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Animal science

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Coaching For Success; Iowa Livestock Judging Coaches Manual, Ashley Wiebe Jan 2018

Coaching For Success; Iowa Livestock Judging Coaches Manual, Ashley Wiebe

Creative Components

The purpose of this creative component is to design a tool for 4-H and FFA livestock judging coaches to use to strengthen their team and teach their students. Livestock judging team participation helps students grow in skills including, but not limited to, communication, confidence, animal evaluation, decision-making, competitiveness, self-motivation, organization, self-discipline, and the ability to accept criticism. A manual was put together as visual material coaches could reference and reuse as they choose. Materials were gathered from 20 years of 4-H, FFA and collegiate livestock judging experiences, as well as coaching and studying other successful coaches techniques to training their ...


Menageries Multiple: An Introduction To Zoological Multiplicity In The Modern American Zoo, Emily D. Gratke Jan 2017

Menageries Multiple: An Introduction To Zoological Multiplicity In The Modern American Zoo, Emily D. Gratke

Scripps Senior Theses

American zoological parks have been sites of intense consumer and scholar interest since their origination in the 20th century. Today, zoos reside at a tenacious hub of ideologies, practices, and priorities contributed to by various stakeholder groups. I propose that the foundational cause of this tension is zoological multiplicity: the theory that through human practices and perceptions, animals can embody multiple identities. Via an exploration of zoological multiplicity in American zoos with specific focus on zoo management, zoogoer, and animal activist stakeholder groups, this project proposes the widespread acknowledgment and understanding of zoological multiplicity as a method to improve animal ...


Intake And Digestibility Of Fescue Hay Supplemented With Co-Product Feeds, Omega J. Sanders May 2015

Intake And Digestibility Of Fescue Hay Supplemented With Co-Product Feeds, Omega J. Sanders

Animal Science Undergraduate Honors Theses

Satisfying an animals' nutritional needs can help optimize performance and keep an animal healthy. Meeting these nutritional requirements is often complicated by the low quality characteristics of hay, requiring supplementation with concentrate feedstuffs to offset this low nutrient density. The objectives of this study were to determine the impact of supplementation with soybean hulls (SH), distiller's dried grains with solubles (DDGS), or a 50:50 mixture of the two (MIX) on ruminal fermentation characteristics and in situ forage disappearance in lactating and non-lactating ruminally-cannulated cows offered tall fescue hay. For this experiment, a basal diet of tall fescue hay ...


Effects Of Animal Science Agricultural Education Course Completion On Urban High School Students' Career Choice, Kristina Gowans May 2014

Effects Of Animal Science Agricultural Education Course Completion On Urban High School Students' Career Choice, Kristina Gowans

All Graduate Theses and Dissertations

This study focused on testing the effects of agricultural education on urban high school students’ career choices. It looked into how students view agriculture, how they perceive their peers view agriculture, how their demographics are related to career choice, and if their career choice was changed to a different career upon completion of the study. The study showed a positive relationship between completing an agricultural education class in animal science and interest in going into an agricultural career. Further, females in the study were more likely to choose an agricultural career. After the completion of a school-based agricultural education program ...


Cal Poly Goat Program, Lauren Christensen Apr 2013

Cal Poly Goat Program, Lauren Christensen

Animal Science

The Cal Poly Goat Program was established in the Summer of 2012 to provide vegetation management services on the Cal Poly campus and to allow students to gain hands on experience with goats. Student interest in adding goats as an additional species in the Animal Science Department spurred the realization and development of the program. The department also experienced demand for goats to use for vegetation management at the animal units and around various facilities on campus. The Goat Program integrates Cal Poly’s hands-on, ‘Learn by Doing’ philosophy with sustainable management practices to serve the needs of students as ...


The Role Of Peroxisome Proliferator Activated-Receptor Gamma In Ovarian Function, Lacey Jeanne Luense Jan 2007

The Role Of Peroxisome Proliferator Activated-Receptor Gamma In Ovarian Function, Lacey Jeanne Luense

Retrospective Theses and Dissertations

The transcription factor, peroxisome proliferator activated-receptor γ (PPARγ), regulates many processes critical for normal ovarian function. The role of PPARγ in the ovary was investigated by determining its expression throughout the bovine estrous cycle, and luteal tissue was cultured with agonists and an antagonist of PPARγ to determine its impact on progesterone production. Protein, but not mRNA for PPARγ, was lower in regressing compared to functional luteal tissue. Treatment with a PPARγ agonist decreased progesterone secretion from late phase luteal tissue. These findings indicate that PPARγ may play a role in luteal formation/function, and alter progesterone production during specific ...


Use Of 25-Hydroxyvitamin D3 And Vitamin E And Manipulation Of Dietary Calcium To Improve Tenderness Of Beef , Kristen Marie Carnagey Jan 2006

Use Of 25-Hydroxyvitamin D3 And Vitamin E And Manipulation Of Dietary Calcium To Improve Tenderness Of Beef , Kristen Marie Carnagey

Retrospective Theses and Dissertations

Tenderness is one of the most important quality characteristics of beef. Inconsistent tenderness of beef costs the U.S. beef industry millions of dollars annually. Therefore, a practical method of improving tenderness could increase consumer satisfaction and willingness to purchase beef, which could lead to increased profits to producers. Calpain, the enzyme responsible for postmortem proteolysis, is calcium-dependent; so, increasing intracellular calcium concentrations presumably will result in increased proteolysis and, subsequently, more tender beef. We hypothesized that 500 mg of 25-hydroxyvitamin D3 (25-OH D3) administered as a single oral bolus seven days before harvest would increase calcium concentrations in plasma ...


