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The Impact Of A Summer Bridge Program At A Public Land-Grant University In The Southeastern Region On The Retention Of First-Time Black Students, Marcus Isaiah Brumfield May 2024

The Impact Of A Summer Bridge Program At A Public Land-Grant University In The Southeastern Region On The Retention Of First-Time Black Students, Marcus Isaiah Brumfield

Theses and Dissertations

Over the past few decades, there has been a push to retain and increase URM student participation in STEM fields. To address this need, there are STEM Summer Bridge programs that specifically target underrepresented minority (URM) students to assist with the transition from high school to college. Summer bridge programs were established as a response to the effort to help with the transition from high school to college for first-time students. There are a number of these programs that specifically target URM students with the goal of increasing the diversity within professions that are related to the STEM areas of …


Jackson, Mississippi Food Security Efforts: Understanding The Current And Future Foodscape, Natalie Rosemary Bowers May 2024

Jackson, Mississippi Food Security Efforts: Understanding The Current And Future Foodscape, Natalie Rosemary Bowers

Theses and Dissertations

In Jackson, Mississippi, basic needs like access to food and water are critical issues. This research reveals efforts and actors working to improve food access within Jackson’s foodscape. This study uses interview and mapping methodologies, which unearth the challenges and opportunities for food efforts in Jackson. Current food work is analyzed through a cultural lens – How is the work influenced by the unique conditions and aspects of Jackson? – and a temporal lens – How does time impact access? What are historic changes and future visions for Jackson? These investigations contribute to opportunities for developing sustainable food systems, determining …


The Evaluation Of Italian Ryegrass Control And Rice (Oryza Sativa) Response Using Fall-Applied Residual Herbicides, Taylor D. Burrell Ii May 2024

The Evaluation Of Italian Ryegrass Control And Rice (Oryza Sativa) Response Using Fall-Applied Residual Herbicides, Taylor D. Burrell Ii

Theses and Dissertations

Italian ryegrass (Lolium perenne) is one of the most troublesome weeds of rice in Mississippi. Its resistance to multiple modes of action has made it more difficult to control in recent years. The most effective and economical management strategy to control Italian ryegrass is fall-applied residual herbicides; however, the most effective products are not labeled for use in the fall prior to rice seeding. Therefore, research was conducted in Stoneville, MS, to evaluate the effect of fall-applied residual herbicides on rice growth and development. Acetochlor should not be applied in fall targeting Italian ryegrass in fields where rice is scheduled …


Failure Of Polymeric Materials At Ultra-High Strain Rates, Kyle Richard Callahan May 2024

Failure Of Polymeric Materials At Ultra-High Strain Rates, Kyle Richard Callahan

Theses and Dissertations

Understanding the failure behavior of polymers subjected to an ultrahigh strain rate (UHSR) impact is crucial for their applications in any protective shielding. But little is known about how polymers respond to UHSR events at the macroscale, or what effect their chemical makeups and morphology contribute. This dissertation aims to answer these questions by characterizing the responses of polymers subjected to UHSRs, investigating how the polymer molecular architecture and morphologies alter the macroscopic response during UHSRs via hypervelocity impact (HVI), linking the behaviors of UHSR events between the macro- and nano-length scales, and determining the consequences of UHSR impacts on …


Identifying Immunogenic Pneumococcal Proteins With Roles In Colonization Of Human Epithelium, Abigail Cassibry May 2024

Identifying Immunogenic Pneumococcal Proteins With Roles In Colonization Of Human Epithelium, Abigail Cassibry

Theses and Dissertations

Streptococcus pneumoniae (pneumococcus) is a Gram positive opportunistic bacterium that is a primary cause of pneumonia in young children and immunocompromised individuals. This microorganism colonizes the nasopharynx of all age groups and health levels and is easily transmitted through respiratory droplets or aerosols. While capsule-based vaccines are available, these are becoming more obsolete as S. pneumoniae strains are undergoing serotype replacement, thus evading detection, and antibiotic resistant strains are increasing in prevalence. This study has taken a different approach by identifying immunogenic proteins that elicit antibodies which block attachment of bacteria to host epithelial cells. Proteins with the most potential …


Stimulus Complexity And Feature Binding In Visual Sensory Memory, Mary F. Catington May 2024

Stimulus Complexity And Feature Binding In Visual Sensory Memory, Mary F. Catington

