References of "Tropicultura"
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See detailFactors of Variation of Soil Chemical Properties in Metalliferous Ecosystems of Tenke-Fungurume, Katanga, D. R. Congo
Kaya Muyumba, Donato ULiege; Ilunga wa Ilunga, Edouard; Faucon, Michel-Pierre et al

in Tropicultura (in press)

Our study aimed at deepen our understanding of relationships between soil properties and vegetation distribution in metalliferous ecosystems of Tenke-Fungurume in the Democratic Republic of Congo. The ... [more ▼]

Our study aimed at deepen our understanding of relationships between soil properties and vegetation distribution in metalliferous ecosystems of Tenke-Fungurume in the Democratic Republic of Congo. The first question concerned the differences and similarities between soils of the main vegetation units and four variation factors of soil properties were summarized by multivariate analysis. They were all linked to lithology and significantly contributed to explain the distribution of vegetation units. Our result suggest that the variation of soil properties which is observed within the various vegetation units (rocky steppe savanna, sward, and steppe savannas on slope or on Dembo) should partially be attributed to differences of geochemical composition of rocks between sites but the main source of variability is to be found inside each hill. The soil contamination in Cu and Co originates from rock weathering and besides site effect and topographic distribution of the rocks, the variability of soil properties within one vegetation unit may be due to variability of soil parent material and not only to erosion. The second question dealt with the changes of soil properties at small distances. Metric variation was studied from transects between adjacent vegetation units. Our results showed that the abrupt changes of vegetation units which were clearly identified on the field were all truly explained by the variations of one or more properties linked to lithology. The key point being the Cu bioavailability. [less ▲]

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See detailEffects of Opuntia ficus-indica on Growth Performance and Serum Parameters of Broiler Chicken in Algeria
Moula, Nassim ULiege; Humbel, Maïlis ULiege; Leterrier, Mélanie et al

in Tropicultura (2019), 37(1),

Thanks to the wide diversity of soil and climate, Algeria has a substantial number of plants which can be used in animal feed. This work is a part of the barbaric fig cladodes evaluation, widely present ... [more ▼]

Thanks to the wide diversity of soil and climate, Algeria has a substantial number of plants which can be used in animal feed. This work is a part of the barbaric fig cladodes evaluation, widely present in the Algerian rural landscape, as a broiler chicken feed supplement. The aims of this study are to measure the effects of Opuntia ficus-indica (OFI) powder on the growth performances, serum parameters and carcass characteristics of broiler chickens. The experiments were performed in a private poultry farm, located in the Chemini region. In this study, 120-Ross-308 days-old male chicks were monitored. They were divided into three groups according to the specific diet consumed (4 x 10 chicks by group). The group 1 was offered a commercial feed, while groups 2 and 3 received the same feed containing: 5% and 10% of OFI powder respectively. The OFI powder did not show any negative effect on the final body-weight, average daily gain and carcass characteristics. In contrast, it decreased (p < 0.05) some biochemical parameters in blood, like plasma glucose; uremia; cholesterol; and triglycerides. In conclusion, the OFI powder can be used as a potential additive in the commercial feed of broiler chickens which could efficiently reduce their cost sales in the Algerian market. [less ▲]

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See detailLes espaces verts en zone urbaine et periurbaine de Kinshasa en Republique Democratique du Congo
Sambieni, Kouagou Raoul ULiege; Useni, Sikuzani Yannick; Cabala, Kaleba Sylvestre et al

in Tropicultura (2018), 36(3), 478-491

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See detailImbrasia obscura, an Edible Caterpillar of Tropical Africa: Chemical Composition and Nutritional Value
Mabossy-Mobouna, Germain; Malaisse, François ULiege; Richel, Aurore ULiege et al

in TROPICULTURA (2018), Vol. 36, N° 4

The consumption of Imbrasia obscura (Butler, 1878) has been quoted in a dozen books and papers in five different countries, namely Cameroon, Central African Republic, Congo Republic, Democratic Republic ... [more ▼]

