全文获取类型
收费全文 | 201篇 |
免费 | 44篇 |
专业分类
林业 | 11篇 |
基础科学 | 1篇 |
21篇 | |
综合类 | 38篇 |
农作物 | 15篇 |
水产渔业 | 3篇 |
畜牧兽医 | 152篇 |
园艺 | 2篇 |
植物保护 | 2篇 |
出版年
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 10篇 |
2017年 | 16篇 |
2016年 | 8篇 |
2015年 | 11篇 |
2014年 | 17篇 |
2013年 | 20篇 |
2012年 | 10篇 |
2011年 | 19篇 |
2010年 | 17篇 |
2009年 | 7篇 |
2008年 | 3篇 |
2007年 | 3篇 |
2006年 | 6篇 |
2005年 | 4篇 |
2003年 | 7篇 |
2002年 | 6篇 |
2000年 | 3篇 |
1999年 | 5篇 |
1998年 | 5篇 |
1997年 | 6篇 |
1996年 | 2篇 |
1995年 | 4篇 |
1994年 | 2篇 |
1992年 | 2篇 |
1988年 | 2篇 |
1984年 | 3篇 |
1980年 | 2篇 |
1975年 | 2篇 |
1973年 | 1篇 |
1972年 | 2篇 |
1969年 | 2篇 |
1968年 | 1篇 |
1966年 | 1篇 |
1965年 | 1篇 |
1957年 | 2篇 |
1955年 | 1篇 |
1948年 | 1篇 |
1947年 | 3篇 |
1945年 | 1篇 |
1944年 | 2篇 |
1943年 | 3篇 |
1941年 | 1篇 |
1940年 | 1篇 |
1938年 | 1篇 |
1919年 | 1篇 |
1903年 | 1篇 |
1902年 | 1篇 |
1893年 | 2篇 |
排序方式: 共有245条查询结果,搜索用时 500 毫秒
1.
AE Jackson 《Australian veterinary journal》2015,93(12):431-432
2.
Polymorphic mountain whitefish (Prosopium williamsoni) in a coastal riverscape: size class assemblages,distribution, and habitat associations
下载免费PDF全文
![点击此处可从《Ecology of Freshwater Fish》网站下载免费的PDF全文](/ch/ext_images/free.gif)
We compared the assemblage structure, spatial distributions, and habitat associations of mountain whitefish (Prosopium williamsoni) morphotypes and size classes. We hypothesised that morphotypes would have different spatial distributions and would be associated with different habitat features based on feeding behaviour and diet. Spatially continuous sampling was conducted over a broad extent (29 km) in the Calawah River, WA (USA). Whitefish were enumerated via snorkelling in three size classes: small (10–29 cm), medium (30–49 cm), and large (≥50 cm). We identified morphotypes based on head and snout morphology: a pinocchio form that had an elongated snout and a normal form with a blunted snout. Large size classes of both morphotypes were distributed downstream of small and medium size classes, and normal whitefish were distributed downstream of pinocchio whitefish. Ordination of whitefish assemblages with nonmetric multidimensional scaling revealed that normal whitefish size classes were associated with higher gradient and depth, whereas pinocchio whitefish size classes were positively associated with pool area, distance upstream, and depth. Reach‐scale generalised additive models indicated that normal whitefish relative density was associated with larger substrate size in downstream reaches (R2 = 0.64), and pinocchio whitefish were associated with greater stream depth in the reaches farther upstream (R2 = 0.87). These results suggest broad‐scale spatial segregation (1–10 km), particularly between larger and more phenotypically extreme individuals. These results provide the first perspective on spatial distributions and habitat relationships of polymorphic mountain whitefish. 相似文献
3.
AE Jackson 《Australian veterinary journal》2016,94(11):395-396
4.
AE Jackson 《Australian veterinary journal》2011,89(6):197-198
Computer model predictions and field observations of anthelmintic resistance in sheep · Dangers of off‐label use of barium selenate · Elbow luxation in dogs and cats · Prognosis of joint infections in adult horses · Omentalisation for mediastinal abscess in a dog · Adenoviruses in lizards 相似文献
5.
The effect of animal health products on the formation of injection site lesions in subprimals of experimentally injected beef calves
下载免费PDF全文
![点击此处可从《The Canadian veterinary journal. La revue veterinaire canadienne》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Van Donkersgoed J Dubeski PL VanderKop M Aalhus JL Bygrove S Starr WN 《The Canadian veterinary journal. La revue veterinaire canadienne》2000,41(8):617-622
Two hundred and twenty beef calves were used in an experimental study to determine the occurrence of injection site lesions at slaughter (15 to 18 months of age) following subcutaneous and intramuscular injection of various products into the top hip (top butt), thigh (round), and neck or rib of calves at birth, branding, or weaning. Products tested were: 2 different preparations of selenium; a 2-way, a 7-way, and an 8-way clostridial bacterin; 2 combination 7-way clostridial and Haemophilus somnus bacterins; 2 H. somnus bacterins; 2 different 4-way modified-live viral respiratory vaccines; a 4-way killed viral and H. somnus vaccine; and penicillin, florfenicol, ceftiofur, trimethoprim-sulfa, and tilmicosin. The occurrence of lesions, number of steaks affected with lesions, the trim weight of lesions, the histological class of lesions, and the estimated economic losses are described. Generally, products administered subcutaneously in the neck produced minimal tissue damage and economic losses. 相似文献
6.
7.
8.
9.
10.