Agricultural and Veterinary Sciences

Permanent URI for this collection

https://nru.uncst.go.ug/handle/123456789/117

Browse

Now showing 1 - 20 of 1472

Response surface methodology directed modeling of the biosorption of progesterone onto acid activated Moringa oleifera seed biomass: Parameters and mechanisms
(Elsevier Ltd, 2024-05) Emily Ngeno; Roselyn Ongulu; Victor Shikuku; Deo Ssentongo; Benton Otieno; Patrick Ssebugere; Francis Orata
In this study, chemically activated fat-free powdered Moringa oleifera seed biomass (MOSB) was synthesized, characterized, and utilized as a cost-effective biosorbent for the abstraction of progesterone (PGT) hormone from synthetic wastewater. Natural PGT is a human steroid hormone from the progestogen family. Synthetic PGT is approved for the regulation of the menstrual cycle, aiding contraception, and is administered as a hormone replacement therapy in menopausal and post-menopausal women. PGT is an endocrine disrupting chemical (EDC) with negative health impacts on biota. The X-ray diffractogram (XRD), Scanning electron microscopy Energy-dispersive X-ray spectroscopy (SEM-EDS), and Brunauer–Emmet–Teller (BET) analyses displayed a porous, amorphous biosorbent with an elemental composition of 72.5% carbon and 22.5% oxygen and a specific surface area of 210.0 m2 g− 1 . The process variables including temperature (298–338 K), pH (2–10), contact time (10–180 min), adsorbate concentration (20–500 μg L− 1 ), and adsorbent dosage (0.1–2.0 g) were optimized using response surface methodology (RSM) to obtain the greatest efficacy of MOSB during biosorption of PGT. The optimum parameters for PGT biosorption onto MOSB were: 86.8 min, 500 μg L− 1 adsorbate concentration, 298 K, and 0.1 g adsorbent dosage. PGT removal from aqueous solutions was pH-independent. The Langmuir isotherm best fitted the equilibrium data with maximal monolayer biosorption capacity of 135.8 μg g− 1 . The biosorption rate followed the pseudo-first-order (PFO) kinetic law. The thermodynamic functions (ΔG < 0, ΔH = − 9.258 kJ mol− 1 and ΔS = +44.16 J mol− 1 ) confirmed that the biosorption of PGT onto MOSB is a spontaneous and exothermic process with increased randomness at the adsorbent surface. The biosorption mechanism was physisorption and was devoid of electrostatic interactions. The findings from this study indicate that MOSB is an inexpensive, low-carbon, and environmentally friendly biosorbent that can effectively scavenge PGT from aqueous solutions.
Investigation into radioactivity levels in soil samples from wheat cultivation sites in Kapchorwa district Uganda
(Springer International Publishing, 2024-05) Sead, Sead Mohamed; Uzorka, Afam; Olaniyan, Ademola Olatide
Abstract Using a NaI(Tl) gamma ray spectrometer, the activity concentrations of three natural radionuclides, 238U, 232Th, and 40K, were assessed for soil samples taken from various locations within the Kapchorwa district wheat plantation region. The average values found for 238U, 232Th, and 40K are 47.8±4.1 Bqkg−1, 61.0±3.8 Bqkg−1, and 1339.05±65.3 Bqkg−1, respectively, all of which were above world average values. Radiological health hazard indices were calculated, including radium equivalent activity, absorbed dose rate, annual efective dose equivalent, external and internal health hazard indices, as well as gamma and alpha indices. The fndings revealed that the annual efective dose equivalent (HR) and absorbed dose rate (DR) are respectively 0.58±0.03 mSvy−1 and 118.1±7.7 nGyh−1, and the mean value of radium equivalent activity is 246.9±10.4 Bqkg−1. The gamma and alpha health hazard indices have values of 0.93±0.05 and 0.25±0.02, respectively, whereas the external and internal health hazard indices have values of 0.66±0.04 and 0.79±0.04, respectively. The fndings showed that although the soil’s radioactivity levels were higher than acceptable limits established by international standards, the computed hazard indices were lower than acceptable limits established by international standards, indicating a low risk of radiation contamination in the region. Important information about the natural radioactivity levels in agricultural soils and their efects on the environment and public health in Kapchorwa District and surrounding areas is provided by this study.