The consumption of Imbrasia obscura (Butler, 1878) has been quoted in a dozen books and papers in five different countries, namely Cameroon, Central African Republic, Congo Republic, Democratic Republic of Congo and Angola. This study presents, for the first time, information concerning two unknown subjects, the chemical composition and the nutritional value of the species. The chemical composition shows that it is a good source of proteins and lipids with the presence of five essential amino-acids (threonine, tyrosine + phenylalanine, histidine and tryptophan) and important amounts of essential fatty acids. The mineral elements such as calcium, phosphorus, magnesium and potassium are also present in good amounts. There is little sodium for which human consumption is frequently excessive. The very high proportion of alpha-linoleic acid contributes very significantly to the low ω-6/ω-3 ratio. Consequently, this caterpillar is a food that may be recommended for human consumption. Farming this species could be encouraged because of its high nutritional value and its good commercial potential especially in areas where malnutrition is common. [less ▲]

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See detailCaractérisation de la race ovine algérienne Tazegzawth
Moula, Nassim ULiege

in Tropicultura (2018), 36(1), 43-53

This paper aims at, firstly, highlighting the morpho-biometric characteristics of the Tazegzawth sheep breed, and, secondly, describing the sheep farmers profile and their farming practices. The study was ... [more ▼]

This paper aims at, firstly, highlighting the morpho-biometric characteristics of the Tazegzawth sheep breed, and, secondly, describing the sheep farmers profile and their farming practices. The study was carried out in Kabylie (Algeria) which is the breed cradle of Tazegzawth sheeps. The essay concerned 16 breed farmers located in the Wilayas of Bejaia and Tizi-Ouzou. Each of the 85 sheeps (24 rams and 61 ewes) was characterized and profiled. The study indicated that the sheep farming is a diversification activity and not a specialized activity. Other breeds and species are kept by the farmers. Due to the sharing of grazing areas between farmers, anarchic matings occurred contributing to the Tazegzawth breed’s decline. Farmers involved in this study were male having on average 12.13±3.84 livestock heads per household. All the farmers used local resources as supplement feeding: organic waste, crop leftovers, hay and olive foliage, ash, elm, oak and fig foliage. Average live weight of males (68.48±1.12 kg) were highly significantly higher (p-value <0.01) than the average live weight of females (53.84±1.16 kg). Livestock systems involving Tazegzawth breed showed high diversity. The multiple correspondences analysis indicated 4 groups depending on the time length over which animal breeding took place, the bred animal species, the number of Tazegzawth bred animals, and the aims and objectives of the animal farming. [less ▲]

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See detailCaractérisation de la croissance spatiale urbaine de la ville de Lubumbashi (Haut-Katanga, R.D. Congo) entre 1989 et 2014
Useni Sikuzani, Y; Cabala Kaleba, S; Halleux, Jean-Marie ULiege et al

in Tropicultura (2018), 36(1), 99-108

A quantification of the spatio-temporal dynamics of urbanization is crucial to apprehend urban morphology and its ecological effects, in order to support sustainable urban planning. This study aimed at ... [more ▼]

A quantification of the spatio-temporal dynamics of urbanization is crucial to apprehend urban morphology and its ecological effects, in order to support sustainable urban planning. This study aimed at understanding the spatial urban growth of Lubumbashi city based on the analysis of six SPOT satellites images. With the exception of the 1996-2002 period, Lubumbashi city underwent a high average annual growth rate exceeding that observed for other cities in sub-Saharan Africa. Between 1989 and 2014, the built-up percentage increased from 6% to 20%. Our results suggest that the urbanization of Lubumbashi city followed a complex diffusion-coalescence model. The main reason of this perturbation is the combination of the rapid demographic growth with an inappropriate urban growth management. © 2018, Agri-Overseas. [less ▲]

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See detailAnalyse prospectives des possibilités d'amélioration durable des performances des exploitations agricole de l'Ouest duBassin arachidier du Sénégal: cas des producteurs de jatropha (Jatropha curcas L.)
Camara, Abib ULiege; Dieng, Abdoulaye; Mergeai, Guy ULiege

in Tropicultura (2018), 36(4), 658-672

A survey was conducted with 65 family farms (FFs) cultivating Jatropha in the southwest of the Senegalese groundnut basin in order to understand their functioning and to identify sustainable agricultural ... [more ▼]