Theses and Dissertations

In all past research, iconic memory shows a significant benefit over visual working memory for storage capacity of visual items. However, this effect has only been studied on simple items such as colors and letters. The goal of this thesis was to determine whether an iconic benefit also exists for visual stimuli with higher visual complexity, such as shapes and faces. Five experiments tested iconic and working memory capacity for complex face stimuli, intermediate-complexity shape stimuli, and simple color stimuli, as well as examining feature binding of objects in iconic memory. Results from these five experiments indicated that increased visual …


Resource Sharing In Secure Distributed Systems, Trisha Chakraborty May 2024

Resource Sharing In Secure Distributed Systems, Trisha Chakraborty

Theses and Dissertations

Allocating resources in computer systems is a significant challenge due to constraints on resources, coordinating access to those resources, and tolerating malicious behavior. This dissertation investigates two fundamental problems concerning resource allocation. The first addresses the general challenge of sharing server resources among multiple clients, where an adversary may deny the availability of these resources; this is known as a denial-of-service (DoS) attack. Here, we propose a deterministic algorithm that employs resource burning (RB)—the verifiable expenditure of a network resource—to defend against DoS attacks. Specifically, our solution forces an adversary to incur higher RB costs compared to legitimate clients. Next, …


Economics And Risk Of Catfish Production Strategies, Morgan Christine Cheatham May 2024

Economics And Risk Of Catfish Production Strategies, Morgan Christine Cheatham

Theses and Dissertations

US catfish producers, seeking to reduce production costs, adopted technologies and production systems with the potential to increase the catfish pond productivity. Catfish pond intensification was accompanied by increased operating risk due to increased reliance on operating inputs. Split ponds were one adopted production system. The US catfish industry has adopted four split-pond variants differentiated by water circulation mechanism. Variants include the slow-rotating paddlewheel, the modified paddlewheel aerator, the screw pump, and the axial-flow turbine pump. Initial investment ranged from $54,400/4-ha ponds to $71,150/4-ha pond. Mean annual gross fish yield ranged from 12,876 kg/ha to 16,984 kg/ha. Net returns were …


The Effects Of Vitamin D Supplementation On Prostate Cancer, Grier Cosby May 2024

The Effects Of Vitamin D Supplementation On Prostate Cancer, Grier Cosby

Theses and Dissertations

This systematic review's goal is to evaluate the efficacy of vitamin D supplementation in helping to manage the nutritional needs of patients diagnosed with prostate cancer. A systematic literature search following the PRISMA guidelines using Scopus, PubMed, and Cochrane databases was conducted to review randomized controlled trials and interventional studies up to 2023. The search strategy targeted randomized controlled trials and intervention studies. The selection process involved screening for study characteristics (study design), participant demographics (prostate cancer patients receiving treatment), intervention details (vitamin D assessment methods, dosages), outcome measures (progression, prognosis, quality of life), and risk estimates (hazard ratios, odds …


Software Defined Radio (Sdr) Based Sensing, Ajaya Dahal May 2024

Software Defined Radio (Sdr) Based Sensing, Ajaya Dahal

Theses and Dissertations

The history of Software-Defined Radios (SDRs) epitomizes innovation in wireless communication. Initially serving military needs, SDRs swiftly transitioned to civilian applications, revolutionizing communication. This thesis explores SDR applications such as Spectrum Scanning Systems, Contraband Cellphone Detection, and Human Activity Recognition via Wi-Fi signals. SDRs empower Spectrum Scanning Systems to monitor and analyze radio frequencies, optimizing spectrum allocation for seamless wireless communication. In Contraband Cellphone Detection, SDRs identify unauthorized signals in restricted areas, bolstering security efforts by thwarting illicit cellphone usage. Human Activity Recognition utilizes Raspberry Pi 3B+ to track movement patterns via Wi-Fi signals, offering insights across various sectors. Additionally, …


Effect Of Metaphylaxis In High-Risk Stocker Heifers On The Nasopharyngeal Microbiome, Resistome, And Antimicrobial Resistance Of Mannheimia Haemolytica, William Byrn Crosby May 2024

Effect Of Metaphylaxis In High-Risk Stocker Heifers On The Nasopharyngeal Microbiome, Resistome, And Antimicrobial Resistance Of Mannheimia Haemolytica, William Byrn Crosby

