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Agriculture, Environmental Restoration And Ecosystem Services: Assessing The Costs Of Water Storage On Agricultural Lands In South Florida, Kayla Ouellette Mar 2014

Agriculture, Environmental Restoration And Ecosystem Services: Assessing The Costs Of Water Storage On Agricultural Lands In South Florida, Kayla Ouellette

Graduate Theses and Dissertations

A large part of the environmental restoration required by the Comprehensive Everglades Restoration Plan calls for more water-storage on lands south of Lake Okeechobee in order to restore the natural water flows of the Everglades watershed. The Everglades Agricultural Area (EAA) can be used for increased water storage in order to relieve coastal estuaries of excess water in the rainy season. This water storage can deliver additional ecosystem services of soil retention and reduced CO2 emissions that could compensate farmers for the cost of water storage by increasing long term farm profitability. The goals of this study were 1) to ...


Toward A Collaborative Model Of Surface Water Management: Lessons From The Boone River Watershed Nutrient Management Initiative, Stephanie Enloe Jan 2014

Toward A Collaborative Model Of Surface Water Management: Lessons From The Boone River Watershed Nutrient Management Initiative, Stephanie Enloe

Graduate Theses and Dissertations

Though productive, Iowa agriculture contributes substantially to nitrogen, phosphorous, and sediment pollution in local surface waters and the Gulf of Mexico. In response to local and national concern over surface water quality, in 2013 the State of Iowa approved the Iowa Nutrient Reduction Strategy and is working to engage Iowa farmers to protect water resources. The Boone River watershed (BRW) initiative in central Iowa was recently designated a demonstration site for the reduction strategy, as diverse public, private, and non-profit partners have been involved in the BRW for over a decade. To inform management decisions in the BRW and other ...


Stage Of Maturation, Crop Load, And Shoot Density Affect The Fruit Quality Of Cold-Hardy Grape Cultivars, Randall Vos Jan 2014

Stage Of Maturation, Crop Load, And Shoot Density Affect The Fruit Quality Of Cold-Hardy Grape Cultivars, Randall Vos

Graduate Theses and Dissertations

Wine grape production in the Upper Midwest and other cold-climate regions is increasing due to the release of cold-hardy grape cultivars that are interspecific hybrids. Grape production practices for Vitis vinifera L. cultivars in regions with long growing seasons, such as California, are standardized more than in other regions due to the extensive amount of research on cultivars of V. vinifera. In spite of that, few researchers document changes in grape composition as fruits mature, and those that do primarily only report soluble solids, pH, and titratable acidity.

Two experiments were designed to examine the changes in soluble solids, pH ...


Genetic Parameters For Pre-Fresh Intake And The Effects Of Lameness On Feed Intake And Milk Production In Dairy Cattle, Brittany Nicole Shonka Jan 2014

Genetic Parameters For Pre-Fresh Intake And The Effects Of Lameness On Feed Intake And Milk Production In Dairy Cattle, Brittany Nicole Shonka

Graduate Theses and Dissertations

Dry matter intake (DMI) is an important topic of research in dairy cattle. It is often studied relative to feed efficiency and disease. However, there are gaps in the current knowledge of DMI that remain to be filled. The objectives of the current study aimed to fill these gaps by estimating genetic parameters for DMI during the pre-fresh transition period, as well as examining the impact of lameness on DMI and milk production. In the current study, DMI during the dry period was moderately heritable, and had a high genetic correlation with lactating intake. This finding indicates DMI may be ...


Genome-Wide Association Studies To Dissect The Genetic Architecture Of Yield-Related Traits In Maize And The Genetic Basis Of Heterosis, Jinliang Yang Jan 2014

Genome-Wide Association Studies To Dissect The Genetic Architecture Of Yield-Related Traits In Maize And The Genetic Basis Of Heterosis, Jinliang Yang

Graduate Theses and Dissertations

This dissertation includes a general introduction (Chapter 1), three journal manuscripts (Chapters 2 to 4) and a section of general conclusions (Chapter 5). The paper in Chapter 2, which compares three statistical approaches for conducting GWAS and identifies the genetic architecture controlling for KRN trait, has been submitted for publication. I made major contributions include designing and performing the experiments, analyzing data and writing the manuscript under the guidance of Dr. Schnable. Dr. Nettleton and Dr. Dekkers provided technical support and conceptual advice for this work. The paper in Chapter 3, which investigates the modes of inheritance of trait-associated variants ...