Impact of temperature on the bionomics and geographical range margins of the two-spotted field cricket Gryllus bimaculatus in the world: Implications for its mass farming
(Public Library of Science, 2024-04) Magara, Henlay J. O; Tanga, Chrysantus M; Fisher, Brian L; Azrag, Abdelmutalab G. A; Niassy, Saliou; Egonyu, James P; Hugel, Sylvain; Roos, Nana; Ayieko, Monica A; Sevgan, Subramanian; Ekesi, Sunday
Gryllus bimaculatus (Orthoptera: Gryllidae) is widely considered an excellent nutrient source for food and feed. Despite its economic importance, there is limited information on the impact of temperature on the bionomics of this cricket to guide its effective and sustainable mass production in its geographical range. The biological parameters of G . bimaculatus were investigated at eight different temperatures ranging from 20–40˚C. The Insect Life-Cycle Modelling (ILCYM) program was used to fit linear and non-linear functions to the data to describe the influence of temperature on life history parameters and its farmability under the current and projected climate for 2050. Our results revealed that G . bimaculatus was able to complete its lifecycle in the temperature range of 20°C to 37°C with a maximum finite rate of population increase (= 1.14) at 35°C. The developmental time of G . bimaculatus decreased with increasing temperature. The least developmental time and mortality were attained at 32°C. The highest wet length and mass of G . bimaculatus occurred at 32°C. The lowest temperature threshold for G . bimaculatus egg and nymph development was approximated using linear regression functions to be at 15.9°C and 16.2°C with a temperature constant of 108.7 and 555.6 degree days. The maximum fecundity (2301.98 eggs per female), net reproductive rate (988.42 daughters/ generation), and intrinsic rate of natural increase (0.134 days) were recorded at 32°C and the shortest doubling of 5.2 days was observed at 35°C. Based on our findings G . bimaculatus can be farmed in countries with temperatures ranging between 20 and 37°C around the globe. These findings will help the cricket farmers understand and project the cricket population dynamics around the world as influenced by temperature, and as such, will contribute to more efficient farming.
Entering the Digital Research Age: Investigating the Effectiveness of Visual Digital Tools in Agricultural Research
(SAGE Publications, 2024-05) Kawerau, Laura; Birkenberg, Athena; Daum, Thomas; Butele, Cosmas Alfred; Birner, Regina
Agricultural studies mainly rely on quantitative research approaches. Despite growing interest in and uptake of qualitative, participatory, and visual methods due to their perceived advantages in gathering in-depth information and empowering participants, visual–digital research methods have yet to be largely applied. In our study on adaptation strategies to climate change among smallholder farmers in Uganda we compared different data collection methods, including: semi-structured interviews with manual note-taking, participatory impact diagrams, and adapted photovoice and cellphilm methodologies.
Biochar dispersion in a tropical soil and its effects on native soil organic carbon
(Public Library of Science, 2024-04) Obia, Alfred; Lyu, Jing; Mulder, Jan; Martinsen, Vegard; Cornelissen, Gerard; Smebye, Andreas Botnen; Zimmerman, Andrew R
Although biochar application to soils has been found to increase soil quality and crop yield, the biochar dispersion extent and its impacts on native soil organic carbon (SOC) has received relatively little attention. Here, the vertical and lateral migration of fine, intermediate and coarse-sized biochar (<0.5, 0.5–1 and 1–5 mm, respectively), applied at low and high doses (1.5–2 and 3–4% w/w, respectively), was tracked using stable isotope methods, along with its impact on native SOC stocks. Biochar was homogeneously mixed into the surface layer (0–7 cm depth) of a loamy sandy Acrisol in Zambia. After 4.5 y, 38–75% of the biochar carbon (BC) was lost from the applied layer and 4–25% was detected in lower soil layers (7–30 cm). Estimating BC mineralization to be no more than 8%, 25–60% was likely transported laterally out of the experimental plots. This conclusion was supported by observations of BC in the control plot and in soils up to 2 m outside of the experimental plots. These processes were likely progressive as recovery of BC in similar plots 1 year after application was greater in both surface and lower soil layers than after 4.5 y. Fine and intermediate-sized BC displayed the greatest downward migration (25.3 and 17.9%, respectively), particularly when applied at lower doses, suggesting its movement through soil inter-particle spaces. At higher dosages, fine and intermediate-sized particles may have clogged pore, so coarse biochar displayed the greatest downward migration when biochar was applied at higher doses. In the BC treatment plot soil profiles, native SOC stocks were reduced by 2.8 to 24.5% (18.4% on average), i.e. positive priming. However, some evidence suggested that the soils may switch to negative priming over time. The dispersion of biochar in soil should be considered when evaluating biochar’s agronomic benefits and environmental effects.