A survey was conducted with 65 family farms (FFs) cultivating Jatropha in the southwest of the Senegalese groundnut basin in order to understand their functioning and to identify sustainable agricultural innovations to improve their performances. The results obtained were the subject of a principal component analysis followed by a hierarchical ascendant classification. These analyses classified the FFs into four main types. Agricultural equipment and the type of livestock are the main factors discriminating them. Type I farms account for 6.1% of the total number. They own an average area of 27.5 ha, all agricultural traction implements and a large and diversified livestock. Type I is distinguished from type IV (10.8%) mainly by its larger livestock. Type II (30.8%) consists mainly of farmers who own an average area of 5.3 ha, without any draft animals or agricultural traction equipment. Farms of this type are often in a very precarious situation and their survival is threatened. Type III farms (52.3%) own an average area of 9.4 ha and a herd of donkeys and small ruminants. Two major types of cropping systems based on peanut / millet rotation and millet monoculture with low intake of organic manure are found in all surveyed farms. These are generally characterized by an extensive and low performing livestock system. Synergies between livestock and plant productions are poorly developed within farms. The prospects for improving the performances of the main types of FF identified are discussed. [less ▲]

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See detailLes statuts morphologiques d'urbanisation des communes de Kinshasa en Republique Democratique du Congo
Sambieni, Kouagou Raoul ULiege; Messina Ndzomo, J.-P.; Biloso Moyene, A. et al

in Tropicultura (2018), 36(3), 520-530

Cet article met en évidence la forte présence de la périurbanisation à Kinshasa par la caractérisation de son gradient urbain-rural. A partir de l’observation de la morphologie d’urbanisation sur Google ... [more ▼]

Cet article met en évidence la forte présence de la périurbanisation à Kinshasa par la caractérisation de son gradient urbain-rural. A partir de l’observation de la morphologie d’urbanisation sur Google Earth de 34035 mailles carrées de 25 ha chacune, couvrant toute l’étendue de la ville, nous avons réalisé une typologie de ses communes suivant le gradient urbain-rural. Nous avons également étudié l’évolution de la densité de population des différentes zones identifiées. Les résultats renseignent que Kinshasa compte actuellement 15 communes à statut urbain, 4 à statut périurbain et 5 à statut rural. La superficie cumulée des zones périurbaines et rurales représente plus de 96 % de la superficie totale de la ville démontrant le fort potentiel du phénomène de périurbanisation. Nous observons par ailleurs, une tendance de densification dans toutes les zones du gradient urbain-rural avec une situation densimétrique intermédiaire en zone périurbaine. Cette étude offre des données et un cadre théorique pour alimenter des études d’impacts environnementaux à propos de l’urbanisation et pour orienter la planification et l’aménagement des espaces périurbains et ruraux à Kinshasa. [less ▲]

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See detailInventaire Préliminaire de la faune lombricienne dans la Réserve et Domaine de Chasse de Bombo-Lumene, Plateaux Batéké (République Démocratique du Congo)
Milau, fils; Lemtiri, Aboulkacem ULiege; Mungyeko, M et al

in Tropicultura (2018), 36(1), 3-10

La macro faune du sol est régulièrement mise en avant pour son rôle sur les caractéristiques physiques et chimiques du sol, notamment des terres cultivées. De plus, la fréquence du travail du sol et l ... [more ▼]

La macro faune du sol est régulièrement mise en avant pour son rôle sur les caractéristiques physiques et chimiques du sol, notamment des terres cultivées. De plus, la fréquence du travail du sol et l'intensité de l'exploitation culturale sont des facteurs importants à prendre en compte dans la gestion des sols agricoles. Le présent inventaire vise à étudier l'impact du changement d'usage des sols sur la faune lombricienne. Il présente la diversité et l'abondance des espèces de lombriciens dans des écosystèmes savanicoles et forestiers de la Réserve et Domaine de Chasse de Bombo-Lumene des plateaux Batéké en République Démocratique du Congo. A cet effet, six types d'environnements ont été explorés: les forêts denses semi-décidues, les galeries forestières, les recrûs forestiers, les savanes herbeuses, les savanes arborescentes, et les cultures. Les espèces lombriciennes récoltées sont présentées en fonction du biotope, du régime alimentaire, du type de prostomium et de la distribution géographique. [less ▲]

