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1.
Bakary Traoré Nassim Moula Abdoulaye Toure Bara Ouologuem Pascal Leroy Nicolas Antoine-Moussiaux 《Tropical animal health and production》2014,46(7):1303-1312
Despite its importance in Mali’s economy, camel breeding in the country remains poorly documented, impeding effective policy-making in this regard. This study consisted in a 3-month survey and aimed at characterising camel breeding systems in Ansongo, in the region of Gao, Mali. It highlights the diversity of strategies adopted by breeders and their evolutions. Supplementary feeding and veterinary care were seldom practised. In zones close to the Niger River, cattle were substituted to camels. Transhumance routes also are modified but mobility keeps its vital role in the breeding system. Important differences within the study region in the classification of camel breeds have been reported that will influence the implementation of a collective action for animal genetic improvement. The improvement goals should take the actual management, including mobility and the mixed nature of the herds into account. 相似文献
2.
Papa Abdoulaye Fall Françoise Leroi Frédérique Chevalier Camille Guérin 《Journal Of Aquatic Food Product Technology》2013,22(2):84-92
The protective activity of a non-bacteriocinogenic Lactococcus piscium CNCM I-4031 strain against Listeria monocytogenes was investigated in tropical cooked peeled shrimp stored at 8°C in modified atmosphere packaging (50% N2–50% CO2). When inoculated alone (L. piscium 107 CFU g?1 and L. monocytogenes 104 CFU g?1), protective culture and target strain grew very well on shrimp reaching a maximum cell number of 109 CFU g?1 after 7 and 14 days, respectively. In the presence of L. piscium, growth of L. monocytogenes was totally prevented after 3 days of storage. The count was 3.4 log CFU g?1 lower than in the control after 10 days and until the end of storage (31 days). Using the Seafood Spoilage and Safety Predictor Software (http://sssp.dtuaqua.dk), it was shown that pH decrease from 6.58 to 5.94 and lactic acid concentration of 89.65 mM measured in the co-inoculated batch did not fully explain the inhibition observed. 相似文献
3.
Jiali Zhang Wenshui Xia Ping Liu Qinyuan Cheng Talba Tahirou Wenxiu Gu Bo Li 《Marine drugs》2010,8(7):1962-1987
Chitosan has received much attention as a functional biopolymer for diverse applications, especially in pharmaceutics and medicine. Our recent efforts focused on the chemical and biological modification of chitosan in order to increase its solubility in aqueous solutions and absorbability in the in vivo system, thus for a better use of chitosan. This review summarizes chitosan modification and its pharmaceutical/biomedical applications based on our achievements as well as the domestic and overseas developments: (1) enzymatic preparation of low molecular weight chitosans/chitooligosaccharides with their hypocholesterolemic and immuno-modulating effects; (2) the effects of chitin, chitosan and their derivatives on blood hemostasis; and (3) synthesis of a non-toxic ion ligand—D-Glucosaminic acid from Oxidation of D-Glucosamine for cancer and diabetes therapy. 相似文献
4.
J. Nyemeck Binam T. Abdoulaye L. Olarinde A. Kamara A. Adekunle 《Journal Of Agricultural & Food Information》2013,14(2):177-198
This article provides an assessment of the potential impact of operationalizing agricultural innovation platforms (IPs) in the Sudan Savannah zone of Nigeria on adoption of improved maize/legume crop varieties, as measured by the potential outcome approach. The results show that, if the whole population in the intervention area were exposed to these varieties, the adoption rate could be increased to 69% instead of 49%. The study also shows that exposure, as well as adoption, is influenced by numerous social and institutional factors and suggests that the operationalization of IPs could help boost the adoption rate to around 51%. 相似文献
5.
Sabine Stuerz Suchit P. Shrestha Marc Schmierer Duy H. Vu Julia Hartmann Abdoulaye Sow Ando Razafindrazaka Bayuh Belay Abera Boshuwenda Andre Chuma Folkard Asch 《Journal of Agronomy and Crop Science》2020,206(4):466-477
Accurate modelling of plant development is the basis for any assessment of climate change impact on crop yields. Most rice models simulate development (phenology) based on temperature and photoperiod, but often the reliability of these models is reduced beyond the environment they were calibrated for. In our study, we tested the effects of relative air humidity and solar radiation on leaf appearance rate in greenhouse experiments and analysed data sets from field studies conducted in two extremely different rice-growing environments in Nepal and Senegal. We also analysed environmental effects on duration to flowering of one popular IRRI material (IR64) for eight different sites covering the entire temperature range where rice is widely cultivated. Both low relative air humidity and low solar radiation significantly decreased leaf appearance rate. Mean air temperature explained 81% of the variation in duration to flowering across sites, which was furthermore significantly influenced by relative air humidity. Across all sites, a simple linear regression approach including mean air temperature and mean relative humidity in the calculation of duration to flowering led to a root mean square error (RMSE) of 10 days, which was slightly lower than the RMSE of 11 days achieved with an automated calibration tool for parameter optimization of cardinal temperatures and photoperiod sensitivity. Parameter optimization for individual sites led to a much smaller prediction error, but also to large differences in cardinal temperatures between sites, mainly lower optimum temperatures for the cooler sites. To increase the predictive power of phenological models outside their calibration range and especially in climate change scenarios, a more mechanistic modelling approach is needed. A starting point could be including relative air humidity and radiation in the simulation procedure of crop development, and presumably, a closer link between growth and development procedures could help to increase the robustness of phenological models. 相似文献
6.