Deciphering The Genetic Architecture Of Native Resistance And Tolerance To Western Corn Rootworm Larval Feeding, David Alan Hessel Jan 2014

Deciphering The Genetic Architecture Of Native Resistance And Tolerance To Western Corn Rootworm Larval Feeding, David Alan Hessel

Graduate Theses and Dissertations

Plants can exploit complex suites of biochemical, morphological, and physiological mechanisms to defend against herbivory. This research expands that body of knowledge by investigating mechanisms of defense in maize (Zea mays) against one of its most economically important pests, the western corn rootworm (Diabrotica virgifera virgifera, WCR). Natural variation for resistance and tolerance to WCR larval herbivory has been previously reported; however, characterization of the underlying genetic architecture has remained elusive. The results from three separate studies are presented that confirm heritable variation exists for WCR resistance that is both experimentally tractable and reproducible. The findings highlight that both genetic ...


People In Ecosystems/Watershed Integration: Visualizing Ecosystem Services Tradeoffs In Agricultural Landscapes, Carrie Michelle Chennault Jan 2014

People In Ecosystems/Watershed Integration: Visualizing Ecosystem Services Tradeoffs In Agricultural Landscapes, Carrie Michelle Chennault

Graduate Theses and Dissertations

Educational modeling in agricultural and environmental sciences provides access to the scientific knowledge needed to address local and global challenges that affect human wellbeing. Ecosystem services tradeoffs frameworks can enhance wellbeing by facilitating agricultural landscape design to produce multiple ecosystem services while maintaining farmer profitability and mitigating risk to farmers. At present, few broadly accessible tools evaluate how changes to land management affect the types and levels of ecosystem services delivered to humans. I developed a tool, People in Ecosystems/Watershed Integration version 2 (PE/WI or PE/WI v2), to fill this gap and foster multidimensional and integrative land ...


3d Machine Vision System For Robotic Weeding And Plant Phenotyping, Ji Li Jan 2014

3d Machine Vision System For Robotic Weeding And Plant Phenotyping, Ji Li

Graduate Theses and Dissertations

The need for chemical free food is increasing and so is the demand for a larger supply to feed the growing global population. An autonomous weeding system should be capable of differentiating crop plants and weeds to avoid contaminating crops with herbicide or damaging them with mechanical tools. For the plant genetics industry, automated high-throughput phenotyping technology is critical to profiling seedlings at a large scale to facilitate genomic research. This research applied 2D and 3D imaging techniques to develop an innovative crop plant recognition system and a 3D holographic plant phenotyping system.

A 3D time-of-flight (ToF) camera was used ...


Secondary School Agricultural Teachers Understanding Of The Differences Between Agricultural Awareness And Agricultural Literacy In Iowa, Ashley Nicole Eason Jan 2014

Secondary School Agricultural Teachers Understanding Of The Differences Between Agricultural Awareness And Agricultural Literacy In Iowa, Ashley Nicole Eason

Graduate Theses and Dissertations

The focus of this study was an assessment of the understanding of the concepts of agricultural awareness and agricultural literacy as perceived by agricultural education teachers. The purpose of this study was to identify perceptions of agriculture teachers regarding the understanding of the concepts of agricultural awareness and agricultural literacy in the study of agriculture in the state of Iowa. To also develop consensus definitions of agricultural awareness and agricultural literacy. Data provide information for development of a framework for education in and about agriculture and the life sciences. We can conclude from the study there is no consensus definition ...


