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On The Contribution Of Mmp-2 And Mmp-9 To The Postnatal Cerebellar Corticogenesis, Albert E. Ayoub Dec 2003

On The Contribution Of Mmp-2 And Mmp-9 To The Postnatal Cerebellar Corticogenesis, Albert E. Ayoub

Graduate Theses, Dissertations, and Problem Reports (ETD)

The development of the cerebellar cortex is dependent on orchestrated cell-cell, cell-matrix interactions, as well as intrinsic genetic programs. Matrix metalloproteinases (MMPs) are proteolytic enzymes that degrade ECM molecules and are involved in neuronal migration, process extension, and synaptic plasticity. The current study investigated (1) the developmental expression and activity of MMP-2 and MMP-9, and (2) the effect of blocking the activity of MMP-2 and MMP-9 by a specific inhibitor on the histogenesis of the cerebellar cortex. Cerebella were collected from rat pups every three days starting at postnatal day 3 (P3) until P25---a period equivalent to the third gestational …

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Potential Field Theory And Its Applications To Classical Mechanical Problems, Shannon Rae Stillwagon Dec 2003

Potential Field Theory And Its Applications To Classical Mechanical Problems, Shannon Rae Stillwagon

Graduate Theses, Dissertations, and Problem Reports (ETD)

Advances in many scientific fields are expected to come from work in nanotechnology. Engineering at nano-scales presents novel problems that classical mechanics cannot solve. Many engineers are uncomfortable designing at this level because classical or continuum mechanics does not apply and quantum mechanics is said to apply in a tangible way. There are unique opportunities to contribute to the design, controls, and analysis of systems that are particularly suited to mechanical engineering. Within the derivations of classical mechanics are assumptions that limit its use to bulk engineering. These assumptions are examined to determine what principles can be extended to smaller …

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Distributed Dispatchers For Partially Clairvoyant Schedulers, Kiran S. Yellajyosula Dec 2003

Distributed Dispatchers For Partially Clairvoyant Schedulers, Kiran S. Yellajyosula

Graduate Theses, Dissertations, and Problem Reports (ETD)

This work focuses on the empirical evaluation of distributed dispatching strategies on shared and distributed memory architectures for hard real-time systems. The dispatching model accommodates process parameter variability and analyzes the effect of variable execution times.;Hard real-time systems are modeled in the E-T-C scheduling framework and dispatched if a valid schedule exists. We examine the dispatchability of Partially Clairvoyant schedules of different sizes and varying deadlines under reasonable assumptions. The effect of scaling up the number of processors used by the dispatcher is also studied. The results validate the superiority of the distributed strategies over sequential dispatching and scalability of …

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Evaluating Runoff Water Quality And Ammonia Volatilization In Three Turkey Litter Application Methods, Michael Dale Shamblin Dec 2003

Evaluating Runoff Water Quality And Ammonia Volatilization In Three Turkey Litter Application Methods, Michael Dale Shamblin

Graduate Theses, Dissertations, and Problem Reports (ETD)

Poultry litter is an important nutrient source in crop production. However, the traditional practice of broadcasting poultry litter on the soil surface could result in nutrient losses in runoff as well as substantial ammonia volatilization losses, which could adversely affect both the environment and agricultural productivity. This research compared nutrient runoff (natural and simulated) losses on 1 m x 2 m plots and ammonia volatilization from different turkey litter application methods (broadcast, surface-banded, incorporated band, and control) applied in triplicate. No significant differences were observed between any of the treatments in any of the runoff constituents measured. Over three runoff …

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Soil Characterization, Classification, And Biomass Accumulation In The Otter Creek Wilderness, Jamie Schnably Dec 2003

Soil Characterization, Classification, And Biomass Accumulation In The Otter Creek Wilderness, Jamie Schnably

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study evaluated soils of the Otter Creek Wilderness in the Monongahela National Forest. Thirteen sites were sampled and analyzed according to landscape position: three terrace soils (T), four ridgetop soils (R), three sideslope soils with argillic horizons (SSA), and three sideslope soils with cambic horizons (SSC). At each site, one pedon was described and sampled, and biomass data were collected. Standard chemical and physical properties, clay mineralogy, extractable sulfate and sulfated adsorption capacity were analyzed. The SSA soils had the highest pH, the most diverse vegetation, and the highest base saturation. These soils had a low risk for acid …

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Dietary Feedback Effects And Gender Differences In Stages Of Change For Fat And Fiber Intake Behavior, Janis M. Boury Dec 2003