Theses and Dissertations

Bovine respiratory disease (BRD) is the leading cause of morbidity in feeder and stocker cattle, resulting in large impacts on economics of stocker and feedlot operations. One of the most effective means of controlling BRD is the mass administration of antimicrobials (AM) at arrival or “metaphylaxis”, potentially leading to increased antimicrobial resistance (AMR). Mannheimia haemolytica (MH), the most commonly isolated bacterial pathogen in BRD cases in feedlot cattle, has been shown to have integrative-conjugative elements (ICE), which are mobile genetic elements that have the ability to integrate themselves in the host genome. Notably, these ICE have been shown to contain …


Collective Bodies And Individual Experiences: The Case Of Chamber Tomb Four At Nikoleika Aigio, Achaea, Greece​, Daniel David Dillon May 2024

Collective Bodies And Individual Experiences: The Case Of Chamber Tomb Four At Nikoleika Aigio, Achaea, Greece​, Daniel David Dillon

Theses and Dissertations

The end of the Bronze Age was a tumultuous period throughout the Mediterranean, seeing the fall of the major palatial economy in Greece. This project seeks to reconstruct the lived experiences of individuals interred at the Nikoleika cemetery in eastern Achaea, utilizing a variety of methods to analyze biological profiles and pathological conditions. Through the analysis of the 55 burials of Chamber Tomb Four, it was found that low levels of pathology and the presence of locally-produced goods may emphasize the self-sufficient nature of Achaea during the Bronze Age. The osteobiographies of three primary burials also revealed a great deal …


The Impact Of Academic Advising On Persistence In Nontraditional Students Completing A Baccalaureate Degree Online, Kali M. Dunlap May 2024

The Impact Of Academic Advising On Persistence In Nontraditional Students Completing A Baccalaureate Degree Online, Kali M. Dunlap

Theses and Dissertations

The increasing enrollment of nontraditional students in online degree programs has underscored the importance of effective academic advising practices. These students, often over the age of 25 and juggling full-time employment and family responsibilities, encounter unique challenges in navigating the asynchronous, online learning environment. Academic advisors play a pivotal role in mitigating these obstacles by fostering trust and delivering comprehensive support systems tailored to the needs of online learners. While previous studies have explored various advising models and approaches in connection with student satisfaction, inadequate attention has been given to assessing the quality of advising specifically tailored to nontraditional, online …


Quantum Task Mapping For Large-Scale Heterogenous Computing Systems, Mackenzie Danyel Ellenberger May 2024

Quantum Task Mapping For Large-Scale Heterogenous Computing Systems, Mackenzie Danyel Ellenberger

Theses and Dissertations

Heterogeneous computing (HC) systems are essential parts of modern-day computing architectures such as cloud, cluster, grid, and edge computing. Many algorithms exist within the classical environment for mapping computational tasks to the HC system’s nodes, but this problem is not well explored in the quantum area. In this work, the practicality, accuracy, and computation time of quantum mapping algorithms are compared against eleven classical mapping algorithms. The classical algorithms used for comparison include A-star (A*), Genetic Algorithm (GA), Simulated Annealing (SA), Genetic Simulated Annealing (GSA), Opportunistic Load Balancing (OLB), Minimum Completion Time (MCT), Minimum Execution Time (MET), Tabu, Min-min, Max-min, …


Charting The Course Through Complexity: Networked Approaches To Foster Sustainable And Resilient Supply Chains., Safae El Amrani May 2024

Charting The Course Through Complexity: Networked Approaches To Foster Sustainable And Resilient Supply Chains., Safae El Amrani

Theses and Dissertations

Amidst a dynamic global landscape, supply chains have transformed into complex, interdependent networks. These ever-growing complexities can catalyze a snowball effect, where minor disruptions ripple through sub-infrastructures, culminating in significant cascading failures. As a result, the imperative to bolster supply chain sustainability and resilience has never been greater. This dissertation explores the intricate dynamics of supply chain sustainability and resilience, introducing innovative methodologies for assessing and enhancing these critical aspects. This dissertation rigorously examines the themes of sustainability and resilience within supply chain networks through distinct yet complementary lenses. Initially, it delves into sustainability by introducing the Supply Chain Performance …


Synthesis And Degradation Of Biobased Polymers From Plant Oils Incorporated With Cellulose Nanocrystals., Katherine Elmore May 2024

Synthesis And Degradation Of Biobased Polymers From Plant Oils Incorporated With Cellulose Nanocrystals., Katherine Elmore