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See detailLa contribution des camps de déplacés à la dynamique paysagère au sud et au sud-est du Burundi
Havyarimana, F.; Bamba, I.; Barima, Y. S. S. et al

in Tropicultura (2018), 36(2), 243-257

Nowadays, tropical zones are characterized by a catastrophic decline of forest ecosystems areas which play however an important role in climate regulation and biodiversity conservation. There are numerous ... [more ▼]

Nowadays, tropical zones are characterized by a catastrophic decline of forest ecosystems areas which play however an important role in climate regulation and biodiversity conservation. There are numerous and complex causes of deforestation. Even if agriculture is one of the main causes of deforestation in most tropical regions, sub-Saharan Africa had exceptional influences related to social conflicts. In Burundi, socio-political instability which occurred in 1993 also led to massive waves of displaced people, essentially farmers. The present study aims to analyze the land cover spatiotemporal dynamics and focuses particularly on the influence of this population forced to migrate. The study combines satellite images analysis with field observations to analyze land cover dynamic in the camp's surrounding zone. The negative impact of the socio-political instability has been demonstrated by vegetation anthropization decrease when the distance from the camps increases. The greatest anthropogenic pressure which is observed during the period that followed the outbreak of the socio-political instability also confirms this negative impact. The rehabilitation of those deforested or degraded zones is therefore essential. © 2018 Agri-Overseas. [less ▲]

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See detailDynamique des écosystèmes forestiers de l'Arc Cuprifère Katangais en République Démocratique du Congo. I. Causes, transformations spatiales et ampleur
Cabala Kaleba, Sylvestre; Useni Sikuzani, Yannick; Sambieni, Kouagou Raoul ULiege et al

in Tropicultura (2017), 35(3), 192-202

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See detailDynamique des écosystémes forestiers de I'Arc Cuprifére Katangais en République Démocratique du Congo. I. Causes, transformations spatiales et ampleur
Kaleba, S. C.; Sikuzani, Y. U.; Sambieni, Kouagou Raoul ULiege et al

in Tropicultura (2017), 35(3), 192-202

The socio-economic development resulting from the emergence of the mining sector in the Democratic Republic of the Congo causes significant changes in the natural ecosystems. The objective of this study ... [more ▼]

The socio-economic development resulting from the emergence of the mining sector in the Democratic Republic of the Congo causes significant changes in the natural ecosystems. The objective of this study was to evaluate, the deforestation patterns in the Katangese Copper Belt (K.C.B.) caused by the proliferation of mining sites and urban areas using the Landsat images of 2002 and 2015. A 10 km x 10 km square grid was applied to calculate landscape metrics for forest pattern analysis. The results obtained within the K.C.B. show that, the relative area of forests decreases from 49% to 42% between 2002 and 2015. Most squares are characterized by an increase in the number of forest patches and by a reduction of the forest area. Dissection was identified as the dominant spatial transformation process governing the forest cover dynamics. Other processes observed related to anthropogenic effects in landscapes were the suppression and the fragmentation. Aggregation, creation and enlargement dominate those squares situated in private concessions or in which forest conservation initiatives are developed. A link between the overall forest cover declining and the development the urban areas and the mining sites has been mapped. This study can serve as a conceptual framework for the application of policies oriented towards a more sustainable conservation of the Katangese forests, hence inversing the current trends. [less ▲]

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See detailVingt-cinq ans de monitoring de la dynamique spatiale des espaces verts en réponse á ('urbanisation dans les communes de la ville de Lubumbashi (Haut-Katanga, R.D. Congo)
Sikuzani, Y. U.; Kaleba, S. C.; Khonde, C. N. et al

in Tropicultura (2017), 35(4), 300-311

This study assessed the spatial-temporal dynamics of green spaces in response to urban growth for the seven municipalities of Lubumbashi city, Democratic Republic of the Congo between, 1989 and 2014 ... [more ▼]

This study assessed the spatial-temporal dynamics of green spaces in response to urban growth for the seven municipalities of Lubumbashi city, Democratic Republic of the Congo between, 1989 and 2014. Pattern analysis revealed that since 1989, the built-up proportion has gradually increased in all municipalities at the expense of green space area as a result of rapid demographic pressure coupled with a lack of an appropriate program for their preservation. In terms of pattern dynamics, green space extent has been dominated by attrition, fragmentation and dissection processes. This is opposed to creation and aggregation which characterized built-up areas. Our observations emphasize the need for a sustainable management of green spaces that takes into account the socio- economic context of each municipality. [less ▲]

