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See detailLes co-produits de la graine de coton en alimentation du poulet de chair
Diaw, Mahamadou Tandiang; Dieng, Abdoulaye; Mergeai, Guy ULg et al

in Annales de Médecine Vétérinaire (2011), 155

Cottonseed by-products arevery high in nutrients and theirchemical composition varieshighly according to the varietiesof cotton and the various treatmentsaiming at extracting oil.Their use in animal ... [more ▼]

Cottonseed by-products arevery high in nutrients and theirchemical composition varieshighly according to the varietiesof cotton and the various treatmentsaiming at extracting oil.Their use in animal nutrition, andparticularly in broilers, is especiallylimited by the free gossypolwhich can damage varioustissues and also decreases theperformances of growth and dietefficiency. The incorporation ofcottonseed meal in broilers dietmay be increased following chemicalbinding of free gossypol,but these methods have drawbacks.Ferrous sulfate denaturesfeed and the use of lysine to bindgossypol is limited by the expensivenessof this product while thebiological fermentation is verycomplex and inapplicable, as tonow, on a large way. Glandlessvarieties could be incorporatedat a very high level in diets andtherefore could contribute todecrease the protein feed requirements.Unfortunately, agronomicconstraints associated to thesecrops have limited the research inthis way. The production of varietiesin which gossypol secretionwould be inhibited before theseed germination should alleviatethe limitations associated to cottonby-products. [less ▲]

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See detailJatropha curcas in sub-saharian Africa: The big illusion ?
Mergeai, Guy ULg; Terren, Marieke ULg; Jacquet de Haveskercke, P. et al

Conference (2011)

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See detailEvaluation agromorphologique et sélection des meilleures accessions de Pourghère (Jatropha curcas L.) introduites au Bénin
Ahoton, L. E.; Quenum, F.; Mergeai, Guy ULg

in International Journal of Biological and Chemical Sciences (2011), 5(4), 1619-1627

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See detailInsecticidal effect of Jatropha curcas oil on the aphid Aphis fabae (Hemiptera: Aphididae) and on the main insect pests associated with cowpeas (Vigna unguiculata) in Niger
Abdoul Habou, Zakari; Haougui, A.; Mergeai, Guy ULg et al

in Tropicultura (2011), 29(4), 225-229

The insecticidal activity of Jatropha curcas has been evaluated on various crop pests. Oil concentrations of 0.5, 1, 2.5, 5, 10 and 15% were first tested on the black bean aphid (Aphis fabae Scop.) as ... [more ▼]

The insecticidal activity of Jatropha curcas has been evaluated on various crop pests. Oil concentrations of 0.5, 1, 2.5, 5, 10 and 15% were first tested on the black bean aphid (Aphis fabae Scop.) as part of an efficacy test conducted in the laboratory. During a second stage, the insecticidal efficacy of 5 and 7.5% oil concentrations was evaluated on the main pests infesting cowpea crops (Vigna unguiculata L.) as part of a field test conducted at the University of Niamey (Niger). The results obtained in the two tests demonstrate the biocidal effect of the treatments applied, which increases with the concentration. On the black bean aphid, the biocidal effect increases during the hours following the application of oil before reaching a peak after 4 days. On cowpeas, J. curcas oil concentrations of 5% and 7.5% make it possible to reduce the level of attack by aphids (Aphis craccivora) by 10 and 50% respectively compared to the control. A 50% and 75% fall in the number of thrips (Megalurothrips sjöstedti) and bugs (Anoplocnemis curvipes), respectively, can be observed under the same conditions. This treatment made it possible to greatly increase yields compared to the untreated control. [less ▲]

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See detailAmélioration du taux de multiplication in vitro de Jatropha curcas L.
Medza Mve, Samson Daudet ULg; Mergeai, Guy ULg; Baudoin, Jean-Pierre ULg et al

in Tropicultura (2010), 28(4), 200-204

In order to improve the in vitro multiplication rate (number of shoots/explant/subculture) of Jatropha curcas L. axillary nodes taken from young plants of two accessions of this species (originating from ... [more ▼]

In order to improve the in vitro multiplication rate (number of shoots/explant/subculture) of Jatropha curcas L. axillary nodes taken from young plants of two accessions of this species (originating from Cameroon and Senegal) have been cultivated for three weeks on a MS medium supplemented with 8,87 µM BAP, 4.92 µM IBA, and 30 g.l-1 sucrose at pH 5.7±0.1, and solidified with 0.7% agar. The shoots obtained from each original explant were then transferred to proliferation media (PM) consisting of MS medium supplemented with 2.21 to 8.9 µM BA or 2.21 to 8.9 µM kinetin in combination with 2.46 µM IBA. Each combination was completed with 33.12 µM adenine sulfate, 82.92 µM of glutamine and 30 g.l-1 sucrose. The best multiplication rate was obtained for the PM medium containing 6.65 µM BA and 2.46 µM AIB. On this medium 42.72±3.22 and 38.15±4.7 shoots/explant were obtained respectively for the accessions from Cameroon and Senegal after 6 weeks of culture, and the mean multiplication rates were 8.27±1.27 (accession from Cameroon) and 7.89±1.13 (accession from Senegal) shoots per explant during the 7 following subcultures (3 weeks/subculture). This medium was also the one that allowed the best overall growth in shoot height. Leafy shoots obtained have been rooted in a medium containing half of the major mineral components of MS supplemented with 5.7 µM IBA, 1.5% sucrose and solidified with 0.7% agar, then acclimated with a survival rate of 97%. These results allow considering the establishment of industrial units of plantlet multiplication from elite clones of J. curcas. [less ▲]

