全文获取类型
收费全文 | 159篇 |
免费 | 10篇 |
国内免费 | 4篇 |
专业分类
林业 | 11篇 |
农学 | 9篇 |
基础科学 | 1篇 |
29篇 | |
综合类 | 37篇 |
农作物 | 9篇 |
水产渔业 | 4篇 |
畜牧兽医 | 49篇 |
园艺 | 5篇 |
植物保护 | 19篇 |
出版年
2023年 | 2篇 |
2022年 | 4篇 |
2021年 | 3篇 |
2020年 | 8篇 |
2019年 | 5篇 |
2018年 | 9篇 |
2017年 | 14篇 |
2016年 | 7篇 |
2015年 | 7篇 |
2014年 | 9篇 |
2013年 | 12篇 |
2012年 | 8篇 |
2011年 | 10篇 |
2010年 | 12篇 |
2009年 | 7篇 |
2008年 | 6篇 |
2007年 | 9篇 |
2006年 | 6篇 |
2005年 | 6篇 |
2004年 | 6篇 |
2003年 | 3篇 |
2002年 | 3篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1973年 | 1篇 |
1971年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有173条查询结果,搜索用时 0 毫秒
171.
Muhammad Kasib Khan Muhammad Sohail Sajid Zafar Iqbal 《Research in veterinary science》2009,87(1):70-75
The present study reports the prevalence, effects of treatment and cost benefit analysis of bovine fasciolosis in five districts of Punjab Province viz Sargodha, Jhang, Muzaffargarh, Lodhran and Layyah. From each of the five districts, 80 animals were selected and fortnightly screened through standard coprological procedures for a period of one year for the presence of eggs of Fasciola species. Of 4800 faecal samples analyzed, 1222 (25.46%) were found positive for fasciolosis. The occurrence of Fasciola (F.) gigantica (22.40%) was higher (P < 0.05) than F. hepatica (3.06%). Highest month-wise prevalence (P < 0.05) of fasciolosis was found in winter (39.08%) followed in decreasing order by spring (29.50%), autumn (20.33%) and summer (12.92%). District-wise prevalence of fasciolosis was highest (P < 0.05) in Sargodha (40.31%) and lowest in Layyah (11.77%) while other districts were having intermediate values of prevalence of fasciolosis. Species-wise prevalence of fasciolosis was found higher (P < 0.05) in buffaloes (30.50%) as compared to cattle (20.42%). However, there were no age and sex-related differences (P > 0.05) in prevalence of fasciolosis. A strong positive association of grazing (OR = 1.81), mixed farming of small and large ruminants (OR = 1.39), stagnant pond bathing (OR = 2.24) and river/canal bathing (OR = 2.06) was found with the prevalence of fasciolosis as compared to stall feeding, separate farming of small and large ruminants and rivers/canal/ tap water bathing, respectively. Post-treatment average milk increase of 0.62 L per animal per day with 0.35% higher fat was observed in fasciolicide-treated animals with the cost benefit ratio of 3.9. The results provided significant data on the epidemiology of five districts of Punjab province which may be helpful for the planners and small holder dairy farmers for control of fasciolosis in the study districts. 相似文献
172.
摩擦禾属于禾本科玉蜀黍族摩擦禾属,起源于美洲,与玉米、大刍草具有共同祖先,其在玉米的起源与进化过程中可能扮演着重要角色。摩擦禾是一种多年生暖季型丛生C4禾草,常用于优质饲草料生产、控制土壤侵蚀和生物质能源。其作为玉米的近缘属材料,保存有栽培玉米不具有的优质、抗病、抗寒、耐涝、耐盐和多年生等多种优良基因,是拓展玉米遗传基础的重要种质。本文从摩擦禾属的习性和分布、摩擦禾属的分类、摩擦禾属的种间可杂交性、摩擦禾属与玉蜀黍属杂交性、摩擦禾属的优良特性和摩擦禾基因向玉米转移的途径等方面进行综述,为摩擦禾属的研究和利用提供参考。 相似文献
173.