
| 1977年 | 2篇 |
| 1975年 | 1篇 |
| 1974年 | 2篇 |
| 1973年 | 2篇 |
| 1972年 | 3篇 |
| 1971年 | 5篇 |
| 1970年 | 1篇 |
| 1969年 | 2篇 |
| 1968年 | 1篇 |
| 1966年 | 1篇 |
| 1965年 | 2篇 |
排序方式： 共有440条查询结果，搜索用时 15 毫秒
1.
2.
3.
4.
5.
A 4-month-old Thoroughbred filly presented for abdominal pain was diagnosed with a T-shaped malformation of the ventral colon at exploratory laparotomy. Following resection and anastomosis of the large colon, no further episodes of abdominal pain occurred during a 12-month follow-up. Acute dehiscence of the linea alba occurred as a complication of the initial laparotomy, but was successfully managed following additional surgical repair. T-shaped malformation of the ventral colon has not previously been reported and is considered a congenital malformation of mesocolon formation. 相似文献
6.
7.
Objective To determine the regional incidence and effectiveness of treatment of failure of passive transfer (FPT) in foals. Design A study of disease incidence. Animals Eighty-eight foals and 57 mares from four studs in the practice area of the Rural Veterinary Centre were tested. Procedure Foals were tested for their serum IgG and total serum protein (TSP) concentration within the first 72 hours of life. Colostrum was collected from mares and specific gravity determined. FPT and partial failure of passive transfer (PFPT) of immunoglobulins was diagnosed when serum IgG concentrations were < 4 g/L and 4 to 8 g/L respectively. Owners of foals diagnosed with FPT were offered treatment with 1 to 2 L plasma (TSP > 70 g/L); 9 (64%) of the affected foals were treated. Results Fourteen foals (16%) had FPT whereas 15 (17%) had PFPT. There were significant differences between the mean TSP concentration in foals with FPT (42.6 ± 4.2 g/L), PFPT (48.1 ± 3.9 g/L) and those acquiring adequate passive immunity (58.9 ± 5.5 g/L) (P < 0.01). Sixteen (29%) mares had pre-suck colostral specific gravity < 1.060 and 12 (71%) foals raised by these mares had FPT or PFPT. The incidence of severe disease (categorised by a sepsis score > 11, positive culture of bacteria from blood or disease requiring hospitalisation) in all foals in the first 2 months of life was 10%. However, none of the nine foals with FPT that received plasma experienced severe disease. In contrast, foals with PFPT had an increased susceptibility to severe disease (P < 0.001) when compared with normal foals. Conclusion Treatment of foals with FPT may reduce the subsequent incidence of severe disease. Pre-suck colostral specific gravity and foal TSP may be used to predict the likelihood of FPT and PFPT. Even though the number of foals studied is small the results highlight the importance of optimal management practices in reducing the incidence of FPT and disease associated with this process. 相似文献
8.
9.
Herrera MR Machocho AK Nair JJ Campbell WE Brun R Viladomat F Codina C Bastida J 《Fitoterapia》2001,72(4):444-448
The alcoholic extract of the fresh bulbs of Cyrtanthus elatus yielded zephyranthine (1) and 1,2-O-diacetylzephyranthine (2), together with three other known alkaloids. Complete assignment of 1H and 13C NMR spectra of compounds 1 and 2 was done by employment of two-dimensional NMR techniques. 相似文献
10.