Transitioning opportunities for sub-Saharan Africa’s small-scale urban pig farming towards a sustainable circular bioeconomy
(Taylor & Francis Group, 2024-02-27) Rebecca Mmamakgone Mathobela; Annelin Henriehetta Molotsi; Munyaradzi Chris Marufu; Phillip Evert Strydom; Cletos Mapiye
Abstract ABSTRACTSmall-scale urban pig farming (SUPF) in sub-Saharan Africa (SSA) contributes to food, nutrition, income and social security of indigent urbanites but is associated with animal, human and environmental health risks. In this context, it is critical to identify key strategies to optimize the benefits and minimize the risks of SUPF in SSA. The current review identifies a set of existing management practices that synchronously enhance sustainability and circularity of SUPF and explore factors influencing the capacity of farmers to adopt such practices. The review demonstrates that there is a multitude of opportunities for enhancing the sustainability and circularity of SUPF in SSA through application of sustainable and circular economy practices (SCEPs) in housing, feeding, breeding, health, marketing and waste management. However, these opportunities can only be fully realized if appropriate urban planning, by-laws, and policies are implemented, and socio-economic, psychological and institutional factors, private-public partnerships and international corporations that promote widespread application of SCEPs are holistically integrated into decision-making processes of the relevant stakeholders. Research should continuously focus on identifying SCEPs adopted by farmers and incorporating their adoption predictors in decision-making. This has the potential to transition SUPF in SSA towards a more sustainable and circular food system.
Determinants of adoption of sustainable agricultural practices among maize producers in Northern Uganda
(Taylor & Francis Group, 2023-12-13) Midamba, Dick Chune; Kwesiga, Mary; Ouko, Kevin Okoth
Abstract AbstractSustainable agricultural practices (SAPs) increase crop productivity. This is achieved by increasing soil fertility, preserving moisture in the soil, and reducing pest and disease build-up, among other significant roles. Strikingly, maize farmers are still deeply rooted into the traditional methods of production which do not consider the adoption of SAPs. As such, they report low maize yields. Similarly, despite government efforts to increase the adoption rate, farmers remain reluctant to adopt SAPs. Therefore, this study aims to determine the adoption intensity of SAPs and its determinants using data collected from 101 randomly selected farmers in Northern Uganda. The adoption index (AI) and Tobit model approaches were used to determine the adoption intensity and its determinants, respectively. Based on the results, adoption intensity stood at 70%, while the determinants of adoption of the selected SAPs were education level (P < 0.05), household size (P < 0.05), farm size (P < 0.01), ICT use (P < 0.05), access to market information (P < 0.01), extension visits (P < 0.05), and credit access (P < 0.10). The study recommended that smallholder farmers’ use of ICT in accessing information on the adoption of SAPs among other agricultural information, strengthening adult literacy programs, increasing extension visits, and encouraging farmers to access credit from low interest rates financial institutions would help in increasing the level of adoption of SAPs.
