Stephen Ogada

ORCID: 0000-0001-8292-7085
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About
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Research Areas
  • Livestock and Poultry Management
  • Animal Nutrition and Physiology
  • Genetic diversity and population structure
  • Genetic and phenotypic traits in livestock
  • Livestock Farming and Management
  • Animal Diversity and Health Studies
  • Virology and Viral Diseases
  • Animal Behavior and Reproduction
  • Plant nutrient uptake and metabolism
  • Animal Virus Infections Studies
  • Animal Disease Management and Epidemiology
  • Wastewater Treatment and Nitrogen Removal
  • Aquatic Ecosystems and Phytoplankton Dynamics
  • Genetic and Environmental Crop Studies
  • Oil Palm Production and Sustainability
  • Global Maternal and Child Health

Jomo Kenyatta University of Agriculture and Technology
2019-2024

Ministry of Agriculture Livestock and Fisheries
2022

This study aimed to investigate the signatures of selection in guineafowl and chicken genomes adapted divergent climatic conditions across Africa, Asia, Europe. We used whole genome sequence data guineafowls from selected countries these continents. To identify selection, we employed three population genomics methods: FST, integrated Haplotype Score (iHS), Cross-Population Extended Homozygosity (XP-EHH). Our findings revealed enriched terms related metabolic processes, response stimulus,...

10.1101/2025.01.22.634375 preprint EN cc-by-nd bioRxiv (Cold Spring Harbor Laboratory) 2025-01-24

Despite much attention given to the history of goat evolution in Kenya, information on origin, demographic history, dispersal route, and genetic diversity Galla goats remains unclear. Here, we examined background, diversity, population variation using mtDNA D-loop HSP70 single-nucleotide polymorphism markers. The results revealed 90 segregating sites 68 haplotypes a 600-bp sequence. overall mean mitochondrial haplotype was 0.993. diversities ranged between 0.8939 ± 0.0777 1.0000 0.0221 all...

10.1155/2024/5564596 article EN cc-by Genetics Research 2024-02-05

Indigenous chickens at the Swahili coast and other traditional migratory corridors in Kenya represent important populations that are inconclusively characterized. Using a comprehensive dataset of Kenyan indigenous additional mined data from 8 African 5 Asian countries, we performed univariate multivariate assessments to uncover underlying phenotypic morphometric variability. expressed differentiation several qualitative quantitative traits, both among different counties coast, coastal,...

10.3382/ps/pez097 article EN cc-by-nc-nd Poultry Science 2019-03-09

Newcastle disease (ND) causes significant economic losses in the poultry industry developing countries. In Kenya, despite rampant annual ND outbreaks, implementation of control strategies is hampered by a lack adequate knowledge on circulating and outbreak causing-NDV strains. This study reports first complete genome sequences NDV from backyard chicken Kenya. The results showed that all three isolates are virulent, as assessed mean death time (MDT) intracerebral pathogenicity index (ICPI)...

10.1155/2020/4705768 article EN cc-by International Journal of Microbiology 2020-08-18

Ammonium toxicity in macrophytes reduces growth and development due to a disrupted metabolism high carbon requirements for internal ammonium detoxification. To provide more molecular support detoxification the above-ground below-ground parts of Myriophyllum spicatum, we separated (using hermetic bags) aqueous medium surrounding from that explored genes these two regions. The results showed an upregulation asparagine synthetase under concentrations. Furthermore, transcriptional down and/or...

10.3390/plants12223875 article EN cc-by Plants 2023-11-16

Abstract Hunting wild African harlequin quails ( Coturnix delegorguei ) using traditional methods in Western Kenya has been ongoing for generations, yet their genetic diversity and evolutionary history are largely unknown. In this study, the variation demographic of were assessed a 347bp mitochondrial DNA (mtDNA) control region fragment 119,339 single nucleotide polymorphisms (SNPs) from genotyping‐by‐sequencing (GBS) data. Genetic analyses revealed that was predominantly among individuals...

10.1002/ece3.8458 article EN cc-by Ecology and Evolution 2021-12-01

The wild African harlequin quails (Coturnix delegorguei delegorguei) of Western Kenya suffer from incessant hunting, habitat fragmentation, and the effects climate change. These challenges, among others, have forced them to breed under intensive pressure, disrupting normal evolutionary processes. Here, we provide first overview selection signatures in using genotyping-by-sequencing information 76 captured individuals. Additionally, 19 domestic Japanese coturnix japonica) were incorporated...

10.22541/au.169441932.27036700/v1 preprint EN Authorea (Authorea) 2023-09-11

Doum palm (Hyphaene compressa) is a perennial economic plant primarily growing in Kenya's Arid and Semi-Arid Lands (ASALs). It heavily relied upon for food, animal feed, construction materials medicine, making it an ideal resource sustainability. However, the limited information on its genetic resources has hindered breeding conservation studies. This study used genotyping by sequencing approach to identify Single Nucleotide Polymorphisms. These SNPs were further assess diversity population...

10.3389/fgene.2022.762202 article EN cc-by Frontiers in Genetics 2022-02-04

Emerging livestock like guinea fowls and quails are important alternative sources of poultry meat eggs to chicken. These species also a significant source income, especially poor rural farmers. The study surveyed selected regions Kenya determine the factors influencing market performance fowl quail products. A total 652 farmers participated in through interviews filling questionnaires. Data was analyzed using quantitative qualitative procedures where descriptive statistics were conducted by...

10.4314/jagst.v21i1.4 article EN cc-by Journal of Agriculture Science and Technology 2022-04-26
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