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See detailLe rayon de déforestation autour de la ville de Lubumbashi (Haut-Katanga, R.D. Congo): Synthèse
Sikuzani, Y. U.; Malaisse, François ULiege; Kaleba, S. C. et al

in Tropicultura (2017), 35(3), 215-221

The Miombo woodland is a type of vegetation widely distributed in Zambezian Africa where it provides timber and non-timber forest products to millions of inhabitants. In Lubumbashi, the causes of its ... [more ▼]

The Miombo woodland is a type of vegetation widely distributed in Zambezian Africa where it provides timber and non-timber forest products to millions of inhabitants. In Lubumbashi, the causes of its degradation, supported by rapid population growth, are mainly: (i) agricultural development, (ii) charcoal production, (Hi) urban expansion, and (iv) mining activities. We present a meta-analysis of the studies that have defined the deforestation radius around Lubumbashi. This radius, used both to express the area (circular area), intensity and the magnitude (distance to the city) of deforestation, was determined through in situ charcoal production and remote sensing. Although the city's ecological footprint is illustrated, estimates of the resulting deforested area do not appear to be consistent because of the variability of methodological protocols within and between approaches. While studies focusing on charcoal production suggest complete Miombo woodland suppression around the city, those based on remote sensing mention the persistence of Miombo patches relatively close to the city and sometimes confuse the different levels of miombo degradation. These observations prevent the development of an appropriate policy for the conservation and sustainable use of the concerned ecosystem. [less ▲]

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See detailModélisation de la dynamique du paysage forestier de la Réserve Speciale d'Ambatovaky (Nord-Est de Madagascar)
Rakotondrasoa, L. O.; Malaisse, François ULiege; Bogaert, Jan ULiege

in Tropicultura (2017), 35(4), 312-324

Madagascar shelters a unique biodiversity that faces numerous threats, such as human activities, which cause deforestation. The objective of this study was to identify the landscape forest's dynamics of ... [more ▼]

Madagascar shelters a unique biodiversity that faces numerous threats, such as human activities, which cause deforestation. The objective of this study was to identify the landscape forest's dynamics of the Reserve Speciale d'Ambatovaky (RSA) from 1996 to 2050 based upon a first order Markov chain model. For this purpose, LANDSAT images of 1996, 2004 and 2014 were used to compose the land cover maps. A transition matrix made it possible to simulate the composition of the landscape until 2050. The results showed that the forest area of RSA decreased and is substituted by a secondary formation called "savoka" that appears several years after the end of agricultural activities. Slash-and-burn agriculture, called locally "tavy", is a common practice of farmers in the coastal areas of Madagascar. Tavy is the main reason for the decline of the forest area. [less ▲]

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See detailInventaire et disponibilité des produits forestiers non-ligneux utilisés par les populations riveraines de la Forêt Classée du Haut-Sassandra après la période de conflits armés en Côte d'lvoire
Kouakou, K. A.; Barima, Y. S. S.; Zanh, G. G. et al

in Tropicultura (2017), 35(2), 121-136

This study aims at identifying and assessing the plant species, apart from timbers, that can be found inside the Classified Forest of Haut-Sassandra (CFHS) and around after, the civil war in Ivory Coast ... [more ▼]

This study aims at identifying and assessing the plant species, apart from timbers, that can be found inside the Classified Forest of Haut-Sassandra (CFHS) and around after, the civil war in Ivory Coast. Investigations were carried out in 45 riverside resident households by individual and focus group interviews regardless the gender. One hundred and thirty-four plant species and 3 fungal species belonging to 56 families have been listed. Seven categories of uses of NTFP have been identified, among which medicinal use is the most important. Ten preferential plant species for rural population have been identified. The population stated that 45% of the NTFP have become rare in the area. The harvested NTFP are mainly for self-consumption. Farmers preserve and domesticate some plant species in their field. Faced with the scarcity of NTFPs, the use of manufactured goods is increasingly recurrent in the villages. [less ▲]

