全文获取类型
收费全文 | 89篇 |
免费 | 4篇 |
专业分类
林业 | 1篇 |
农学 | 1篇 |
基础科学 | 2篇 |
14篇 | |
综合类 | 4篇 |
农作物 | 9篇 |
水产渔业 | 13篇 |
畜牧兽医 | 33篇 |
园艺 | 2篇 |
植物保护 | 14篇 |
出版年
2023年 | 2篇 |
2022年 | 4篇 |
2021年 | 7篇 |
2020年 | 7篇 |
2019年 | 6篇 |
2018年 | 2篇 |
2017年 | 2篇 |
2016年 | 3篇 |
2015年 | 2篇 |
2014年 | 4篇 |
2013年 | 8篇 |
2012年 | 2篇 |
2011年 | 4篇 |
2010年 | 5篇 |
2009年 | 4篇 |
2008年 | 5篇 |
2007年 | 2篇 |
2006年 | 2篇 |
2005年 | 2篇 |
2004年 | 3篇 |
2003年 | 3篇 |
2002年 | 3篇 |
2001年 | 1篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1993年 | 1篇 |
1988年 | 1篇 |
1973年 | 1篇 |
1970年 | 1篇 |
排序方式: 共有93条查询结果,搜索用时 0 毫秒
61.
Mohamed Salah Azaza Wassim Kammoun Abdelwaheb Abdelmouleh Mohamed Mejdeddine Kraϊem 《Aquaculture International》2009,17(6):507-521
This study was undertaken in order to determine the effect of feeding heat-treated, defatted soybean meal (SBM) on growth,
feed utilization, and body composition of Nile tilapia (Oreochromis niloticus). A control diet (SBM0) of 378 g kg−1 crude protein with 18.4 kJ g−1 gross energy was formulated, and three diets identical to the basal diet were autoclaved for 10, 20, or 30 min. The autoclaved
diets were named SBM10, SBM20, and SBM30, respectively. Each diet treatment was applied to triplicate groups of 30 fish (2.45 ± 0.03 g) per tank (120 l). The fish
were hand fed to satiation four times daily for 45 days. At the end of the feeding trial the fish fed with the SBM30 diet had significantly (P < 0.05) higher weight gain and protein efficiency ratio than those fed with the other diets. No feed-related mortality was
observed during the whole experimental period. Heating SBM for 30 min reduced trypsin inhibitor activity (TIA) and increased
apparent protein digestibility (APD), and indicated significant differences (P < 0.05) among various treatments. No significant differences were found in carcass moisture, lipid, and ash of fish fed with
different experimental diets. An increase in the body protein content of fish fed with diet SBM30 was significantly (P < 0.05) higher than in all other experimental groups. The results of this study seem to indicate that autoclaving the SBM
for 30 min improved its nutritional value in practical feeds for Nile tilapia fingerlings. 相似文献
62.
63.
64.
Salah A. Tahoun 《植物养料与土壤学杂志》1973,136(2):151-155
65.
Ben H. Thameur Sghaier Soufine Heni Haj Ammar Salah Hammami 《The Onderstepoort journal of veterinary research》2021,88(1)
The increasing threat of vector-borne diseases (VBDs) represents a great challenge to those who manage public and animal health. Determining the spatial distribution of arthropod vector species is an essential step in studying the risk of transmission of a vector-borne pathogen (VBP) and in estimating risk levels of VBD. Risk maps allow better targeting surveillance and help in designing control measures. We aimed to study the geographical distribution of Culicoides imicola, the main competent vector of Bluetongue virus (BTV) in sheep in Tunisia. Fifty-three records covering the whole distribution range of C.imicola in Tunisia were obtained during a 2-year field entomological survey (August 2017 – January 2018 and August 2018 – January 2019). The ecological niche of C. imicola is described using ecological-niche factor analysis (ENFA) and Mahalanobis distances factor analysis (MADIFA). An environmental suitability map (ESM) was developed by MaxEnt software to map the optimal habitat under the current climate background. The MaxEnt model was highly accurate with a statistically significant area under curve (AUC) value of 0.941. The location of the potential distribution of C. imicola is predicted in specified regions of Tunisia. Our findings can be applied in various ways such as surveillance and control program of BTV in Tunisia. 相似文献
66.