New technologies, marketing strategies and public policy for traditional food crops: Millet in Niger 总被引：1，自引：0，他引：1
New technology introduction in this semiarid region of the Sahel is hypothesized to be made more difficult by three price problems in the region. First, staple prices collapse annually at harvest. Secondly, there is a between year price collapse in good and very good years due to the inelastic demand for the principal staple, millet, and the large changes in supply from weather and other stochastic factors. Thirdly, government and NGOs intervene in adverse rainfall years to drive down the price increases. Marketing strategies were proposed for the first two price problems and a public policy change for the third. To analyze this question at the firm level a farm programming model was constructed. Based upon surveying in four countries, including Niger, farmers state that they have two primary objectives in agricultural production, first achieving a harvest income target and secondly achieving their family subsistence objective with production and purchases later in the year. Farmers are observed selling their millet at harvest and rebuying millet later in the year. So the first objective takes precedence over the second. A lexicographic utility function was used in which these primary objectives of the farmer are first satisfied and then profits are maximized. According to the model new technology would be introduced even without the marketing strategies. However, the marketing strategies accelerated the technology introduction process and further increased farmers’ incomes. Of the three marketing-policy changes only a change in public policy with a reduction of the price depressing effect (cereal imports or stock releases) substantially increases farmers’ incomes in the adverse years. In developed countries crop insurance and disaster assistance is used to protect farmers in semiarid regions during bad and very bad (disaster) rainfall years. In developing countries finding alternatives to the poverty-nutritional problems of urban residents and poor farmers to substitute for driving down food prices in adverse years could perform the same function as crop insurance in developed countries of facilitating technological introduction by increasing incomes in adverse rainfall years in developed countries. 相似文献
7.
Organic resources and earthworms affect phosphorus availability to sorghum after phosphate rock addition in semi-arid West Africa 总被引：1，自引：0，他引：1
Elisée Ouédraogo Lijbert Brussaard Abdoulaye Mando Leo Stroosnijder 《Biology and Fertility of Soils》2005,41(6):458-465
A field experiment was laid out in Burkina Faso (West Africa) on an Eutric Cambisol to investigate the interaction of organic resource quality and phosphate rock on crop yield and to assess the contribution of earthworms (Millsonia inermis Michaelsen) to P availability after phosphate rock application. Organic resources of different quality were applied at a dose equivalent to 40 kg N ha–1 with or without phosphate rock from Kodjari (Burkina Faso) at a dose equivalent to 25 kg P ha–1, and were compared with control and single phosphate rock treatments in a factorial complete block design with four replicates. Sorghum (Sorghum bicolor L. Moench) variety SARIASSO 14 was grown. Sheep dung had the highest impact on earthworm casting intensity followed by maize straw. Combining organic resources with phosphate rock reduced earthworm casting activities compared to a single application of organic resources or phosphate rock. Addition of phosphate rock to maize straw reduced P availability in earthworm casts whereas combining sheep dung or compost with phosphate rock increased P availability. The contribution of earthworms to Kodjari phosphate rock solubilisation mainly occurred through their casts, as the available P content of casts was 4 times higher than that of the surrounding soil. 相似文献
8.
Abdoulaye Diawara 《CATENA》1984,11(4):259-271
The objective of the work is to achieve a hydrological regionalization of the Republic of Mali for the purpose of data interpolation. The base data was all available information about physiography, climate and hydrology that could be gathered in the studied area. A statistical analysis including tests of quality and homogeneity was carried out and recent methods of classification (empirical orthogonal functions and dendrogram analyses) were then applied which resulted in the division of the studied area in main hydrological zones.The principles underlying the procedure of regionalization as well as a brief presentation of the mathematical basis of the methodology are given in this paper. In the attempt to establish relationships between the physiographic and climatic variables (for interpolation purpose) regression equations were derived between the weights of amplitude functions on the one hand and longitude, latitude and altitude on the other hand. The potential of the interpolation procedure and the equations forming its basis, was also briefly commented. 相似文献
9.
Tillage, organic resources and fertiliser effects on soil carbon (C) dynamics were investigated in 2000 and 2001 in Burkina Faso (West Africa). A split plot design with four replications was laid-out on a loamy-sand Ferric Lixisol with till and no-till as main treatments and fertiliser types as sub-treatments. Soil was fractionated physically into coarse (0.250–2 mm), medium (0.053–0.250 mm) and fine fractions (< 0.053 mm). Particulate organic carbon (POC) accounted for 47–53% of total soil organic carbon (SOC) concentration and particulate organic nitrogen (PON) for 30–37% of total soil nitrogen concentration. The POC decreased from 53% of total SOC in 2000 to 47% of total SOC in 2001. Tillage increased the contribution of POC to SOC. No-till led to the lowest loss in SOC in the fine fraction compared to tilled plots. Well-decomposed compost and single urea application in tilled as well as in no-till plots induced loss in POC. Crop N uptake was enhanced in tilled plots and may be up to 226 kg N ha−1 against a maximum of 146 kg N ha−1 in no-till plots. Combining crop residues and urea enhanced incorporation of new organic matter in the coarse fraction and the reduction of soil carbon mineralisation from the fine fraction. The PON and crop N uptake are strongly correlated in both till and no-till plots. Mineral-associated N is more correlated to N uptake by crop in tilled than in no-till plots. Combining recalcitrant organic resources and nitrogen fertiliser is the best option for sustaining crop production and reducing soil carbon decline in the more stabilised soil fraction in the semi-arid West Africa. 相似文献
10.
Nesseim Thierry Daniel Tamsir Benteboula Moncef Dieng Abdoulaye Mergeai Guy Marechal Françoise Hornick Jean-Luc 《Tropical animal health and production》2019,51(6):1383-1391
Tropical Animal Health and Production - This study was conducted to determine intake and growth performance of broiler chicks fed with Jatropha curcas kernel meal physico-chemically and... 相似文献