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Dahouda M.,University Abomey Calavi | Mensah G.A.,National Institute of Agricultural Research of Benin | Thewis A.,University of Liege
International Journal of Poultry Science | Year: 2013

The local poultry population of Benin is composed of various ecotypes including chickens Holli, Sahoue, Fulani, North and South. To better characterize them, our study aims to assess their carcass traits according to genetic type, breeding system and slaughter age. Thus, 260 chickens of which 52 chickens of each ecotype were divided in two lots and reared respectively under traditional and improved breeding system. For each breeding system, 26 cockerels of each ecotype were slaughtered at 20, 24 and 28 weeks old for carcass traits study. The results show that the live weight, the carcass weight, the weight of the cuts of thigh-drumsticks and wings of Holli chickens were the highest (p<0.001). The lowest live weight and carcass weight were noted in South ecotype (p<0.001). The carcass yields of the five genetic types of chicken were similar (p>0.05). The breast weight of Holli and Fulani were similar (p>0.05) but heavier (p<0.001) than the one of Sahoue, North and South ecotypes. The live weight and the carcass weight of chickens reared under improved breeding system were higher than those of traditional system (p<0.01). The carcass drip loss was more important in chickens bred under traditional system (p<0.001). The live weight and the carcass cuts value were significantly affected by slaughter age (p<0.001). The best carcass yields were recorded at 24 weeks (p<0.001) for both rearing systems. Therefore, the ideal slaughter age of indigenous chickens of Benin is 24 weeks. © Asian Network for Scientific Information, 2013. Source


Agbangba E.C.,University of Parakou | Agbangba E.C.,Cheikh Anta Diop University | Olodo G.P.,University of Parakou | Dagbenonbakin G.D.,National Institute of Agricultural Research of Benin | And 3 more authors.
African Journal of Agricultural Research | Year: 2011

Nutritional diagnosis is an important tool for increasing fruit yield and fruit quality through efficient fertilization management. The aim of the study is to investigate whether there are specific DRIS norms for pineapple 'Perola' for a better soil fertility management in Benin. A preliminary Diagnosis and Recommendation Integrated System (DRIS) norms for 'Perola' pineapple growing in plantations Allada district (Benin) are presented. DRIS norms were established from a data bank of leaf nutrient concentration (N, P, K, Ca, Mg and Zn) and fruit yield with 60 samples gathered from farmers' plantations. The data were divided into high-yielding (>66.7 t/ha) and low-yielding (<66.7 t/ha) sub-populations and norms were computed using standard DRIS procedures. These norms were developed with data from only one cropping region, so they should be considered as preliminary, probably requiring some modification as more data become available. The norms were significantly different from those presented in the literature, except for N/K whose value is similar to the existing norm. We conclude that our results revealed that DRIS norms depend on pineapple cultivar. © 2011 Academic Journals. Source


Dagbenonbakin G.D.,National Institute of Agricultural Research of Benin | Agbangba E.C.,University of Parakou | Bognonkpe J.P.,University of Abobo Adjame Abidjan | Goldbach H.,University of Bonn
European Journal of Scientific Research | Year: 2011

Critical leaf nutrient concentrations have often been used to diagnose the lack of performance of crop resulting from nutritional causes. The Diagnosis and Recommendation Integrated System (DRIS) is known to provide reliable means for linking leaf nutrient concentrations to the yield, and may be developed for the yam crop using existing experimental data. In the present study, carried out in the Upper Catchment of Benin in 2001 and 2002, tuber dry matter yield of yam and leafnutrient concentration data from organic and inorganic trials were used to establish DRIS norms for N, P, K, Mg, Ca, and Zn and statistical parameters for yam. The DRIS norms provided by this study were N/P: 13.5, N/Zn: 1027.2, K/N: 0.8, K/Zn: 814.2, Mg/P: 2.3, Mg/Ca: 0.3. Although the database was relatively small, K/N the key biological significant ratio was within the expected narrow ranges for higher plants, giving credibility to both the database and the DRIS model. Data fromfuture surveys and field experiments may subsequently be used to enlarge the database allowing the refinement of the model parameters and hopefully an expansion of the diagnostic scope such as to include other micro-nutrients. As it stands, this preliminary DRIS model for yam offers a good diagnostic tool for evaluating the N, P, K, Ca, and Zn needs for yam cropping in Benin. © EuroJournals Publishing, Inc. 2011. Source


Kindomihou V.M.,University Abomey Calavi | Dagbenonbakin G.D.,National Institute of Agricultural Research of Benin | Bognonkpe J.-P.,University of Abobo Adjame Abidjan | Sinsin B.A.,University Abomey Calavi | Meerts P.J.,Free University of Colombia
European Journal of Scientific Research | Year: 2011

Variation in silica content was examined in relation to foliar structure, chemical composition and anatomy of nine perennial tropical fodder grass species cultivated under uniform conditions. The following parameters were determined: silica (SiO2) and soluble ash (SA) in blades and sheaths; carbon, relative water content (RWC) and specific leaf area (SLA) of blades only. Proportions of different tissues were determined by image analysis of transverse sections of leaves. There was a large variation in SiO2 concentration among species (range 2.4 -13.6%). SiO2 and SA were positively correlated in blades and sheaths. All other traits also showed significant variation among species. The nine species also showed contrasting anatomy. A significant pattern of covariations existed between SLA, RWC and proportion of parenchyma. High SiO2 concentrations were generally associatedwith sclerophylly (i.e. a high proportion of vascular tissue and sclerenchyma, and a low (SLA and RWC). Therefore, the results did not support the hypothesis that SiO2 might represent an alternative mechanism of structural support without carbon cost. © 2011 EuroJournals Publishing, Inc. Source


Gnonlonfin G.J.B.,Copenhagen University | Gnonlonfin G.J.B.,National Institute of Agricultural Research of Benin | Gnonlonfin G.J.B.,University Abomey Calavi | Hell K.,CIP Benin | And 6 more authors.
Critical Reviews in Food Science and Nutrition | Year: 2013

Mycotoxins contamination in some agricultural food commodities seriously impact human and animal health and reduce the commercial value of crops. Mycotoxins are toxic secondary metabolites produced by fungi that contaminate agricultural commodities pre- or postharvest. Africa is one of the continents where environmental, agricultural and storage conditions of food commodities are conducive of Aspergillus fungi infection and aflatoxin biosynthesis. This paper reviews the commodity-wise aetiology and contamination process of aflatoxins and evaluates the potential risk of exposure from common African foods. Possible ways of reducing risk for fungal infection and aflatoxin development that are relevant to the African context. The presented database would be useful as benchmark information for development and prioritization of future research. There is need for more investigations on food quality and safety by making available advanced advanced equipments and analytical methods as well as surveillance and awareness creation in the region. © 2013 Copyright Taylor and Francis Group, LLC. Source

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