Evaluating Horticultural Practices For Sustainable Tomato Production In Kamuli, Uganda, Sharon Mbabazi Tusiime Jan 2014

Evaluating Horticultural Practices For Sustainable Tomato Production In Kamuli, Uganda, Sharon Mbabazi Tusiime

Graduate Theses and Dissertations

Tomatoes are a source of income and food security for small-landholder farmers across Uganda, including the Kamuli District. Studies regarding sustainable practices are needed to increase production of the crop and improve farmers' livelihoods. This study investigated three tomato cultivars, Heinz 1370, Nuru F1, and MT 56, pesticide application, staking, and mulching for their effect on yield, disease severity and gross margin of tomato production in the Kamuli District of Uganda. The treatments were tested in a randomized complete block design with a factorial and split-plot arrangement during two growing seasons in 2013. Total and marketable fruit number, marketable fruit ...


Investigating The Causes Of Foam Formation In Deep Pit Swine Manure Storages, Mark Benjamin Van Weelden Jan 2014

Investigating The Causes Of Foam Formation In Deep Pit Swine Manure Storages, Mark Benjamin Van Weelden

Graduate Theses and Dissertations

The appearance of foam on the surface of deep pit swine manure storages throughout the United States and Canada is a serious concern for the pork industry. In addition to logistical issues caused by foam accumulation in deep pits, manure foam has the capacity to trap gases produced by the anaerobic decomposition of manure, leading to dangerous flammable gas concentrations upon agitation or foam disturbance. Recent flash fires and explosions at several swine facilities have created a pressing need to understand and mitigate the causes of foaming deep pits.

A number of hypotheses regarding the contributing factors of foam formation ...


Perceptions Regarding Importance And Frequency Of Use Of Selected Communication Tools By Iowa Cattle Producers, Jaclyn F. Tweeten Jan 2014

Perceptions Regarding Importance And Frequency Of Use Of Selected Communication Tools By Iowa Cattle Producers, Jaclyn F. Tweeten

Graduate Theses and Dissertations

New technologies have profoundly affected the agricultural industry in the twentieth century. Within the agriculture industry numerous forms of communication exist. Forms of communication accessible to cattle producers and industry leaders include face-to-face, print media, electronic media, and social media. With several communication tools available to producers it is imperative to understand producers' perceived importance and usage of these communication tools. Understanding the usage of communication tools by cattle producers will help beef industry partners, beef breed associations, and the overall beef industry to better communicate with producers. Nonetheless, if electronic forms of communication provide quick access to information, one ...


Exploring Critical Thinking Skills Among Undergraduate Agriculture Education And Studies Students, Dustin Kensel Perry Jan 2014

Exploring Critical Thinking Skills Among Undergraduate Agriculture Education And Studies Students, Dustin Kensel Perry

Graduate Theses and Dissertations

The purpose of this dissertation was to describe the current critical thinking abilities of undergraduate agriculture education and studies students, and to explore how entry pathway and enrollment in a capstone course affect these abilities. Objectives were to: (1) establish a departmental benchmark for the critical thinking abilities of senior-level agricultural education and studies students; (2) determine if entry pathway, direct from high school admittance versus transfer from community college admittance, has an effect on critical thinking abilities; and (3) examine the impact a semester-long capstone farm management course has on the development of critical thinking abilities.

For objectives one ...


Pesticide Retention By Buffer Strips Receiving Simulated Runoff Containing Different Sized Sediment, Kapil Arora Jan 2014

Pesticide Retention By Buffer Strips Receiving Simulated Runoff Containing Different Sized Sediment, Kapil Arora