Theses and Dissertations

Synthetic plastics are intrinsic to modern human existence. Unfortunately, many challenges exist related to the accumulation of plastic waste, including greenhouse gas emissions, contamination of natural environments, and entrance into the food chain through microplastics. Therefore, new polymers are being developed that both compete with the capabilities and costs of petroleum-based plastics and have assured biodegradability. Through decades of research, plant oils have emerged as one of the leading options for alternative starting materials because of their feasibility for use in polymerization reactions, wide availability, renewability, and cost-effectiveness. In this work, cottonseed oil (CSO) and soybean oil (SBO) are successfully …


Wide-Spaced Furrow Irrigation Effects On Vertisols Under Corn Production In The Mississippi Delta, Thomas Barton Freeland Iii May 2024

Wide-Spaced Furrow Irrigation Effects On Vertisols Under Corn Production In The Mississippi Delta, Thomas Barton Freeland Iii

Theses and Dissertations

The majority of soils in the Mississippi Delta are vertisols, which are prone to waterlogging and can negatively affect crop production. Thus, our goal was to investigate whether widening the spacing of irrigated furrows will relieve waterlogging and improve corn productivity. The effects of furrow irrigation spacing on corn grain yield and quality were investigated for three years at a research station and a commercial farm. Widening furrow irrigation spacing up to 8 m never decreased corn grain yield, and higher corn yields were documented in 8 m furrow spacing compared to narrower irrigation spacing. Irrigation water was found to …


Evaluation And Enhancement Of The Phosphorus Index For The Mississippi Delta, Felipe Fernandez Martinez May 2024

Evaluation And Enhancement Of The Phosphorus Index For The Mississippi Delta, Felipe Fernandez Martinez

Theses and Dissertations

The Lower Mississippi Alluvial Basin (LMAB) faces significant environmental challenges due to phosphorus (P) runoff from agricultural lands, contributing to eutrophication and aquatic ecosystem degradation. Excess nutrient runoff, particularly P, threatens water quality and contributes to hypoxia in the Gulf of Mexico. The current Mississippi Phosphorus Index (P-Index), a tool for assessing P loss vulnerability from agricultural fields, has shown limitations in its applicability across the diverse conditions of the Mississippi Delta, a sub-region of the LMAB. This research presents a comprehensive revision of the P-Index by employing a suite of analytical techniques and diverse data sources, including geospatial analysis, …


Evaluating The Impact Of Biostimulants At Variable Nitrogen Rates In Mississippi Corn Production Systems, Praveen Gajula May 2024

Evaluating The Impact Of Biostimulants At Variable Nitrogen Rates In Mississippi Corn Production Systems, Praveen Gajula

Theses and Dissertations

A field study was conducted in 2022 and 2023 at two different locations in Mississippi (MS) implementing a split-plot design. Nitrogen (N) rates as the main plot including 0 (control), 90, 180, 269 kg N ha-1 at Starkville and 224 kg N ha-1 at Stoneville. The subplot was seven treatments, including a no biostimulant (check) and six commercially available microbial biostimulants (Source Corn®, Envita®, iNvigorate®, Blue N®, Micro AZTM, and Bio level phosN®) applied either as foliar at V4-V5 growth stages or in-furrow at planting. Only N rates positively affected grain yield and nitrogen use efficiency at all site years. …


Estimating Surface Reflectivity With Smartphone And Semi-Custom Gnss Receivers On Uas-Based Gnss-R Technology And Surface Brightness Temperature Using Uas-Based L-Band Microwave Radiometer, Md Mehedi Farhad May 2024

Estimating Surface Reflectivity With Smartphone And Semi-Custom Gnss Receivers On Uas-Based Gnss-R Technology And Surface Brightness Temperature Using Uas-Based L-Band Microwave Radiometer, Md Mehedi Farhad

Theses and Dissertations

Accurate measurement of soil moisture (SM) has a significant impact on agricultural production, hydrological modeling, forestry, horticulture, waste management, and other environmental fields. Particularly in precision agriculture (PA), high spatiotemporal resolution information about surface SM is crucial. However, the use of invasive SM probes and other sensors is expensive and requires extensive manpower. Moreover, these intrusive techniques provide point measurements and are unsuitable for large agricultural fields. As an alternative, this dissertation explores the remote sensing of surface SM by utilizing the surface reflectivity estimated from global navigation satellite systems reflectometry (GNSS-R) data acquired through smartphones and off-the-shelf, cost-effective U-blox …


Evaluation Of Air Fryer Technology Inactivation Of Salmonella Spp. In Brownies Formulated With Almond Flour And All-Purpose Flour, Courtlone Kenshon Glaspie May 2024