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See detailParadoxal agriculture or the art of producing more while using less
Mergeai, Guy ULiege

in Tropicultura (2017), 35(2), 71-72

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See detailThe forest spatial dynamics in the Bururi forest nature reserve, Burundi [La dynamique spatiale de la foret situee dans la reserve naturelle forestiere de Bururi au Burundi]
Havyarimana, F.; Masharabu, T.; Kouao, J. K. et al

in Tropicultura (2017), 35(3), 158-172

The studied forest is a protected area located in Southern Burundi, close to Bururi city and to agricultural villages. The effective protection of this forest started in 1980 but the protected area ... [more ▼]

The studied forest is a protected area located in Southern Burundi, close to Bururi city and to agricultural villages. The effective protection of this forest started in 1980 but the protected area delimitation occurred in 2000. The forest spatial dynamic is analyzed to assess the effectiveness of this protection status. The study combines six Landsat multispectral satellite images analysis with field observations. Forest area and perimeter analysis highlights its dynamic in two phases: the first one is mainly characterised by deforestation and savannah development around agricultural lands but also by forest regrowth processes between 1986 and 2001. The second phase (2001-2011) of the forest dynamic is characterized by the increase of its surface and perimeter following the transformation of savannah zones. The anthropogenic effect limitation linked to the protected area delimitation, agricultural activities disturbance during socio-political instability period and to the increasing number of forest-rangers, would have influenced the surface and perimeter gain between 2001 and 2011. Local population implication in forest protection could further limit human pressure and promote degraded zones regeneration. Thus, agropastoral practices innovation in neighboring villages of the protected zone could contribute to limit these anthropogenic disturbances. [less ▲]

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See detailEffects of defatting combined or not to heating of Jatropha curcas kernel meal on feed intake and growth performance in broiler chickens and chicks in Senegal
Nesseim, Thierry ULiege; Dieng, Abdoulaye; Mergeai, Guy ULiege et al

in Tropicultura (2017), 35(3), 149-157

Jatropha curcas is a tropical drought-resistant plant belonging to the Euphorbiaceae family that has gained importance for the production of biodiesel. The kernel of the seed contains approximately 55 ... [more ▼]

Jatropha curcas is a tropical drought-resistant plant belonging to the Euphorbiaceae family that has gained importance for the production of biodiesel. The kernel of the seed contains approximately 55% lipid in dry matter and the meal obtained could be an exceptional source of protein for family poultry farming, after treatments to remove toxic and anti-nutritional compounds. The ingestion and the growth performance of J. curcas kernel meal (JKM), obtained after partial physico chemical de-oiling combined or not with heating was evaluated in broiler chickens and chicks. Sixty unsexed broiler chickens, 30 day-old, divided into three groups as well as twenty broiler chicks, 1 day-old, divided into two groups were obtained for two experiments. In experiment 1, jatropha kernel was de-oiled and incorporated into a control fattening feed at 40 and 80g/kg (diets 4JKM1 and 8JM1). In experiment 2, jatropha kernel meal obtained in experiment 1 was heat treated and incorporated into a growing diet at 80g/kg (diet 8JKM2). Daily dietary intakes as well as weight gain of the animals were affected by the incorporation of jatropha kernel meal in the ration. In experiment 1, average daily feed intake (ADFI1) of 139.2, 55.2 and 23.4g/day/animal and also average daily weight gain (ADWG1) of 61.9, 18.5 and -7.7g/animal were obtained respectively for the groups fed with diets 0JKM1, 4JKM1 and 8JKM1. In experiment 2, Average daily feed intake (ADFI2) of 18.7 and 3.1g/day/animal and also average daily weight gain (ADWG2) of 7.1 and 1.9g/animal were obtained respectively for the groups fed with diets 0JKM2 and 8JKM2. In both experiment, feed conversion ratio (FCR) was also affected by the dietary treatments and the overall mortality rate showed an increase according to levels of jatropha kernel meal in diet. Keywords: broiler chickens, broiler chicks, Jatropha curcas, ingestion, growth performance [less ▲]

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See detailAppropriate Technologies : a solution to the Energy Shortage in Sub-Saharan Africa
Mergeai, Guy ULiege

in Tropicultura (2017), 35(1), 1-2

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