Graduate Theses and Dissertations

Infiltration water and sediment mass retained are the two key processes for pesticide mass retention by buffer strips from agricultural runoff, based on the review of 106 published articles. Estimates, based on average published data for runoff volume and sediment mass retention, show that the average pesticide retention is 46, 51, and 70 % for the three sorption classes (Koc<100, 1001000, respectively). Source area to buffer area ratios ranging between 10:1 to 50:1 are more practical and effective under field applications of buffer strips. Buffer strips have an upper area where larger particles settle and a lower area where runoff containing fine particles passes through. Rainfall-runoff experiments were conducted on 1.0 m wide x 5.6 m long switchgrass buffer strips to measure pesticide mass transport through buffer strips receiving runoff containing different sized sediment under steady-state rainfall intensity of 6.35 cm/h. Twenty four strips were used to provide three replications each of the sediment type treatments of fine sand, fine aggregates, clay-sized particles, and no sediment; and two treatments of flow convergence represented by source area to buffer area ratios of 10:1 and 30:1. Atrazine, chlorpyrifos, and linuron were used in the experiments at the label recommended rates using field formulations. When receiving runoff mixed with fine sand, buffer strips retained 73% and 53% atrazine, 87% and 80% chlorpyrifos, and 81% and 54% linuron for the two area ratios of 10:1 and 30:1 respectively. The corresponding numbers, when receiving runoff mixed with fine aggregates, were 72% and 54% atrazine, 87% and 71% chlorpyrifos, and 76% and 58% linuron respectively for the two area ratios. Switchgrass buffer strips retained, on average, 70.1% and 49.2% atrazine, 83.0% and 57.6% chlorpyrifos, and 71.2% and 50.4% linuron, respectively for the two area ratios of 10:1 and 30:1 when receiving simulated runoff containing clay-sized particles. Linuron data presented in these experiments is an estimate and readers are cautioned when interpreting linuron data. Results were significantly different for atrazine when the two area ratios were compared for all three sediment types. Results for chlorpyrifos and linuron were not significantly different between the two area ratios indicating the strips performed equally well under both flow conditions in case of sediment type fine sand and fine aggregates. In case of clay-sized particles, results for atrazine and linuron were significantly different for the two area ratios indicating flow convergence can impact atrazine and linuron retention by buffer strips. In case of fine sand, outflow from the buffer strips showed some re-entrainment of sediment from previously deposited sediment, buffer strip soil, or erosion at the exit point, which needs to be further investigated. Infiltration and sediment retention were the key processes for pesticide retention in case of fine aggregates, whereas infiltration alone was the key process in case of fine sand and clay-sized particles. VFSMOD-W, embedded with the empirical linear-additive pesticide mass retention model was used to predict atrazine, chlorpyrifos and linuron retention by the switchgrass buffer strips studied in the experiments. Saturated hydraulic conductivity (Ksat) of the switchgrass soil was the key parameter in calibrating the model to the experimental conditions, indicating type of buffer strip vegetation and timing of calibration data collection are important factors. Predicted pesticide mass retention results indicate that the performance of buffer strips receiving runoff from farm fields containing large proportions of fine sand or clay-sized particles needs to be further investigated.


Native Mice In A Novel Ecosystem: Morphology, Behavior, And Sociology Predict The Role Of Prairie Deer Mice In Agriculture, John Watson Doudna Jan 2014

Native Mice In A Novel Ecosystem: Morphology, Behavior, And Sociology Predict The Role Of Prairie Deer Mice In Agriculture, John Watson Doudna

Graduate Theses and Dissertations

Corn-soybean agriculture, the annual rotation of corn planted as a monoculture and then soybean planted as a monoculture, in the Midwestern US represents a novel ecosystem to native species that utilize the habitat. In order to successfully colonize this habitat, native species have had to adapt or maintain pre-adaptations to the novel ecosystem. The prairie deer mouse (Peromyscus maniculatus bairdii) is a model organism for studying the adaptations of species to corn-soybean agriculture. They also provide a potentially economically valuable ecosystem service of weed seed predation. Thus, studying the adaptations and behaviors of this species are of critical importance. This ...