Dietary Feedback Effects And Gender Differences In Stages Of Change For Fat And Fiber Intake Behavior, Janis M. Boury

Graduate Theses, Dissertations, and Problem Reports (ETD)

The stages of change (SOC) model has addressed changes people make to important habits such as smoking or diet. This study had three purposes (a) examining the influence of cultural role expectations for males and females on decisional balance (DB), (b) examining changes in stage assignment following feedback for the hidden nutrients of fat and fiber, (c) comparing the effects of feedback and tailored messages on change in fat and fiber intakes.;This study was an experimental control group design with 273 participants at baseline, 235 at intervention, and 197 at post-intervention. Most participants had some college. Baseline included general and …

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Late Embryonic And Fetal Mortality In The Ewe, Alison Brown Dixon Aug 2003

Late Embryonic And Fetal Mortality In The Ewe, Alison Brown Dixon

Graduate Theses, Dissertations, and Problem Reports (ETD)

Timing and factors associated with late embryonic and fetal loss in the ewe were examined with ultrasonography. In study one, pregnancy diagnosis and counts of embryos were conducted on days 25, 45, 65, and/or 85 of gestation and compared to lambs born at term. Preliminary results indicated that more potential offspring were lost during fetal development than during late embryonic development. Approximately 18% of ewes experienced late embryonic and fetal loss and 20% of embryos or fetuses were lost from day 25 to term. Losses of potential offspring were continuous throughout gestation and approximately 3% of embryos present on day …

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Bone Fracture Toughness Of Estrogen Deficient Rabbits, Matthew S. Smith Aug 2003

Bone Fracture Toughness Of Estrogen Deficient Rabbits, Matthew S. Smith

Graduate Theses, Dissertations, and Problem Reports (ETD)

Bone mass is commonly used as an indicator of fracture risk. It has been shown in numerous studies that bone loss causes increased bone fragility and risk of fracture. It has also been shown that 50% of patients with osteoporotic vertebral compression fractures have the same bone mass as normal age matched controls. Thus, bone mass alone is not the only indicator of bone quality and ability to resist fracture.;The objective of this study was to qualitatively assess bone's mechanical and histomorphometric changes with drug treatment, and estrogen deficiency, using fracture toughness, femoral neck fracture and histomorphometric analysis in an …

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Effluent Characterization Of Flow-Through Aquaculture Operations In West Virginia, James H. Cunningham Aug 2003

Effluent Characterization Of Flow-Through Aquaculture Operations In West Virginia, James H. Cunningham

Graduate Theses, Dissertations, and Problem Reports (ETD)

In order to reduce pollutant loading nationwide, the U.S. Environmental Protection Agency (EPA), working in conjunction with the U.S. Department of Agriculture (USDA), is in the process of developing effluent management guidelines and standards for private and public aquaculture operations. The purpose of this study is to provide industry, State, and Federal stakeholders with baseline effluent water quality data specific to West Virginia flow-through facilities, in an effort to help concerned parties make informed decisions regarding impending regulations and to examine the potential to increase production, based on effluent pollutant load and permit limitations.;WVU-CEE researchers examined both large and small-scale …

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Evaluation Of Regulated Emissions From Heavy-Duty Diesel Vehicles In The South Coast Air Basin, Thomas M. Buffamonte Aug 2003

Evaluation Of Regulated Emissions From Heavy-Duty Diesel Vehicles In The South Coast Air Basin, Thomas M. Buffamonte

Graduate Theses, Dissertations, and Problem Reports (ETD)

It is important to know how heavy-duty diesel vehicles affect the air quality in the United States. Twenty-five heavy-duty diesel vehicles in the CRC E55/59 Phase I study were tested on the Urban Dynamometer Driving Schedule (UDDS), AC50/80 and the Heavy Heavy-Duty Diesel Truck (HHDDT) Schedule using the West Virginia University Transportable Emissions Laboratory (TransLab). Every vehicle in the CRC E55/59 Phase I study was tested at 30,000 lbs. (Unladen) and 56,000 lbs. (Laden) on the HHDDT, except for one tanker truck that was tested at 45,000 lbs (Laden). Also, the first thirteen vehicles in the study were tested on …

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Factors Influencing Participation In The Beef Quality Assurance Program Of The West Virginia Cooperative Extension Service, Sara D. Peacock Aug 2003

Factors Influencing Participation In The Beef Quality Assurance Program Of The West Virginia Cooperative Extension Service, Sara D. Peacock