Sadam Mohamad Hassan Ahmed Ramadhan Muhaimeed Hazem Sabri Abedalhammed Najlaa Salah Madlul Tan Tiek Aun 《Aquaculture Research》2021,52(1):345-355
This work aims to develop a suitable aquaculture system to solve issues pertaining to water quality in recirculating aquaculture systems (RAS) thereby improving fish growth performance and their feed conversion ratio (FCR). It is known that the efficiency of nutrient decomposition depends on the amount and species of bacteria present in the filter, and these can in turn be regulated by the pH. Our study shows that the significant increase in pH from 7.45 to 7.51 and 7.47 is achieved after the water was filtered through sawdust and wood wool respectively. At the same time, nitrite concentrations were found to have significantly decreased from 0.06 ppm in the control to 0.01 ppm in the sawdust treatment. Changes in the physical–chemical properties of treated water affect the biological properties of the organisms. It was found that the average final body weight for fish in the wood wool treatment 30.96 g and fish in the sawdust treatment 31.44 g was significantly higher compared to that for the fish in the control treatment 28.42 g. The use of sponge, wood wool or sawdust resulted in significantly lower FCR and therefore better fish productivity in RAS. At the same time, the red blood cell count, plasma urea, plasma creatinine, plasma albumin, and GOT and GPT were significantly higher in fish in the plastic, sponge, wood wool or sawdust treatment compared to the control treatment. In summary, this study demonstrates the benefits of using sponge, wood, wool and sawdust as biofilter media for aquaculture. 相似文献
67.
噪音对家禽的危害 总被引:1,自引:0,他引:1
董海亮 《国外畜牧学(猪与禽)》2006,(3):36-37
关于噪音对家禽生长、产蛋和健康的影响,一直就很少有人研究。本文指出,长时间的过量噪音对家禽产是有害的,因而必须采取措施来减少这一有害作用 相似文献
68.
Degradation of atrazine and isoproturon in surface and sub-surface soil materials undergoing different moisture and aeration conditions 总被引:1,自引:0,他引:1
The influence of different moisture and aeration conditions on the degradation of atrazine and isoproturon was investigated in environmental samples aseptically collected from surface and sub-surface zones of agricultural land. The materials were maintained at two moisture contents corresponding to just above field capacity or 90% of field capacity. Another two groups of samples were adjusted with water to above field capacity, and, at zero time, exposed to drying-rewetting cycles. Atrazine was more persistent (t(1/2) = 22-35 days) than isoproturon (t(1/2) = 5-17 days) in samples maintained at constant moisture conditions. The rate of degradation for both herbicides was higher in samples maintained at a moisture content of 90% of field capacity than in samples with higher moisture contents. The reduction in moisture content in samples undergoing desiccation from above field capacity to much lower than field capacity enhanced the degradation of isoproturon (t(1/2) = 9-12 days) but reduced the rate of atrazine degradation (t(1/2) = 23-35 days). This demonstrates the variability between different micro-organisms in their susceptibility to desiccation. Under anaerobic conditions generated in anaerobic jars, atrazine degraded much more rapidly than isoproturon in materials taken from three soil profiles (0-250 cm depth). It is suggested that some specific micro-organisms are able to survive and degrade herbicide under severe conditions of desiccation. 相似文献
69.
70.
Salah MA Bedir E Toyang NJ Khan IA Harries MD Wedge DE 《Journal of agricultural and food chemistry》2003,51(26):7607-7610
Hexane and ethyl acetate phases of the methanol extract of Macaranga monandra showed fungal growth inhibition of Colletotrichum acutatum, C. fragariae and C. gloeosporioides, Fusarium oxysporum, Botrytis cinerea, Phomopsis obscurans, and P. viticola. Bioassay-guided fractionation led to the isolation of two active clerodane-type diterpenes that were elucidated by spectroscopic methods (1D-, 2D-NMR, and MS) as kolavenic acid and 2-oxo-kolavenic acid. A 96-well microbioassay revealed that kolavenic acid and 2-oxo-kolavenic acid produced moderate growth inhibition in Phomopsis viticola and Botrytis cinerea. 相似文献