Assessing Monitoring And Modeling Approaches To Improve Water Quality In The Hickory Grove Lake, Rohith Gali Jan 2014

Assessing Monitoring And Modeling Approaches To Improve Water Quality In The Hickory Grove Lake, Rohith Gali

Graduate Theses and Dissertations

Surface water quality regulated by agricultural pollution remains to be an important environmental concern around the world. Major contaminants from agriculture systems such as bacteria, sediment, and nutrients (nitrogen and phosphorus) continue to affect the designated use of a waterbody. As per the Clean Water Act legislation, water quality impairments must be addressed through the Total Maximum Daily Load (TMDL) approach. The TMDL program is a comprehensive and watershed-scale approach involving contaminant source identification and quantification, and conservation practice recommendation to reduce contaminant transport. The overall goal of this study was to improve the TMDL development process in achieving water ...


Anion Exchange Capacity Of Biochar, Michael Lawrinenko Jan 2014

Anion Exchange Capacity Of Biochar, Michael Lawrinenko

Graduate Theses and Dissertations

Nutrient loss, specifically of nitrate and phosphate, from agricultural land often incurs harmful consequences for environmental and groundwater quality and many efforts have been attempted to reduce the discharge of agricultural nutrients to open waters and groundwater, yet no approach has shown to be robust. Biochar has been demonstrated to alter soil properties, thus soils modified with biochar having significant anion exchange capacity (AEC) may exhibit reduced nutrient loss. Our goal in this study was to determine what chemical functional groups contribute AEC to biochar and investigate what production conditions and raw material choices yield biochar with appreciable AEC. Further ...


Perceptions Of Secondary School Agriculture Teachers Regarding Biomass Production Education In Iowa, Guang Han Jan 2014

Perceptions Of Secondary School Agriculture Teachers Regarding Biomass Production Education In Iowa, Guang Han

Graduate Theses and Dissertations

With the boom of biorenewable energy, biomass production has become an important segment in agriculture industry (Iowa Energy Center, 2013). A higher workforce will be needed for this burgeoning biomass energy industry (Iowa Workforce Development, n. d.). Instructional topics in agricultural education should take the form of

problems and questions faced by the agriculture industry itself (Phipps, Osborne, Dyer, & Ball, 2008). This study sought to assess the perceptions of secondary agriculture teachers regarding biomass production education in Iowa. Results of this study indicated that teachers held strongly to moderately positive perceptions toward biomass production and moderately positive perceptions toward teaching ...


Organic Agriculture Development Strategies In Tunisia And Uganda: Lessons For African Organics, Jelili Adegboyega Adebiyi Jan 2014

Organic Agriculture Development Strategies In Tunisia And Uganda: Lessons For African Organics, Jelili Adegboyega Adebiyi

Graduate Theses and Dissertations

The core objective of this thesis was to draw lessons from the factors of success that underlie the development of Tunisian and Ugandan organic sectors to advance recommendations that can help spur the development of African organics. The study drew on secondary data obtained from an array of sources, supplemented with clarifying information obtained through phone discussions and email exchanges with organic stakeholders in the two countries. The study framed broad and specific questions aimed at identifying and explaining the roles played by different stakeholders, governmental and non-governmental, in fostering the development of the organic sectors in the two countries ...


The Effects Of Heat Stress On Energetic Metabolism And Insulin Homeostasis, María Victoria Sanz Fernández Jan 2014

The Effects Of Heat Stress On Energetic Metabolism And Insulin Homeostasis, María Victoria Sanz Fernández

Graduate Theses and Dissertations

Heat stress (HS) is a major environmental hazard for human health and animal agriculture. Changes in metabolism and specifically altered insulin action appear to be critical for the adaptation and ultimately survival to a severe heat load. However, our knowledge of the physiological and metabolic consequences of HS is woefully insufficient. Understanding the biology of HS is critical in order to develop treatment protocols and mitigation strategies against its deleterious effects on both humans and livestock. Interestingly, HS elicits a metabolic profile that somewhat resembles models of endotoxemia/sepsis. Moreover, HS negatively affects intestinal health and the subsequent increase in ...


