Academic publications

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https://hdl.handle.net/20.500.11951/16

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Browsing Academic publications by Author "Balyejusa Kizito, Elizabeth"

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    Dentification of Growth Stage-Specific Watering Thresholds for Drought Screening in Solanum aethiopicum Shum
    (Natureresearch, 2020) Nakanwagi, Mildred Julian; Sseremba, Godfrey; Kabod Nahamya , Pamela; Masanza, Michael; Balyejusa Kizito, Elizabeth
    Effective phenotyping for drought resistance is a pre-requisite for identification of modest crop varieties for farmers. For neglected and underutilized crops such as Solanum aethiopicum Shum group, no drought screening protocol based on rigorous iterations has been documented. A split-plot nested treatment structure was arranged in an experiment to identify growth stage-specific watering thresholds for this crop. Three plant growth stages (main plot; seedling, vegetative and flowering), watering regime at plant growth stage (2 regimes; well-watered and drought stressed) and day since last watering at plant growth stage were evaluated for soil moisture content (SMC), leaf wilting score (LWS), number of green leaves per plant (LPP) and leaf blade width (LBW). Highly significant differences (p < 0.001) were found at the different plant growth stages, watering regime (WR) within plant growth stage, and day within WR and plant growth stage. Under drought stress treatment, SMC declined exponentially at each stage. The earliest leaf wilting, reduction in LPP and LBW were generally observed at flowering followed by vegetative and slowest at the seedling stage. For future effective drought phenotyping studies in S. aethiopicum Shum and related crops, we recommend setting minimum drought stress treatments below 18% SMC at which the LWS is ≥2 at the vegetative.
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    Evaluation of Partial Replacement of Fish Meal with Lablab Purpureus Seed Meal on the Performance of Broilers
    (Africa Journals Online, 2022) Isabirye Kuzegera, David; Higenyi, James; Balyejusa Kizito, Elizabeth; xGalukande, Esau Galukande
    This study investigated the use of Lablab purpureus seed meal as protein ingredient replacing fish meal. One hundred eighty (180) broiler chicks were used in a complete randomized block design. Three treatments were used; A (fish meal, as control), B (30% fish replacement by roasted lablab with enzyme supplement) and C (45% fish replacement by roasted lablab with enzyme supplement). The parameters studied were; feed consumption, weight gain and feed conversion ratio (FCR). Results revealed significant (P<0.05) differences in feed intake, weight gain and feed conversion ratio among the treatments. Throughout the study, chicks registered high feed intake on diet C and A while that in group B reported the least. Average weight gains were high for group C and A while group B registered the lowest. Feed conversion ration; lowest for group C and highest in group B. Therefore, a better performance of broilers is enhanced consumption by high intake of feed, high weight gains and low FCR, 45% dietary fish meal can be replaced by Lablab purpureus seed meal with enzyme supplement in a compounded broiler finisher.
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    Prevalence and Risk Factors of Gastrointestinal Parasite Infection in Goats in Sironko District, Eastern Uganda
    (Africa Journals Online, 2020) Namutosi, Winnie; Higenyi, James; Balyejusa Kizito, Elizabeth; Omodo, Micheal
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    Quantitative Trait Loci Controlling Cyanogenic Glucoside and Dry Matter Content in Cassava (Manihot esculenta Crantz) Roots
    (Wiley Online Lirary, 2007) Balyejusa Kizito, Elizabeth; Rönnberg-Wästljung, Ann-Christin; Egwang, Thomas; Gullberg, Urban; Fregene, Martin; Westerbergh, Anna
    Cassava (Manihot esculenta Crantz) is a starchy root crop grown in the tropics mainly by small-scale farmers even though agro-industrial processing is rapidly increasing. For this processing market improved varieties with high dry matter root content (DMC) is required. Potentially toxic cyanogenic glucosides are synthesized in the leaves and translocated to the roots. Selection for varieties with low cyanogenic glucoside potential (CNP) and high DMC is among the principal objectives in cassava breeding programs. However, these traits are highly influenced by the environmental conditions and the genetic control of these traits is not well understood. An S1 population derived from a cross between two bred cassava varieties (MCOL 1684 and Rayong 1) that differ in CNP and DMC was used to study the heritability and genetic basis of these traits. A broad-sense heritability of 0.43 and 0.42 was found for CNP and DMC, respectively. The moderate heritabilities for DMC and CNP indicate that the phenotypic variation of these traits is explained by a genetic component. We found two quantitative trait loci (QTL) on two different linkage groups controlling CNP and six QTL on four different linkage groups controlling DMC. One QTL for CNP and one QTL for DMC mapped near each other, suggesting pleiotrophy and/or linkage of QTL. The two QTL for CNP showed additive effects while the six QTL for DMC showed additive effect, dominance or overdominance. This study is a first step towards developing molecular marker tools for efficient breeding of CNP and DMC in cassava.