Graduate Theses, Dissertations, and Problem Reports (ETD)

The purpose of this study was to identify factors that contribute to participation in the West Virginia Beef Quality Assurance program. This study explored barriers and encouragers that affected involvement in educational programs offered by the West Virginia Cooperative Extension Service. The population consisted of 387 West Virginia Beef Producers from the West Virginia Young Sire Performance Evaluation Program mailing lists. The sample consisted of 85 producers randomly selected from the accessible population and 85 responses to the survey were completed. It was found that the average BQA farmer had a higher net income from their farming practices and had …

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Dietary Patterns, Exercise Behaviors And Osteoporosis Knowledge Of College Women At West Virginia University, Jamie Sutton Deem Aug 2003

Dietary Patterns, Exercise Behaviors And Osteoporosis Knowledge Of College Women At West Virginia University, Jamie Sutton Deem

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study was conducted to describe the dietary patterns, exercise behaviors and osteoporosis knowledge of college women at West Virginia University. One hundred forty-one women were recruited (ages 18--27). Mean intake of nutrients including calcium (860 +/- 369 mg/day) was reported. Calcium intake was significantly lower than the recommendation (1000 mg/day; p < 0.0001). Mean reported exercise time was 54.4 minutes/day. This was significantly greater than the recommendation of 30 minutes/day (p < 0.01). Osteoporosis knowledge was measured by questionnaire. The majority of participants were able to identify 7/14 risk factors. A T-test indicated that individuals who answered osteoporosis risk factor questions correctly had higher intakes of calcium, but were still significantly below the recommendation (p < 0.001). Results indicated that exercise time was significantly higher in individuals who answered osteoporosis risk factor questions correctly (p < 0.001). These results suggest that college women do not have adequate intakes of calcium or knowledge of osteoporosis for prevention of the disease.

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Raptor Assemblage, Abundance, Nesting Ecology, And Habitat Characteristics Under Intensive Forest Management In The Central Appalachian Mountains, Rebecca D. M. Smith Aug 2003

Raptor Assemblage, Abundance, Nesting Ecology, And Habitat Characteristics Under Intensive Forest Management In The Central Appalachian Mountains, Rebecca D. M. Smith

Graduate Theses, Dissertations, and Problem Reports (ETD)

Raptor abundance and diversity were examined in three treatments (20-, 40-, and 80-yr harvest rotations) on an industrial forest in the central Appalachian Mountains. I conducted diurnal broadcast surveys, compared nocturnal survey protocols, examined habitat characteristics at two spatial scales (564 m and 1000 m buffers), and described nesting ecology (including prey composition) of 3 species of diurnal raptors. I detected 17 species and found no significant differences in abundance among treatment for all raptors. Forest-dwelling species were detected more often than edge-dwelling species and Red-shouldered Hawk (Buteo lineatus) was the most abundant species. Using a Barred Owl vocalization survey …

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Genetic, Metabolic, And Histopathological Studies Of Particle -Associated Respiratory Alterations, Mohamed Mohamedy Ghanem Aug 2003

Genetic, Metabolic, And Histopathological Studies Of Particle -Associated Respiratory Alterations, Mohamed Mohamedy Ghanem

Graduate Theses, Dissertations, and Problem Reports (ETD)

Cytochrome P450s (CYPs) form a superfamily of enzymes crucial for the oxidative metabolism of a wide variety of endogenous and exogenous (xenobiotic) compounds. Cytochrome P4501A1 (CYP1A1) is a member of the CYP1A subfamily that is involved in pulmonary carcinogenesis. CYP1A1 metabolizes polycyclic aromatic hydrocarbons (PAH), such as benzo[a]pyrene in cigarette smoke into DNA-binding reactive metabolites resulting in gene mutation and carcinogenesis. Silicosis and coal workers' pneumoconiosis (CWP) are two pulmonary diseases associated with occupational exposure to silica and coal dust (CD), respectively. Most coal miners are smokers or ex-smokers and epidemiologic studies of coal dust carcinogenesis are confounded by the …

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Epileptiform Bursting In The Disinhibited Neonatal Cerebral Cortex, Jason Eric Wells Aug 2003

Epileptiform Bursting In The Disinhibited Neonatal Cerebral Cortex, Jason Eric Wells

Graduate Theses, Dissertations, and Problem Reports (ETD)