The role of agro-input dealer certification in promoting sustainable pest control: insights from Uganda
(Taylor & Francis Group, 2024-01-05) Tambo, Justice A; Holmes, Keith A.; Aliamo, Caroline; Mbugua, Fredrick; Alokit, Christine; Muzira, Fred; Byamugisha, Andrew; Mwambu, Paul
ABSTRACTPesticides are crucial for increasing agricultural productivity, but they have also beenlinked to a range of health and environmental risks. In this paper, we used nationallyrepresentative data from 557 agro-dealers in Uganda to assess the role of agro-dealercertification in improving knowledge and practices related to environmentally-friendly pest control. We found that almost half of the sampled agro-dealers werenot certified or accredited by regulatory bodies, even though this is a prerequisitefor selling pesticides in the country. Results further showed that only 16% of theagro-input shops were selling biopesticide products, largely due to a lack ofawareness, access and demand from farmers. Regression results showed thatcertified agro-dealers were 9–12 percentage points more likely to know aboutbiopesticides and integrated pest management, and 8–10 percentage points morelikely to sell biopesticide products, compared to their non-certified counterparts.Ourfindings imply that agro-dealer certification courses can play an important rolein raising knowledge and stimulating the supply of environmentally-benign pestcontrol products. We identified regulatory enforcement, a decentralizedcertification system and agro-dealer associations as some of the potentialpathways for incentivising compliance with certification requirements, therebypromoting lower-risk pest control products and strategies
Physico-chemical and microbiological quality of raw milk produced by smallholder farmers in Gulu City, Northern Uganda
(Taylor & Francis, 2024-01-27) Opiyo, Alfred; Kidega, Kenneth; Okello-Uma, Ipolto; Olum, Solomon
Abstract AbstractSmallholder dairy farmers in Northern Uganda sell raw milk to the final consumers without conducting quality control measures. This study evaluated physico-chemical and microbiological quality of milk produced by smallholder farmers in Gulu City. Samples of raw milk were collected from forty (40) smallholder dairy farmers rearing lactating exotic breed of dairy cows (Holstein Friesian) in zero grazing units and eight (8) from milk collection centers. Data were analyzed in SPSS software (version 21.0) by employing descriptive statistics, one-way ANOVA and t-test to separate significant means at 5% level of significance. Significant (P < 0.05) differences were observed in the content of solid-not-fat (SNF), specific gravity, pH value, lactic acid, Coliform count and total plate count of colony forming unit among four divisions in Gulu City. There was no discernible (p > 0.05) difference in protein as well as fat content for milk sampled from the study divisions. In conclusion, smallholder dairy farmers in Gulu City conduct limited recommended key practices for raw milk production leading to compromised microbiological and physico-chemical quality. Further research is needed on in-depth analysis of the different species of micro-organisms in raw milk from both local and exotic breeds of dairy cattle under the smallholder farming system in Northern Uganda.
Influencers of leadership styles used by farmer organisations in Uganda
(Taylor & Francis, 2024-01-23) Racheal, Nangobi; Mlongo, Mshenga Patience; Basil, Mugonola
Abstract AbstractAlthough leadership determines the performance of farmer organizations, the leadership styles used by farmer organizations in Uganda and factors influencing such styles have received limited attention in empirical studies. The available studies have focused mainly on the influence of leadership on performance, effectiveness, accountability, and transparency. This study determined: (1) leadership styles used by farmer organizations in Uganda; (2) differences in farmer organizational characteristics across the styles; and (3) factors that influence such styles. This study contributes to the understanding of leadership styles used by farmer organizations in Uganda and the factors that influence the choice of such styles. In order to collect quantitative data, a cross-sectional survey of 272 systematically selected farmer organizations was conducted in 12 districts of central and northern Uganda. 59.56% of farmer organizations used both democratic and autocratic leadership styles, according to the findings. Furthermore, savings and loan scheme, leadership passion, farm management training, leadership and management training, leaders’ expertise, and leadership committee numbers varied across leadership styles. The logit results showed that the savings scheme, number of organizational departments, leadership passion, usage of market outlets, total costs, and leadership and management training influenced the use of both democratic and autocratic leadership styles. However, the use of solely the democratic leadership style was influenced by committee size, total income, and value-added training. Farmer organizations should continue to use both democratic and autocratic leadership styles for efficiency and effectiveness. Governments and other development partners should strengthen leadership and management training for farmer organizational leaders.