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See detailIdentification of chromosomal regions associated with segregation distortion of SSR markers and the genes controlling the low-gossypol seed & high-gossypol plant trait of Gossypium sturtianum
Benbouza, H.; Diouf, F.B.; Schefflers, J. et al

Conference (2010)

Distorted segregation of DNA markers is commonly encountered, especially in inter-specific crosses. Our main objective in this study was to identify chromosomal regions consistently associated with ... [more ▼]

Distorted segregation of DNA markers is commonly encountered, especially in inter-specific crosses. Our main objective in this study was to identify chromosomal regions consistently associated with segregation distortion in [(G. hirsutum x G. raimondii) x G. sturtianum] (HRS) hybrid. Segregation distortion skews the genotypic frequencies from their Mendelian expectations. In HRS progeny, chi square analysis (P < 0.01) showed significant skewed in all targeted linkage groups c2-c14, c3-c17, and c6-c25. Chromosomal region was regarded as being associated with skewed segregation, if three or more closely linked markers exhibited significant segregation distortion in one or more population(s). The targeted introgression regions in the tested population seem to be favourable for segregation distortion. Segregation distortion in HRS hybrid progenies differed in male and female gametes. Furthermore, the data indicated that the environment has strongly influenced the transfer of SSR markers through microspores. The consistent location of these chromosomal regions in selfed and backcross of HRS derivatives indicate probably the identification of segregation distortion regions (SDRs) in HRS hybrid. Comparison with results regarding the segregation distortion regions obtained in previous research by other authors and results we obtained regarding the absence of recombinations between BNL3436 and BNL1153 markers mapped on c6-c25 chromosome and spanned by 64 cM on the G. hirsutum map, after several generations of selfing, arise the question of the conservation of the gene order and spacing in G. sturtianum. Results showed that three SSR markers mapped on c6-c25 linkages groups were systematically transmitted in all selected progenies of the HRS tri-specific hybrid. Furthermore, the high percentages of loci with significant segregation distortion observed in this study suppose that a genetic mechanism may exist for preferential transmission of alien chromosomes segments. High heterozygosity frequencies (+/- 80%) were observed for all conserved G. sturtianum SSR markers, after several generations of backcrossing and selfing, which indicate that the cytogenetic and genetic conditions for obtaining homozygotes at high frequency are not met. [less ▲]

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See detailFertilité des sols, agriculture durable de conservation pour préserver la planète
Mergeai, Guy ULg; Aloni Komanda, Jules

in La voix du Congo profond, le magazine d'un congo rural en marche (2010)

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See detailEffect of groundnut cake substitution by glandless cottonseed kernels on broilers production: animal performance, nutrient digestibility, carcass characteristics and fatty acid composition of muscle and fat
Diaw, Mamadou Tandiang; Dieng, Abdoulaye; Mergeai, Guy ULg et al

in International Journal of Poultry Sciences (2010), 9(5), 473-481

A study has been conducted with broilers to assess, during the rainy season, the effects of groundnut cake substitution by glandless Cottonseed Kernel (CSK), at levels of 0, 25, 50 and 75%. The ... [more ▼]

A study has been conducted with broilers to assess, during the rainy season, the effects of groundnut cake substitution by glandless Cottonseed Kernel (CSK), at levels of 0, 25, 50 and 75%. The substitution improved linearly feed intake and animal growth, as well as carcass component weights and allometric parameters. The CSK increased the C18:2 n-6 to C18:1 n-9 ratio, as well in diet as in meat and subcutaneous fat. In order to explain the observed performances, the possibility is considered that broilers used preferentially C18:2 n-6 fatty acids for their metabolism. Complete glandless cottonseed kernels are probably highly valuable for broilers production in warm and wet conditions. [less ▲]

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See detailDevelopment of upland cotton plants highly resistant to the reniform nematode from the G. Hirsutum x G. Thurberi x G. Longicalyx hybrid
Mergeai, Guy ULg; Konan, N.O; Baudoin, Jean-Pierre ULg

in Proceedings of the beltwide cotton improvement conference (2010)