Relationships Between Foliar Applied Micronutrients, Soil And Tissue Tests, And Grain Yield In Soybean, Joshua T. Enderson Jan 2014

Relationships Between Foliar Applied Micronutrients, Soil And Tissue Tests, And Grain Yield In Soybean, Joshua T. Enderson

Graduate Theses and Dissertations

There has been little research with foliar application of micronutrients for soybean [Glycine max (L.) Merr.] in the Corn Belt, and results have been inconsistent. This study's objectives were to (1) evaluate the soybean grain yield response to foliar application of B, Cu, Mn, and Zn; and (2) study relationships between soil and plant-tissue test results for these micronutrients. Forty-two field trials were conducted in Iowa during 2012 and 2013 that involved 23 soil series. Six treatments replicated four times were a control, each nutrient applied separately, and their mixture sprayed twice (at the V6 and R2/R3 growth ...


Impact Of Dietary Fat Intake On Carcass Iodine Value And Pork Fat Quality, Trey Allen Kellner Jan 2014

Impact Of Dietary Fat Intake On Carcass Iodine Value And Pork Fat Quality, Trey Allen Kellner

Graduate Theses and Dissertations

The study between dietary fat intake and pork fat composition is not novel or new. However, details of this relationship are not characterized enough to meet pork carcass fat quality standards. The objective was to more precisely define the relationship between dietary fatty acid intake and pork carcass fat composition. Our hypothesis was that pork carcass fat composition will be highly reflective of fatty acid intake, resulting in daily fatty acid intake proving to be an accurate predictor of pork fat composition. Experiment 1 used 42 gilts and 21 barrows allotted to 7 treatments: 3% and 6% of each of ...


Agronomic Impacts Of Production Scale Harvesting Of Corn Stover For Cellulosic Ethanol Production In Central Iowa, Dustin John Schau Jan 2014

Agronomic Impacts Of Production Scale Harvesting Of Corn Stover For Cellulosic Ethanol Production In Central Iowa, Dustin John Schau

Graduate Theses and Dissertations

This thesis investigates the impacts of corn stover harvest in Central Iowa with regards to nutrient removal, grain yield impacts and soil tilth. Focusing on phosphorus and potassium removal due to production of large, square bales of corn stover, 3.7 lb P2O5 and 18.7 lb K2O per dry ton of corn stover were removed in 2011. P2O5 removal remained statistically the same in 2012, but K2O decreased to 15.1 lb per ton of dry corn stover. Grain cart data showed no statistical difference in grain yield between ...


Genetic Analysis Of The Ibm2syn10-Dh Maize Population For Response To Low And High Nitrogen Input, Pedro José Gonzalez-Portilla Jan 2014

Genetic Analysis Of The Ibm2syn10-Dh Maize Population For Response To Low And High Nitrogen Input, Pedro José Gonzalez-Portilla

Graduate Theses and Dissertations

Maize growth and development depends highly in the capacity of the plants to absorb Nitrogen (N) from the soil. Producing a high-yielding maize crop that requires less N input is currently one important goal of maize breeding programs. In order to understand the dynamics of N use in maize, the study of phenotypic and genetic response to N deficiency must be performed. Using lines from the high resolution IBM2Syn10-DH population, the goals of this study were: 1) to identify the phenotypic response of the root system architecture (RSA) of 14-day old maize seedlings grown under contrasting levels of N; 2 ...


Effects Of Two Feed Additives On Performance, Energy Digestibility, And Body Composition Of First-Cycle Laying Hens Fed Two Concentrations Of Dietary Energy, Alysha Gareis Jan 2014

Effects Of Two Feed Additives On Performance, Energy Digestibility, And Body Composition Of First-Cycle Laying Hens Fed Two Concentrations Of Dietary Energy, Alysha Gareis

Graduate Theses and Dissertations

Three experiments were conducted to determine the effects of feed additives on the performance, energy digestibility, and body composition of first-cycle laying hens fed two concentrations of dietary energy. The first and second experiments were 8 wk in duration. The first experiment contained two dietary energy levels (2,750 and 2,850 kcal/kg) with or without the addition of a mannose rich fraction (MRF) from a specific strain of yeast. As expected, no differences in performance parameters including egg production, egg weight, and egg mass were detected, although increased dietary energy, but not MRF resulted in increased total and ...