Evaluation Of Air Fryer Technology Inactivation Of Salmonella Spp. In Brownies Formulated With Almond Flour And All-Purpose Flour, Courtlone Kenshon Glaspie

Theses and Dissertations

Flour has been identified as the source of Salmonella related recalls and outbreaks in past years. Flour is not usually heat treated and can cause issues when eaten raw, such as in the consumption of cookie dough and batters. Alternative flours like almond flour have been used in some bakery products. Alternative cooking techniques like air frying have increased as well due to their ease of use. The objective of this research was to study the effectiveness of air fryer technology on the inactivation of Salmonella in brownies formulated with all-purpose and almond flour. The aw and pH decreased significantly …


Assessment Of The Results Decay Has On The Perpendicular Grain Properties Of Wood, Joseph Landon Greene May 2024

Assessment Of The Results Decay Has On The Perpendicular Grain Properties Of Wood, Joseph Landon Greene

Theses and Dissertations

Wood is used in a variety of structures dealing with construction of exterior and interior applications. It is critically important to periodically assess the condition of in-service wooden members. Catastrophic events, like hurricanes, make it imperative to evaluate wood used in building officials due to a higher moisture content. The objective for this study is to evaluate how effective nondestructive tests are at determining incipient decay in southern yellow pine due to brown-rot fungal attacks. Properties perpendicular to the grain will be assessed to determine the effect decay has on these properties. The variables being measured in this study are …


Evaluating The Bull Breeding Soundness Evaluation’S Utility As A Tool For Preventing Reproductive Inefficiency, Todd Galen Gunderson May 2024

Evaluating The Bull Breeding Soundness Evaluation’S Utility As A Tool For Preventing Reproductive Inefficiency, Todd Galen Gunderson

Theses and Dissertations

One of the most impactful challenges beef cow-calf producers face is the need to optimize reproductive efficiency. The ability of a veterinarian to identify potential sources of reproductive inefficiency is a valuable service they can offer. The breeding soundness evaluation (BSE) is one tool veterinarians use to identify subfertile bulls prior to use. This body of research shows that producers who have a defined breeding season have higher odds of hiring a veterinarian to perform BSEs, and that as breeding season length decreases, the probability of a management strategy that uses BSEs being profitable increases. Furthermore, not all veterinarians use …


Effects Of Subconjunctival Ropivacaine, Tetracaine, Mepivacaine, And Liposomal Bupivacaine On Corneal Sensitivity In Healthy Horses, Gabriel Alexander Gonzalez May 2024

Effects Of Subconjunctival Ropivacaine, Tetracaine, Mepivacaine, And Liposomal Bupivacaine On Corneal Sensitivity In Healthy Horses, Gabriel Alexander Gonzalez

Theses and Dissertations

Corneal sensitivity and adverse events following subconjunctival administration of three local anesthetics in twelve mares were evaluated. The subconjunctival space of the treated eye was injected with 0.2 mL of mepivacaine (2%), ropivacaine (1.3%) and liposomal bupivacaine (1.3%). All horses received each medication once and the contralateral eye received saline. The corneal touch threshold (CTT) was measured using a esthesiometer before sedation, after sedation, and at specified intervals until it returned to baseline. The mean total time of anesthesia (TTA) was 168.3 minutes for ropivacaine, 169.2 minutes for liposomal bupivacaine, 103.3 minutes for mepivacaine and 30.7 minutes for control. The …


Feasibility And Effectiveness Of Physical Activity Program In People With Down Syndrome Using Self Determination Theory, Maria Haider May 2024

Feasibility And Effectiveness Of Physical Activity Program In People With Down Syndrome Using Self Determination Theory, Maria Haider

Theses and Dissertations

Autonomous physical activity (PA) is challenging for adults with Down syndrome (DS) therefore PA programs tailored around facilitators of PA in individuals with Down syndrome (DS) that also align with Self-determination theory (SDT) components could be a feasible and effective way of increasing PA. The purpose was to assess the feasibility and effectiveness of a physical activity program based on self-determination theory in adults with Down syndrome. A dance program was conducted twice a week for 8 weeks. Each session was 60 minutes long. Adults with DS (n = 8) were tested before and after intervention for basic psychological needs …


Assessing Northern Bobwhite Habitat Use And Short-Term Response To Prescribed Fire In An Intensively Managed Longleaf Pine Ecosystem, Jeffrey Martin Grayum May 2024

