全文获取类型
收费全文 | 1437篇 |
免费 | 66篇 |
学科分类
农业科学 | 1503篇 |
出版年
2023年 | 11篇 |
2022年 | 11篇 |
2021年 | 17篇 |
2020年 | 37篇 |
2019年 | 23篇 |
2018年 | 25篇 |
2017年 | 19篇 |
2016年 | 31篇 |
2015年 | 22篇 |
2014年 | 29篇 |
2013年 | 65篇 |
2012年 | 56篇 |
2011年 | 89篇 |
2010年 | 58篇 |
2009年 | 38篇 |
2008年 | 83篇 |
2007年 | 63篇 |
2006年 | 66篇 |
2005年 | 48篇 |
2004年 | 50篇 |
2003年 | 68篇 |
2002年 | 53篇 |
2001年 | 23篇 |
2000年 | 23篇 |
1999年 | 32篇 |
1998年 | 16篇 |
1997年 | 11篇 |
1996年 | 8篇 |
1995年 | 8篇 |
1994年 | 9篇 |
1992年 | 24篇 |
1991年 | 22篇 |
1990年 | 21篇 |
1989年 | 30篇 |
1988年 | 25篇 |
1986年 | 21篇 |
1985年 | 21篇 |
1984年 | 16篇 |
1983年 | 11篇 |
1982年 | 10篇 |
1981年 | 11篇 |
1979年 | 12篇 |
1978年 | 8篇 |
1974年 | 12篇 |
1972年 | 7篇 |
1971年 | 8篇 |
1970年 | 13篇 |
1968年 | 12篇 |
1967年 | 7篇 |
1966年 | 7篇 |
排序方式: 共有1503条查询结果,搜索用时 15 毫秒
1.
Nemadectin, a new broad-spectrum endectocide, was highly efficacious against natural infections of all the major canine gastrointestinal helminths. At single oral dosages of 0.2-0.4 mg kg-1 body weight (BW), a liquid formulation administered in gelatin capsules was 100% effective in eliminating natural infections of Toxocara canis, Toxascaris leonina, Ancylostoma caninum and Uncinaria stenocephala. Tablets (267 mg) containing 4.6% nemadectin given at a rate of 1/3 tablet per 20 kg BW (0.2 mg nemadectin kg-1) were 100% active against T. canis, A. caninum and U. stenocephala. With both formulations, an increase in the dose rate to 0.6-0.8 mg kg-1 BW resulted in 99-100% elimination of Trichuris vulpis infections. No adverse reactions were observed in any of the treated dogs. 相似文献
2.
3.
Bisset SA Vlassoff A McMurtry LW Elliott DC Cobb RM Kieran PJ Wood IB 《New Zealand veterinary journal》1992,40(3):97-100
The efficacy of an oral formulation of the newly developed parasiticide, moxidectin, was tested against benzimidazole-resistant Haemonchus contortus, Trichostrongylus colubriformis, and Nematodirus spathiger, levamisole-resistant Ostertagia circumcincta, and susceptible Cooperia curticei infections in weaned lambs. Thirty-two lambs were experimentally infected with mixed doses of the above strains of nematodes. They were allocated into four treatment groups by stratified randomisation using liveweights and faecal egg counts 28 days later. One group received moxidectin at 0.2 mg/kg liveweight, one group oxfendazole at 4.5 mg/kg liveweight, one group levamisole at 7.5 mg/kg liveweight and the last group remained untreated as the control. Worm burdens in the lambs at slaughter 10 days after oral treatment confirmed the resistance status of the nematode strains used, and showed that moxidectin had a greater than 99.9% efficacy (p<0.01) against all of them. No adverse effects due to treatment with moxidectin were observed in any of the animals. 相似文献
4.
5.
The grey squirrel is recognised as a pest species of economic importance but the justification of the view appears to be founded on local areas of severe damage. Despite evidence that damage may not be alleviated by squirrel population destruction, Warfarin poisoning was introduced as an alternative to trapping.The utilisation by wildlife of a poison hopper designed for grey squirrel control was investigated by automatic photography. Results confirmed that a number of species may feed from the grain presented via the hopper. However, the majority of the bait was removed during the hours of darkness when grey squirrels were not active. It is a conservative estimate that between 55 and 65% of the grain entered the environment via animals other than squirrels.In addition, the removalof bait by night visitors resulted in the accumulation of large quantities of bait at and around the entrance to the hopper tunnel. This increased accessibility to the potentially poisoned bait by animals other than squirrels.Until such time as evidence is produced to show these results as exceptional, it can only be concluded that fears expressed over the lack of specificity of this method of control are justified. 相似文献
6.
7.
8.
9.
10.
Marco Grella Fabrizio Gioelli Paolo Marucco Ingrid Zwertvaegher Eric Mozzanini Marco Pittarello Paolo Balsari Spyros Fountas David Nuyttens Monica Mezzalama Massimo Pugliese 《Pest management science》2023,79(11):4423-4438