Ingestion exposure and committed health risk of natural radioactivity and toxic metals in local rice sold in Enugu urban markets
(Taylor & Francis, 2024-04) Ugbede, Fredrick Oghenebrorie; Akpolile, Anita Franklin; Oladele, Blessing Bosede; Agbajor, Godwin Kparobo; Popoola, Felix Adegoke
Abstract Rice (Oryza sativa) is an important source of human internal exposure to radionuclides and heavy metals because, worldwide, a large fraction of the population consume rice as their daily basic diet. In this study, the levels and correlation of natural radioactivity (232Th, 226Ra and 40K) and heavy metals (Pb, Ni and Cd) in local rice sold in Enugu urban markets, a southeastern part of Nigeria, were examined. Possible health implications were also evaluated. The mean activity concentrations were estimated to be 235.81 ± 12.93, 54.29 ± 8.08 and 63.70 ± 3.93 Bqkg−1 for 40K, 226Ra and 232Th respectively. Obtained values were higher than values reported in the literature for rice in other locations. The estimated committed effective doses for 226Ra and 232Th exceeded the global ingestion dose average of 0.12 mSvy,–1 whereas that of 40K is below the 0.17 global average. The average concentrations of the metals were estimated to be 0.41, 3.70, and 0.02 mgkg–1 for Pb, Cd and Ni, respectively, with only Ni having an average concentration below the threshold food safety limit of FOA/WHO. Only the concentrations of Cd were of significant levels with their health risk indices exceeding the tolerable reference levels for both children and adult. Only the pairs, 232Th-Ni and Pd-Cd, correlated significantly (p < 0.05) which implies common sources. Multivariate principal component analysis indicated common natural sources for 226Ra, 232Th and Ni in local rice, possibly of lithogenic and paedogenic in nature. It is believed that the results of this study will be valuable to the radiological and toxicological food safety and policy framework of WHO/FAO in Nigeria and the rest of the world. Aquatic Science & Fisheries Abstracts (ASFA) Professional
Dataset on the geographical distribution of species of the genus Solanum, subgenus Leptostemonum in Uganda
(Elsevier Inc, 2024-04) Kauma, Carol Mere; Anywar, Godwin; Serunjogi, Derick; Katuura, Esther; Namaganda, Mary
Abstract The dataset includes the diversity, occurrence points and a distribution map of species of the subgenus Leptostemonum in Uganda. The data was obtained following field surveys carried out in various parts of Uganda. These were guided by distribution data retrieved from Makerere University Herbarium and Flora of Tropical East Africa (FTEA). At each sampling site, species name, altitude and habitat type were recorded. Occurrence points were geocoded using a hand-held GPS (a ≤ 5M Germin S90 GPS). The distribution map was generated using ArcMap 10.7.1 software. The dataset consists of 172 occurrence points representing 18 species of subgenus Leptostemonum that occur in Uganda. The data can be used to assess the effect of climate change on the diversity and distribution of these species. The data set is also important for informing resource users, conservationists and policy makers about the biodiversity hotspots of these economically important species.
Coffee wilt disease: The forgotten threat to coffee
(Wiley Subscription Services, Inc, 2024-04) Peck, Lily D; Boa, Eric
AbstractCoffee is attacked by several highly damaging pests and diseases, which include cof-fee wilt disease (CWD). Despite a devastating impact in recent years, CWD receives little attention and its importance is downplayed or simply ignored. Memories are short and knowledge of past outbreaks fragmentary. Nearly two decades after the last major outbreaks, CWD has quietly faded into the background. This review de-scribes a series of outbreaks of CWD across Africa, from Uganda to Guinea, from the first discovery in the 1920s to a hugely damaging recurrence that began in the 1970s and lasted through to the 2000s. This second wave had devastating impacts on grow-ers and communities in the Democratic Republic of Congo and in Uganda. This review examines the origins of the disease, how and why it spread, and attempts to manage the outbreaks. Recent work on new pathogen variants is also considered. This review aims to recount these events and to evaluate the strategic successes and failures at national, regional and international levels in tackling the second wave of CWD
Prevalence and determinants of minimum dietary diversity for women of reproductive age in Uganda
(BioMed Central Ltd, 2024-03) Kimuli, Derrick; Nakaggwa, Florence; Namuwenge, Norah; Nsubuga, Rebecca N; Kasule, Kenneth; Nyakwezi, Sheila; Odong, Jimmy; Isabirye, Paul; Sevume, Solome; Mubiru, Norbert; Mwehire, Daniel; Matovu, Fatuma; Wandera, Bonnie; Amuron, Barbara; Bukenya, Daraus
