全文获取类型
收费全文 | 115篇 |
免费 | 16篇 |
专业分类
林业 | 12篇 |
农学 | 6篇 |
26篇 | |
农作物 | 5篇 |
水产渔业 | 31篇 |
畜牧兽医 | 23篇 |
园艺 | 5篇 |
植物保护 | 23篇 |
出版年
2024年 | 1篇 |
2023年 | 4篇 |
2022年 | 5篇 |
2021年 | 7篇 |
2020年 | 6篇 |
2019年 | 8篇 |
2018年 | 8篇 |
2017年 | 9篇 |
2016年 | 7篇 |
2015年 | 7篇 |
2014年 | 4篇 |
2013年 | 22篇 |
2012年 | 10篇 |
2011年 | 6篇 |
2010年 | 3篇 |
2009年 | 1篇 |
2008年 | 2篇 |
2007年 | 1篇 |
2006年 | 4篇 |
2005年 | 2篇 |
2003年 | 3篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 3篇 |
1997年 | 1篇 |
1985年 | 1篇 |
1975年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有131条查询结果,搜索用时 78 毫秒
131.
The objective of this study was to investigate the effects of five isonitrogenous (35% crude protein) diets having different
energy contents; 10.85, 11.82, 12.73, 13.69, and 15.06 MJ DE/kg, respectively, on the gonad development and weight gain of
Sharptooth catfish fingerlings. Energy contents of the experimental diets were increased with the increasing amount of soy-acid
oil (0, 4, 8.5, 13, 18%) and each group of fish was fed on their respective diets (group I was fed diet I) during 180 days.
The gonad maturation was significantly affected by dietary energy. In both sexes, the histological inspections of the gonads
did reveal differences among the fish fed different energetic diets. Fish fed diets I, II, and III had significantly heavier
and more developed gonads compared to those on diets IV and V. Fish fed the higher energetic diets (IV and V) had partially
low numbers of yolky oocytes compared to other groups. The mean GSI values of female and male fish fed with diet III was significantly
greater than those fed diets with higher dietary energy; however, higher HSI values were recorded for fish fed with the higher
energetic diets (IV and V). Also, the best weight gain for both males and females were recorded from the fish fed diet III
(12.73 MJ DE/kg). Therefore, on the basis of the present results, among energy levels tested, 12.73 MJ DE/kg was found to
be optimal for healthy gonad development and weight gain. 相似文献