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See detailEffect of GammaRay in the Progeny of Trispecific Hybrid [(Gossypium hirsutum x G. raimondii)² x G. sturtianum]
Diouf, Fatimata Bintou Hassédine ULg; Benbouza, H; Konan, O et al

in Notulae Botanicae Horti Agrobotanici Cluj-Napoca (2010), 38

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See detailEffets de la substitution du tourteau d’arachide par la fève de coton conventionnel en production de poulet de chair au Sénégal
Diaw, Mamadou Tandiang; Dieng, Abdoulaye; Mergeai, Guy ULg et al

in Tropicultura (2010), 28(3), 139-147

A study has been conducted on 400 chicks to evaluate conventional cottonseed kernels on broilers production. Groundnut cake has been substituted by cottonseed kernels at 0, 25, 50 and 75% levels ... [more ▼]

A study has been conducted on 400 chicks to evaluate conventional cottonseed kernels on broilers production. Groundnut cake has been substituted by cottonseed kernels at 0, 25, 50 and 75% levels. Cottonseed kernel incorporation decreased significantly (p< 0.001) the growing parameters, feed intake, feed efficiency and nutrients digestibility of the experimental diets. This reduction was proportional to the level of substitution. The study suggests that only the level of gossypol in cottonseed kernels limits their incorporation in broilers diets and that this by-product should be excluded from the formulation in broilers production or that its level of incorporation should be limited to a maximal level of 10% when production duration is not a constraint for breeders. [less ▲]

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See detailMise au point d’un protocole de micropropagation in vitro de Jatropha curcas L
Medza Mve, Samson Daudet ULg; Mergeai, Guy ULg; Baudoin, Jean-Pierre ULg et al

in Biotechnologie végétales: amélioration des plantes et sécurité alimentaire» et par le réseau « Biotechnologies Végétales et Biosécurité » du projet SISTBiotechnologies et valorisation du patrimoine végétal sous-exploité en zone sahélienne et soudano-sahélienne (2009, November 14)

Jatropha curcas L. est considéré comme une source potentielle non-comestible pour la production de biocarburants (Sujatha et al, 2005). Sa multiplication par semis présente l’inconvénient de cultiver au ... [more ▼]

Jatropha curcas L. est considéré comme une source potentielle non-comestible pour la production de biocarburants (Sujatha et al, 2005). Sa multiplication par semis présente l’inconvénient de cultiver au champ des plantes hétérogènes, dont les graines présentent des contenus en huile qui varie de 4-40% (Heller, 1996). La présente étude vise la mise au point d’un protocole de multiplication massale de plantes élites à partir d’explants nodaux cultivés en conditions axéniques. [less ▲]

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See detailIN VITRO CLONAL PROPAGATION OF A PROMISING AGROFUEL PRODUCING-PLANT : JATROPHA CURCAS L.
Medza Mve, Samson Daudet ULg; Mergeai, Guy ULg; Baudoin, Jean-Pierre ULg et al

Poster (2009, June 13)

In the present investigation, in vitro clonal propagation of two-month-old Jatropha curcas L. was achieved employing nodal explants. Axillary shoot bud proliferation was best initiated on Murashige and ... [more ▼]

In the present investigation, in vitro clonal propagation of two-month-old Jatropha curcas L. was achieved employing nodal explants. Axillary shoot bud proliferation was best initiated on Murashige and Skoog’s (MS) basal medium supplemented with N6-benzyladenine (BA) and adenine sulphate. This medium allowed the production of 3.1 ± 0.5 shoots per nodal explant with 3.5 ± 0.8 cm average length after 3-4 weeks. [less ▲]

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See detailDevelopment of a protocol for micropropagation of Jatropha curcas L
Medza Mve, Samson Daudet ULg; Mergeai, Guy ULg; Baudoin, Jean-Pierre ULg et al

in Fifth International Conference on Renewable Resources and Biorefineries (2009, June 11)

In the present investigation, in vitro clonal propagation of two-month-old Jatropha curcas L. was achieved employing nodal explants. Axillary shoot bud proliferation was best initiated on Murashige and ... [more ▼]

In the present investigation, in vitro clonal propagation of two-month-old Jatropha curcas L. was achieved employing nodal explants. Axillary shoot bud proliferation was best initiated on Murashige and Skoog’s (MS) basal medium supplemented with N6-benzyladenine (BA) and adenine sulphate. This medium allowed the production of 3.1 ± 0.5 shoots per nodal explant with 3.5 ± 0.8 cm average length after 3-4 weeks. [less ▲]

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See detailEtablissement de plantations de Jatropha
Legendre, Bruno; Mergeai, Guy ULg; Terren, Marieke ULg

in Technologies for Human Development (2009)

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See detailÉlargissement de la base génétique de la principale espèce de cotonnier cultivé Gossypium hirsutum L. par la création et l’exploitation de lignées monosomiques d’addition
Sarr, D.; Mergeai, Guy ULg

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2009), 13(1), 187-201

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