BACKGROUNDGlobally, over a billion women of reproductive age (WRA) suffer from some kind of undernutrition micronutrient deficiencies, and/or anemia as a result of inadequate dietary diversity. This leads to poor maternal and child health outcomes, however, there is limited research on population level research on minimum dietary diversity for women (MDD-W). This study assessed the prevalence and predictors of MDD-W among WRA in Uganda.METHODSThis study was a secondary analysis of data from the lot quality assurance sampling (LQAS) survey conducted across 55 Ugandan districts between May and September 2022. Women of various ages were interviewed across 5 study subgroups that this study used to construct its study population (WRA). Descriptive analyses, tests for outcome differences, and multilevel mixed-effects logistic regression were conducted at a 5% statistical significance level using STATA version 17. The results were reported using Adjusted Odds Ratios (aOR) as the measure of the outcome.RESULTSThe study analyzed responses from 29,802 WRA with a mean age of 27.8 (± 6.8) years. Only 8.8% (95% CI 8.5-9.3) achieved the MDD-W, the least proportion was observed in the South-Central region (3.13%). In the adjusted analysis, WRA who were older than 25 years (aOR 1.1, 95% CI 1.1-1.3, p < 0.001), had secondary education (aOR = 1.4, 95% CI 1.1-1.7, p = 0.003) or above (aOR = 1.7, 95% CI 1.3-2.2, p < 0.001), and used modern contraceptives (aOR = 1.1, 95% CI 1.0-1.3, p = 0.01) were more likely to achieve the MDD-W. Conversely, WRA who travelled longer distances to the nearest household water source (aOR = 0.8, 95% CI 0.7-0.9, p = 0.002) and those residing in larger households (aOR = 0.9, 95% CI 0.8-1.0, p = 0.019) were less likely to achieve the MDD-W.CONCLUSIONA low proportion of WRA met the MDD-W. Age, education level, household sizes and use of modern contraception were predictors of MDD-W among WRA in Uganda. MDD-W-related program efforts in Uganda should strengthen multisectoral collaboration with prioritization of younger women, education, household sizes and access to safe water sources.
Seroprevalence of contagious bovine pleuropneumonia (CBPP) in cattle from Karamoja region, North-eastern Uganda
(BioMed Central Ltd, 2024-03) Tweyongyere, Robert; Nkamwesiga, Joseph; Etiang, Patrick; Mugezi, Israel; Wamala, Henry; Wasswa, Auther Tamale; Kamusiime, Maureen; Ainebyoona, Solomon; Abizera, Harriet; Mwiine, Frank Norbert; Muhanguzi, Dennis
Background Contagious bovine pleuropneumonia [CBPP] is a transboundary animal disease of cattle caused by Mycoplasma mycoides subsp. mycoides [Mmm]. CBPP causes severe economic losses to livestock producers in sub-Saharan Africa mainly due to high mortality, morbidity, reduction in productivity as well as livestock trade restrictions. This study aimed at determining seroprevalence of Mmm in cattle from Karamoja region, north-eastern Uganda; data that are required to design and implement risk based CBPP control program. Methods We randomly collected blood samples from 2,300 cattle spread across Karamoja region. Serum was extracted and screened for antibodies against Mycoplasma mycoides subsp. mycoides [Mmm] using the competitive enzyme linked immunosorbent assay [cELISA]. Results A quarter [25.4%; 95% CI: 23.7-27.3] of the screened cattle [n = 2,300] were sero-positive for Mmm. Amudat and Kaabong districts recorded the lowest [12.3%] and highest [30.7%] Mmm seroprevalence respectively. Increasing age, overnight stay in cattle kraals and location [certain districts, villages, herds and sub counties] of the cattle herds, the factors that promote animal commingling, were the most significant risk factors of seroconversion with Mmm. Conclusion Results from this study indicated a higher seroprevalence of Mmm in Karamoja region cattle herds. This could be due to the increased frequency of CBPP outbreaks in recent years. To be effective, CBPP vaccination programs should target high risk herds along the international borders and other hotspot areas [e.g., parishes or sub counties] where cattle commingling is high. Keywords: Karamoja region, Uganda, Seroprevalence, CBPP, cELISA, Cattle
Peanut (Arachis hypogea) accessions differentially accumulate aflatoxins upon challenge by Aspergillus flavus: Implications for aflatoxin mitigation
(Elsevier B.V, 2024-03) Salano, Elsie Nyangweso; Mulwa, Richard Mwanza; Obonyo, Meshack Amos
Peanut is among the most important oil crops grown in sub-Saharan Africa for its nutritive value and economic benefit. In this region, Aspergillus flavus infects peanuts and contaminates produce with aflatoxins leading to food insecurity through lowered quality. The impact of aflatoxins transcends the food chain causing harm to human and animal health. The selection and production of aflatoxin-tolerant varieties of peanut is a promising strategy to mitigate their potential harm. We studied the resistance of peanut kernels to aflatoxin accumulation in 25 peanut accessions collected from different growing locations in Kenya, Uganda, and Rwanda based on their unique phenotypic characteristics. To obtain sufficient planting material, the peanut accessions were multiplied separately under standard conditions and harvested at their respective maturity dates then dried and stored at 4 °C before further analysis. At the start of the experiment, the kernels were challenged with a laboratory-characterized toxigenic strain (Aspergillus flavus 1EM1901) and incubated at 28 °C for 7 days. Afterward, the accessions were analysed (ELISA) for aflatoxins. Of the 25 accessions tested, 60 % (n = 15) exhibited kernel resistance to aflatoxin accumulation while 40 % (n = 10) were susceptible (with aflatoxin levels ranging from 0.54 ppb to 1692.92 ppb). Two of the resistant accessions recorded a decrease in aflatoxin accumulation when challenged with toxigenic A. flavus. This differential accumulation of aflatoxins suggests the existence of an inherent trait that can be exploited in breeding programs of peanut varieties with low aflatoxin accumulation when grown in contaminated soils. These findings are further discussed.
