Les systèmes intégrés de production constituent l'une des voies essentielles pour une agriculture durable. Cette étude a pour but d'évaluer l'effet d'une alimentation à base de Azolla filiculoïdes, Elaeis guineensis, Ipomoea aquatica et Panicum maximum sur les performances zootechniques des lapins et le potentiel nutritif des crottes de lapins qui en résultent sur l'aquaculture. Pour ce faire, trente-six (36) lapereaux sevrés de trois (3) semaines d'âge et pesant en moyenne 70,08 ± 0,04g chacun, ont été utilisés pour l'expérimentation. Ces lapereaux ont été répartis en quatre (4) lots de trois (3) lapereaux chacun, disposés dans des cages. Le lot 1 a reçu l'aliment conventionnel VETO SA vendu sur le marché béninois (cet aliment est désigné ici R 0), les lots 2, 3 et 4 ont reçu respectivement un régime complété avec Ipomea aquatica R 1 (Ia), Elaeis guineensis (feuille) R 2 (Eg), et Panicum maximum R 3 (Pm). Des toiles de moustiquaires ont été suspendues en dessous des cages pour recueillir les crottes. Les lapereaux nourris au régime complété avec Panicum maximum ont eu un gain moyen journalier de 76,19 ± 8,24 g/j contre 61,90 ± 8,21 g/j pour R 0 et R 2 (Eg) et 54,76 ± 14,86 g/j pour R 1 (Ia) par cage. Le régime complété au Panicum maximum donne de bonnes performances zootechniques et constitue un atout économique pour les cuniculteurs. Les ratios N/P/K des crottes observés respectivement pour R 3 (Pm), R 2 (Eg), R 1 (Ia)
Due to costs of setting up and operating electrical stirring systems to keep algae in suspension and exposed to light, cultivation of monospecific algae is poorly expanded in developping countries. However, some algal species such as Arthrospira platensis, are equipped with gaseous vesicles that allow them to stay afloat and increase their exposure to light. In this study, we investigated in an unstirred outdoor environment, its growth kinetic and purifying performance in a brewery effluent-based media. Batch cultures were carried out in three experimental treatments and evolution of physicochemical and growth parameters were monitored. Then its contribution to depollution was determined. Results show that optimal conditions for producing A. platensis include the culture tank transparency, the effluent dilution (i.e. 10%), and the culture media amendment with sodium bicarbonate and sodium nitrate. The average productivity recorded reached 0.55 g DW·L−1·d−1 during the exponential growth phase, while preserving culture from contamination. COD and total Nitrogen concentrations were reduced for 32.5% and 64.91%. Such results open up prospects for low-cost production of certain algae, in transparent and relatively high barrels, thus breaking, the classic barriers related to shallow basin depth and mechanical agitation traditionally considered as critical to the success of algal production.
This study is conducted to characterize the heavy metal contamination of CHU-MEL effluents discharged into the Cotonou lagoon in order to assess the potential risk of these discharges for this ecosystem. To achieve this objective, the effluents collected at the end of the pipes acting as weirs in the lagoon were analyzed. The results from physico-chemical and heavy metals analyzes have made it possible to assess the quality of the effluents. The values of pH, temperature, conductivity, TDS and dissolved oxygen measured in situ are, on average, 7.95; 29.60°C; 639.60 µS/cm; 457.48 mg/l and 0.22 mg/L. The determination of heavy metals in the effluents showed low levels of contamination. The average levels of lead, cadmium, mercury and total iron are 0.1727 mg/L, 0.0261 mg/L, 0.0010 mg/L and 0.25 mg/L, respectively. This study shows that most of the parameters studied in the CHU-MEL effluent are in compliance with the standards. These effluents therefore pose a low risk for the aquatic organisms of the receiving environment, this added to the dilution effect of the effluents in the waters of the lagoon. However, the continual discharge of these effluents into the lagoon with their share of heavy metals.
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