Cellular And Molecular Mechanisms Of Chemical-Induced Ovarian Toxicity, Shanthi Ganesan Jan 2014

Cellular And Molecular Mechanisms Of Chemical-Induced Ovarian Toxicity, Shanthi Ganesan

Graduate Theses and Dissertations

The ovary is the ovum-producing female reproductive organ composed of follicles at different stages of development. Chemicals which selectively damage large growing or antral follicles only temporarily interrupt reproductive function because these follicles can be replaced by recruitment from the greater pool of primordial follicles. However, chemicals that destroy oocytes contained in primordial follicles can cause permanent infertility and premature ovarian failure (early menopause in women), since once a primordial follicle is destroyed, it cannot be replaced. We hypothesized that ovotoxic chemicals can bind to DNA to induce DNA damage and that the ovarian cells activate DNA repair, cell cycle ...


Effect Of Oregano Essential Oil And Tannic Acid On Storage Stability And Quality Of Ground Chicken Meat, Marwan Alhijazeen Jan 2014

Effect Of Oregano Essential Oil And Tannic Acid On Storage Stability And Quality Of Ground Chicken Meat, Marwan Alhijazeen

Graduate Theses and Dissertations

ABSTRACT

Lipid and protein oxidations are most important factors that can cause quality deterioration in fresh and cooked poultry meat during storage because many secondary compounds formed by lipid and protein oxidation can cause off-odor and off-flavor production in meat. Several synthetic antioxidants such as butylatedhydroxyanisole (BHA), butylatedhydroxytoluene (BHT), and tertiary butylhydroquinone (TBHQ) have been successfully used to prevent the oxidative changes in meat. In recent years, however, growing number of consumers are more interested in natural antioxidants than synthetic ones because of the potential carcinogenic effects of the latter.

Plant polyphenol extracts are known to have strong antioxidant and ...


Efficiency Study Of Testing And Selection In Progeny-Row Yield Trials And Multiple-Environment Yield Trials In Soybean Breeding, Minghui Sun Jan 2014

Efficiency Study Of Testing And Selection In Progeny-Row Yield Trials And Multiple-Environment Yield Trials In Soybean Breeding, Minghui Sun

Graduate Theses and Dissertations

your words


Heat Stress Alters Animal Physiology And Post-Absorptive Metabolism During Pre- And Postnatal Development, Jay Steven Johnson Jan 2014

Heat Stress Alters Animal Physiology And Post-Absorptive Metabolism During Pre- And Postnatal Development, Jay Steven Johnson

Graduate Theses and Dissertations

Heat stress (HS) is a key limiting factor to efficient animal production and negatively impacts health and development during postnatal life. In addition, hyperthermia during in utero development can permanently alter postnatal phenotypes and negatively impact future animal performance. While the teratogenic effects of prenatal HS have been extensively evaluated, the impact of in utero HS exposure on future mammalian thermoregulation, nutrient partitioning, and bioenergetics is undefined. To determine the postnatal consequences of in utero HS, pregnant first parity sows and rats were exposed to either thermal neutral (TN) or HS conditions for the entire gestation, the first half, or ...


Production Information Needs Of American Boer Goat Association Members In The Midwestern United States, Elise Nicole Gallet De St. Aurin Jan 2014

Production Information Needs Of American Boer Goat Association Members In The Midwestern United States, Elise Nicole Gallet De St. Aurin

Graduate Theses and Dissertations

The goat industry in the United States is growing. The low input costs of production (USDA, 2005) has attributed to the gaining popularity of goats to producers in developed countries, such as the United States. With this growth comes a demand for a quality product to allow producers to compete in a growing world market. Without timely and adequate information producers could get pushed out of the market because of a less than standard product.

The purpose of this study was to determine the adequacy in terms of quality and quantity of the goat production information available to producers. This ...