The cerebral cortex, which include the neocortex and hippocampus, is an elaborate neuronal network communicating mainly through glutamate and gamma-aminobutyric acid (GABA). Glutamate, operating via AMPA, kainate, and NMDA receptors excites neurons, and operating via metabotropic glutamate receptors can either increase or decrease the excitation in the neuronal network. GABA, operating through GABAA and GABAB receptors, inhibits the mature neuronal network, and GABAA receptor blockade in the adult cerebral cortex leads to epileptiform bursts. In contrast, in the neonatal cerebral cortex, GABAA has been proposed to function as an excitatory neurotransmitter, and glutamatergic synapses are claimed to be underdeveloped. It …

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Rx Plays Multiple Roles In Eye Development, Vera A. Voronina Aug 2003

Rx Plays Multiple Roles In Eye Development, Vera A. Voronina

Graduate Theses, Dissertations, and Problem Reports (ETD)

The homeobox was first identified as a common feature of Drosophila genes that control pattern formation during embryogenesis. These genes have been implicated in the regional specialization of the developing brain, spinal cord and other body structures. Homeobox gene families are highly conserved and encode DNA-binding regulatory proteins. Certain members of the homeobox gene family, including Pax6, Chx10, Lhx2, Otx2, Six3 and Six6, are crucial for development of the eye. A new family of retinal homeobox genes, Rx, is expressed early in embryogenesis in retinal stem cells. This expression pattern, along with results of overexpression and gene deletion studies, is …

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Gene Expression Profiling In Prepubertal And Adult Male Mice Using Cdna And Oligonucleotide Microarrays, Lisa Marie Tomascik-Cheeseman May 2003

Gene Expression Profiling In Prepubertal And Adult Male Mice Using Cdna And Oligonucleotide Microarrays, Lisa Marie Tomascik-Cheeseman

Graduate Theses, Dissertations, and Problem Reports (ETD)

Variations in gene expression are the basis of differences in cell and tissue function, response to DNA damaging agents, susceptibility to genetic disease, and cellular differentiation. The purpose of this dissertation research was to characterize variation in basal gene expression among adult mouse tissues for selected stress response, DNA repair and damage control genes and to utilize variation in temporal gene expression patterns to identify candidate genes associated with germ cell differentiation from mitosis through meiosis in the prepubertal mouse testis. To accomplish these goals, high throughput analyses of gene expression were performed using custom cDNA and random oligonucleotide microarrays. …

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Effects Of Artificial Neural Networks Characterization On Prediction Of Diesel Engine Emissions, Azadeh Tehranian May 2003

Effects Of Artificial Neural Networks Characterization On Prediction Of Diesel Engine Emissions, Azadeh Tehranian

Graduate Theses, Dissertations, and Problem Reports (ETD)

More than a century after its invention, diesel remains the fuel of choice for buses and freight trucks. Diesel exhaust contains three gases that are regulated by the United States Environmental Protection Agency (EPA), as well as particulate matter (PM). There is a societal need both to lower emissions and to predict or model emissions more accurately for inventory purposes. Engine modeling, and real time control are the most indispensable steps towards lowering engine emissions, and it is argued that this modeling can be achieved by implementation of Artificial Neural Networks (ANN). Effects of ANN design, architecture, and learning parameters …

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Changes In Immune Cell Populations And The Antibody Response To Streptococcus Pneumoniae After Exposure To A Mixture Of Herbicides, Patricia De La Rosa May 2003

Changes In Immune Cell Populations And The Antibody Response To Streptococcus Pneumoniae After Exposure To A Mixture Of Herbicides, Patricia De La Rosa

Graduate Theses, Dissertations, and Problem Reports (ETD)

The environment that we live in is composed of many different chemicals, Because of this, all chemical exposures, whether environmental or industrial, are exposures to mixtures. These mixtures have the potential to affect the immune system in a manner that is qualitatively or quantitatively different from the response to the individual components of the mixture. My experiments examine the effects of in vivo exposure to a mixture of herbicides on immune cell populations and on the humoral immune response to immunization with heat killed, whole-cell, Streptococcus pneumoniae (HKSP). The herbicide propanil (3,4-dichloropropionanilide) is sold as a mixture with the herbicide …

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Loss Count, Sonya Corin Russomanno May 2003

Loss Count, Sonya Corin Russomanno

Graduate Theses, Dissertations, and Problem Reports (ETD)