Assessing Northern Bobwhite Habitat Use And Short-Term Response To Prescribed Fire In An Intensively Managed Longleaf Pine Ecosystem, Jeffrey Martin Grayum

Theses and Dissertations

Effective conservation requires reliable knowledge of habitat selection and data describing the target species’ response to prominent management techniques. Herein, I describe northern bobwhite breeding season resource selection in an intensively managed longleaf pine ecosystem and investigate the influence of post-fire succession and days-since-fire on bobwhite use of recently burned areas. I recorded bobwhite locations three times per week and surveyed recently burned areas twice daily. I found that bobwhite prefer natural pine woodlands burned the current year and pine plantations, hardwood pine forest, and shrub/scrub communities burned 1-2 years ago. Bobwhite avoided natural pine woodlands burned 1-2 years ago, …


Towards Clearer Paths: Addressing Camera Obstructions In Autonomous Vehicles Through Neural Networks, Nicholas J. Harvel May 2024

Towards Clearer Paths: Addressing Camera Obstructions In Autonomous Vehicles Through Neural Networks, Nicholas J. Harvel

Theses and Dissertations

This study addresses the challenge of lens obfuscations in off-road autonomous vehicles, which compromise the essential visual inputs for safe navigation. Using a tiered approach, the research employs neural network architectures for preliminary image classification, semantic segmentation, and image-to-image translation to rectify obscured visual inputs. Initial classification using MobileNetV2 sets the stage for U-Net-driven semantic segmentation to identify obfuscated regions, followed by a modified Pix-to-Pix model for image restoration. The evaluation showcases promising results in improving visual clarity, marking a significant stride towards enhancing autonomous vehicle operational robustness in off-road environments. This work lays a foundation for future explorations into …


Resource Description Framework Parsing Method On The Uas Integration Safety And Security Technology Ontology, Hunter Harris May 2024

Resource Description Framework Parsing Method On The Uas Integration Safety And Security Technology Ontology, Hunter Harris

Theses and Dissertations

Ontological engineering utilizes ontologies for various purposes across the spectrum. Just as onotlogies are being used in healthcare, researchers are also developing ontologies for unmanned aerial systems (UAS). A specific ontology domain has been created laying out various aspects of counter unmanned aerial systems (cUAS), known as the “UAS Integration Safety and Security Technology Ontology” (ISSTO). Counter unmanned aerial systems are a collection of technologies and systems that detect, track, identify, and mitigate unmanned aerial systems. ISSTO represents a compilation of classes that encompass UAS and cUAS components. The classes within ISSTO include aircraft types, weather, sensors, UAS air traffic …


Derivations On Smooth Hensel-Steinitz Algebras, Shelley David Hebert May 2024

Derivations On Smooth Hensel-Steinitz Algebras, Shelley David Hebert

Theses and Dissertations

I define and analyze the Hensel-Steinitz algebra ����(��), a crossed product C∗-algebra associated with multiplication maps on continuous functions on the ring of ��-adic integers. In ����(��), I define an ideal and identify it with a known algebra. From this, I construct a short exact sequence conveying the structure of the algebras. I further identify smooth subalgebras within both ����(��) and its ideal, classify derivations on those algebras, and compare the classification with derivations on other smooth algebras. I also analyze the algebras associated with multiplication maps based on the multiplier being a root of unity, not a root of …


Evaluating The Effects Of Poultry Litter Amendments On Escherichia Coli Populations, Virulence Genes, And Antimicrobial-Resistance Genes In Poultry Litter During A Live Grow-Out., Faith Henson May 2024

Evaluating The Effects Of Poultry Litter Amendments On Escherichia Coli Populations, Virulence Genes, And Antimicrobial-Resistance Genes In Poultry Litter During A Live Grow-Out., Faith Henson

Theses and Dissertations

Poultry litter can harbor pathogenic bacteria, including avian pathogenic Escherichia coli (APEC). Applying litter amendments is one strategy to improve bird health and potentially reduce pathogens. Biochar and PLT were applied as litter amendments in a live bird trial to study their effects on E. coli populations, APEC virulence genes (VAG), and antimicrobial resistance (AMR) genes. Samples were collected at days 0, 17, 29, and 41 to enumerate E. coli and store bacterial isolates for antimicrobial-resistance gene analysis. Data analysis showed litter amendments did not significantly affect overall E. coli populations. Grow-out time impacted E. coli populations, with reductions occurring …