Comovement between agricultural commodities and stock returns of commodity-dependant sub-saharan Africa countries amidst the COVID-19 pandemic
(Elsevier B.V, 2024-03) Woode, John Kingsley; Idun, Anthony Adu-Asare; Kawor, Seyram
The study analyses the comovement between agricultural commodities (cocoa, coffee, corn, cotton, and soybeans) and sub-Saharan African equities (BRVM, Ghana, Kenya, Mauritius, and Uganda) heavily exposed to shocks from the COVID-19 pandemic spanning from January 2017 to December 2022. Through bivariate and multivariate wavelet analysis, the study identifies the adaptive and asymmetrical nature of the sampled markets both in the pre-pandemic and pandemic periods. The results highlight commodities as the main driving force behind equities, with few exceptions, and reveal these markets' safe-haven and hedge potential during the pandemic and the normal periods, except for the multivariate case. The bivariate findings suggest that global investors can consider investing in agricultural commodities and the sampled equities for enhanced portfolio diversification. By examining the interconnectedness of the sampled market across different timeframes and investment horizons, the study has uncovered significant implications for policy-making, portfolio diversification strategies, and risk management approaches.
Exploring the interplay between climate change and schistosomiasis transmission dynamics
(Elsevier B.V, 2024-03) Tabo, Zadoki; Kalinda, Chester; Breuer, Lutz; Albrecht, Christian
Schistosomiasis, a neglected tropical disease caused by parasitic worms, poses a major public health challenge in economically disadvantaged regions, especially in Sub-Saharan Africa. Climate factors, such as temperature and rainfall patterns, play a crucial role in the transmission dynamics of the disease. This study presents a deterministic model that aims to evaluate the temporal and seasonal transmission dynamics of schistosomiasis by examining the influence of temperature and rainfall over time. Equilibrium states are examined to ascertain their existence and stability employing the center manifold theory, while the basic reproduction number is calculated using the next-generation technique. To validate the model's applicability, demographic and climatological data from Uganda, Kenya, and Tanzania, which are endemic East African countries situated in the tropical region, are utilized as a case study region. The findings of this study provide evidence that the transmission of schistosomiasis in human populations is significantly influenced by seasonal and monthly variations, with incidence rates varying across countries depending on the frequency of temperature and rainfall. Consequently, the region is marked by both schistosomiasis emergencies and re-emergences. Specifically, it is observed that monthly mean temperatures within the range of 22-27 °C create favorable conditions for the development of schistosomiasis and have a positive impact on the reproduction numbers. On the other hand, monthly maximum temperatures ranging from 27 to 33 °C have an adverse effect on transmission. Furthermore, through sensitivity analysis, it is projected that by the year 2050, factors such as the recruitment rate of snails, the presence of parasite egg-containing stools, and the rate of miracidia shedding per parasite egg will contribute significantly to the occurrence and control of schistosomiasis infections. This study highlights the significant influence of seasonal and monthly variations, driven by temperature and rainfall patterns, on the transmission dynamics of schistosomiasis. These findings underscore the importance of considering climate factors in the control and prevention strategies of schistosomiasis. Additionally, the projected impact of various factors on schistosomiasis infections by 2050 emphasizes the need for proactive measures to mitigate the disease's impact on vulnerable populations. Overall, this research provides valuable insights to anticipate future challenges and devise adaptive measures to address schistosomiasis transmission patterns.