My prints encompass themes of loss of past experiences, poetics, repetition, and feeling. By remembering facts from past experiences, one can recall how a particular moment felt. My intention when producing a piece of work is to generalize themes of loss, time, and memory by using visual features of pattern, space, and repetition of forms to exemplify feelings in relation to loss, time, and memory. This thesis statement will first address themes of loss, time, memory, and the visual devices that are employed with one intention, that they exemplify features crucial in my work. In addition, I will address the …

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Enhancing The Effectiveness Of The Utility Energy Supply Chain In Integrated Steel Manufacturing, Girish Sudhir Bhave May 2003

Enhancing The Effectiveness Of The Utility Energy Supply Chain In Integrated Steel Manufacturing, Girish Sudhir Bhave

Graduate Theses, Dissertations, and Problem Reports (ETD)

The iron and steel industry is energy intensive. The steel industry accounts for 2--3 of total US energy consumption. The energy costs account for 12--15% of the total cost of manufacturing steel. Cogeneration is done by most of the integrated steel producers for on-site electricity generation. The steel industries use different utility systems, and 90% of the industry uses standard steam boilers, steam turbines and BOP (Basic Oxygen Process). The boilers produce steam which is used for power generation and production processes. The system consumes oil, natural gas and blast furnace gas (BFG) to produce this steam and electricity. It …

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Inhalation Exposure System For Diesel Exhaust Particulates, Jay Michael Sherman May 2003

Inhalation Exposure System For Diesel Exhaust Particulates, Jay Michael Sherman

Graduate Theses, Dissertations, and Problem Reports (ETD)

The objectives of this research were twofold. First, a Hazelton 2000 Inhalation Chamber was modified to minimize the amount of diesel exhaust particulate (DEP) needed for animal inhalation exposures. Second, instrumentation was evaluated for aerosolizing DEP, monitoring the mass concentration and size distribution, and determining the uniformity of the aerosol.;The Jet-O-Mizer jet mill produced a single mode DEP mass median diameter (MMD) of 0.33 mum while maintaining a relatively steady mass concentration of 10 mg/m3. The uniformity of a carbon black aerosol was found to vary from 9.9 mg/m3 in the front part of the chamber, to 10.4 mg/m3 in …

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Reinforcement And Punishment During Programmed Instruction, Stephen C. Scherer May 2003

Reinforcement And Punishment During Programmed Instruction, Stephen C. Scherer

Graduate Theses, Dissertations, and Problem Reports (ETD)

Recommendations for improving answer accuracy during programmed instruction have included the use of punishment to decrease the rate of students' responding and to prevent careless mistakes. The effects of punishment during programmed instruction, however, have not been clearly identified. There is evidence that punishment increases attention and decreases response rates during learning tasks, but other effects on student responding, including escape from the learning task, have not been systematically examined. The present study was designed to systematically examine the effects of punishment as well as extinction during programmed instruction. Four college students were recruited to earn money while working on …

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Dietary Factors Influencing Iron Status Among Wic Participants Ages 6--24 Months, Marci Stayner Cannon May 2003

Dietary Factors Influencing Iron Status Among Wic Participants Ages 6--24 Months, Marci Stayner Cannon

Graduate Theses, Dissertations, and Problem Reports (ETD)

Iron deficiency is a nationwide concern. Dietary strategies issued by national organizations, aim to help prevent childhood iron deficiency. This study examined the relationship of dietary factors with iron status in WIC participants 6--24 months. This was a cross-sectional study of 50 rural infants and toddlers.;Iron deficiency was determined from one blood sample analyzed for serum ferritin (SF) and transferrin saturation (TS). Iron deficiency was defined as SF ≤ 15 ug/dL and TS ≤ 15%. Two, 24-hour dietary recalls were collected. Stepwise logistic regression was used to evaluate factors predictive of iron status.;Thirteen children (26%) were iron deficient. Iron status …

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Cellular Specializations For Sound Localization, Kevin C. Rowland May 2003

Cellular Specializations For Sound Localization, Kevin C. Rowland

Graduate Theses, Dissertations, and Problem Reports (ETD)

One of the key elements in auditory perception is the localization of sounds in space. The major cues used for localizing sounds in the azimuthal plane have long been recognized as interaural differences in time of arrival of a sound and amplitude differences between the two ears (Rayleigh 1907; Thompson 1878). High frequency sounds are reflected by the head and thereby produce interaural level differences (ILDs) that are used for localization. The head does not reflect low frequency sounds and so interaural timing differences (ITDs) are used. One of the cell groups of the auditory brainstem, the medial superior olive …

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Telecommunication Of Stabilizing Signals In Power Systems, Guillaume Julien Raux May 2003

Telecommunication Of Stabilizing Signals In Power Systems, Guillaume Julien Raux

Graduate Theses, Dissertations, and Problem Reports (ETD)

Deregulation of the power industry has occurred at a rapid pace, opening some promising competition between suppliers. The result of this competition should be to the benefit of customers.;Telecommunication plays a crucial role in integrating systems and ensuring smooth operation by way of exchanging data and information between various systems that are responsible for monitoring and control of the grid. For example, a Power System Stabilizer (PSS) controller could be placed at one of the generators and requires remote measurements. All the communication schemes within the network generate delays that are characterized in this project using OPNET Modeler. OPNET Modeler …

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Evaluating The Cost-Effectiveness Of St. John's Wort Versus Fluoxetine For The Treatment Of Mild To Moderate Depression, Lee Ann Thayer May 2003

Evaluating The Cost-Effectiveness Of St. John's Wort Versus Fluoxetine For The Treatment Of Mild To Moderate Depression, Lee Ann Thayer

Graduate Theses, Dissertations, and Problem Reports (ETD)

The objective of this study was to determine the cost-effectiveness of St. John's Wort compared to fluoxetine from a third party perspective for the treatment of mild to moderate depression. Fluoxetine 20 mg daily was compared to St. John's Wort 300 mg thrice daily in a decision tree modeling depression management in the outpatient setting. Probabilities were obtained from a Medline search as well as input from an expert panel. Direct medical costs were obtained from medical offices in the Connecticut area with drug and herb cost based on 2002 published data. Several sensitivity analyses were performed. The cost-effectiveness ratio …

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Wildlife Use And Habitat Quality Of Back Channel Areas Associated With Islands On The Ohio River, West Virginia, Andrew Karl Zadnik May 2003

Wildlife Use And Habitat Quality Of Back Channel Areas Associated With Islands On The Ohio River, West Virginia, Andrew Karl Zadnik

Graduate Theses, Dissertations, and Problem Reports (ETD)

The islands and associated back channels on the Ohio River have long been thought to provide important habitat characteristics for riparian wildlife. However, few studies have quantitatively evaluated this importance. As pressure continues to develop back channel areas for commercial and residential use, quantitative information is vital for natural resource managers to justify conserving these areas for wildlife. The goals of my study were to quantify wildlife use of back and main channels relative to waterbirds, anurans, turtles, and riparian furbearing mammals, and to evaluate the habitat quality of back and main channels through the use of habitat suitability index …

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Studies On The Effects Of Propanil On Macrophage Function And Signaling, Laura Lynn Frost May 2003

Studies On The Effects Of Propanil On Macrophage Function And Signaling, Laura Lynn Frost

Graduate Theses, Dissertations, and Problem Reports (ETD)

Propanil has been shown to induce numerous manifestations of impaired immune responses. This dissertation focuses on the effects of propanil on TNF-alpha production and NFB activation in murine and human macrophages in response to LPS stimulation. Initial studies demonstrated that propanil treatment of the murine peritoneal macrophage cell line, IC-21 resulted in decreased NF-kappaB activation and transcriptional activity as determined by Western blot and NF-kappaB-dependent reporter gene transcription, respectively. Nuclear localization of NF-kappaB was also shown to be decreased by immunofluorescence. Additional studies to confirm these effects in the human cell line, THP-1 also showed decreased nuclear levels of NF-kappaB …

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Influence Of Sward Height, Daily Timing Of Concentrate Supplementation And Grazing Time Management On Pasture Utilization Of Lactating Beef Cows, Ondieki James Gekara May 2003

Influence Of Sward Height, Daily Timing Of Concentrate Supplementation And Grazing Time Management On Pasture Utilization Of Lactating Beef Cows, Ondieki James Gekara

Graduate Theses, Dissertations, and Problem Reports (ETD)

To establish the effect of sward height, concentrate feeding time and grazing time management on performance of grazing cattle, thirty-two cross-bred beef (24 Angus and 8 Hereford) cows (632 kg BW) and calves (104 kg BW) were grouped by weight and calving date. They were randomly assigned to two sward height (SH) treatments (4 to 8 or 8 to 12 cm), replicated four times. The cows were fed a concentrate supplement (4.1 kg DM·cow -1·d-1) in the AM at 0700 h or PM at 1800 h (T), and either restricted to 12 h/d grazing (0700 to 1900 h) or unrestricted …

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