Efficacy of Event MON 87460 in drought-tolerant maize hybrids under optimal and managed drought-stress in eastern and southern africa
(Elsevier B.V, 2014-03) Obunyali, Caleb O; Pillay, Kiru; Meisel, Barbara; Ndou, Eric N; Mashingaidze, Kingstone; Sserumaga, Julius Pyton; Asea, Godfrey; Mwimali, Murenga; Tende, Regina; Beyene, Yoseph; Mugo, Stephen; Okogbenin, Emmanuel; Oikeh, Sylvester O.
Abstract Frequent drought events due to climate change have become a major threat to maize (Zea mays L.) production and food security in Africa. Genetic engineering is one of the ways of improving drought tolerance through gene introgression to reduce the impact of drought stress in maize production. This study aimed to evaluate the efficacy of Event MON 87460 (CspB; DroughtGard®) gene in more than 120 conventional drought-tolerant maize hybrids in Kenya, South Africa, and Uganda for 3–6 years under managed drought-stress and optimal conditions and establish any additional yield contribution or yield penalties of the gene in traited hybrids relative to their non-traited isohybrids. Germplasm used in the study were either MON 87460 traited un-adapted (2008–2010), adapted traited DroughtTEGO® (2011–2013) or a mix of both under confined field trials. Results showed significant yield differences (p < 0.001) among MON 87460 traited and non-traited hybrids across well-watered and managed drought-stress treatments. The gene had positive and significant effect on yield by 36–62% in three hybrids (CML312/CML445; WMA8101/CML445; and CML312/S0125Z) relative to non-traited hybrids under drought, and without significant yield penalty under optimum-moisture conditions in Lutzville, South Africa. Five traited hybrids (WMA2003/WMB4401; CML442/WMB4401; CML489/WMB4401; CML511/CML445; and CML395/WMB4401) had 7–13% significantly higher yield than the non-traited isohybrids out of 34 adapted DroughtTEGO® hybrids with same background genetics in the three countries for ≥ 3 years. The positive effect of MON 87460 was mostly observed under high drought-stress relative to low, moderate, or severe stress levels. This study showed that MON 87460 transgenic drought tolerant maize hybrids could effectively tolerate drought and shield farmers against severe yield loss due to drought stress. The study signified that development and adoption of transgenic drought tolerant maize hybrids can cushion against farm yield losses due to drought stress as part of an integrated approach in adaptation to climate change effects.
State of knowledge of aquatic ecosystem and fisheries of the Lake Edward System, East Africa
(Wiley, 2024-02) Laban Musinguzi; Nathan Vranken; Vianny Natugonza; William Okello; Maarten vanSteenberge; Jos Snoeks
Abstract Poor and unreliable knowledge of the status of freshwater fisheries limits their inclusion in governance processes, thereby impeding effective management measures. This threatens the livelihoods of people, particularly in developing countries. Improved knowledge is required to draw the attention of policymakers and stimulate effective management measures to accelerate the sustainability of the freshwater fisheries. In line with this requirement, this paper provides the state of knowledge of the aquatic ecosystem and fisheries of the Lake Edward system, East Africa, focusing on lakes Edward, George and the Kazinga channel. The state of knowledge was accomplished by reviewing existing data and information on aspects of primary productivity and water quality, invertebrates, fish fauna, fish life history and ecology, and fisheries. The waterbodies have been monitored since the 1930s, albeit sporadically, providing data on all the above aspects but with substantial temporal gaps. Adequate and updated data and information exist on the water quality status of the water bodies, extant aquatic taxa (including fishes) and fish catches but with uncertainties in the latter. Data and information gaps exist on the abundance of biotic communities, fish life history, quantitative trophic ecology and fisheries management reference points. The aggregated data and information can directly support decisions for fisheries management. We recommend regular monitoring to fill the data and information gaps, more comprehensive stock assessments and the development of aquatic ecosystem models.

Browse

Recent Submissions