Use Of Linkage Disequilibrium For Quantitative Trait Loci Mapping In Livestock , Honghua Zhao Jan 2006

Use Of Linkage Disequilibrium For Quantitative Trait Loci Mapping In Livestock , Honghua Zhao

Retrospective Theses and Dissertations

The goal of quantitative trait loci (QTL) mapping in livestock is to find genes underlying traits of economic importance for genetic improvement through marker assisted selection (MAS). The studies presented in this thesis address several important issues in QTL detection and fine mapping using candidate gene analysis and linkage disequilibrium (LD) mapping using high density genotyping. Tests for candidate genes in F2 populations for QTL mapping were developed and evaluated. Results show that the extensive between-breed LD that is present in a cross can result in significant associations for candidate genes at considerable distances from the QTL. Tests that removed ...


Mechanisms Of Lipid Peroxidation In Meats From Different Animal Species , Byungrok Min Jan 2006

Mechanisms Of Lipid Peroxidation In Meats From Different Animal Species , Byungrok Min

Retrospective Theses and Dissertations

The objectives of this study were (1) to determine the elements that make differences in the oxidative stability of meats from different animal species and (2) to determine the major catalysts of lipid peroxidation in meat and meat products. The most important difference in the susceptibility of meat from different animal species to lipid peroxidation was the balance between anti- and pro-oxidative factors in meat. Raw and cooked ground beef were the most susceptible to lipid peroxidation, followed by chicken thigh meat, pork, and chicken breast meat. The high storage stability of chicken breast meat was attributed to a very ...


Characterization And Interactions Of Tbx2 , Christian Nephi Paxton Jan 2006

Characterization And Interactions Of Tbx2 , Christian Nephi Paxton

Retrospective Theses and Dissertations

T-box (Tbx) proteins are dynamically expressed throughout embryogenesis and appear to have significant roles in a number of developmental processes. The T-box family is characterized by a highly conserved DNA binding domain. Over twenty mammalian T-box proteins have been identified, many of which have the demonstrated ability to regulate transcription. Both activators and repressors of gene transcription have been described within this family, but how their functions are performed is largely unknown;Tbx2 is a powerful transcriptional repressor with functional roles identified in cardiogenesis and limb development. However the functional domain(s) of Tbx2 are poorly characterized. Tbx2 contains a ...


Molecular Dissection Of Genomic Regions Influencing Important Economic Traits In The Pig , Antonio Marcos Costa Do Amaral Ramos Jan 2006

Molecular Dissection Of Genomic Regions Influencing Important Economic Traits In The Pig , Antonio Marcos Costa Do Amaral Ramos

Retrospective Theses and Dissertations

Recently, numerous genes and genomic regions associated with pork quality were identified. There is great potential for the pig industry in using information from molecular markers for the improvement of pork quality traits, such as color, marbling and pH. Besides the traditional fresh pork market, the production of dry-cured pork products, like Country Hams, has also increased. We collected data on fresh and dry-cured Country Hams to investigate the relationships between these traits and to analyze the effect of genetic markers on fresh and dry-cured ham processing characteristics. Significant positive correlations between yield and firmness, color, pH and marbling were ...


The Effect Of Reduced Levels Of Inorganic And Organic Trace Mineral Supplementation On Performance, Carcass Traits, And Fecal Excretion Of Grow-Finish Swine , Matthew Lee Wolfe Jan 2006

The Effect Of Reduced Levels Of Inorganic And Organic Trace Mineral Supplementation On Performance, Carcass Traits, And Fecal Excretion Of Grow-Finish Swine , Matthew Lee Wolfe

Retrospective Theses and Dissertations

An experiment was conducted to compare the effect of reduced levels of inorganic and organic trace mineral supplementation on performance, carcass characteristics, and mineral excretion of grow-finish swine. Crossbred pigs were randomly assigned to the following treatments of reduced Cu, Fe, and Zn supplementation: TRT (1) 25% inorganic, TRT (2) 25% organic, TRT (3) 10% inorganic, and TRT (4) 10% organic. In general, pigs fed reduced levels of trace minerals excreted less Cu and Zn. The same can be said for pigs fed organic trace minerals. Organic trace minerals can be supplemented in place of inorganic forms to reduce fecal ...


Investigating Uncured No Nitrate Or Nitrite Added Processed Meat Products , Jeffrey Joseph Sindelar Jan 2006

Investigating Uncured No Nitrate Or Nitrite Added Processed Meat Products , Jeffrey Joseph Sindelar

Retrospective Theses and Dissertations

Samples of different commercial brands (4 uncured, no-nitrate/nitrite-added and one nitrite-added) of three product types (frankfurters, hams and bacons) were evaluated for color, pigment content, pH, lipid oxidation, residual nitrate and nitrite quantity, and consumer acceptance. All samples contained residual nitrate and residual nitrite except for Brands B and D bacons (<1 ppm nitrite). A large variation in severity of lipid oxidation existed between product types within brands with frankfurters reporting the highest levels. Color measurements indicated the majority of products and brands were similar to the control. Consumer sensory ratings determined that variation existed;The effects of varying levels of vegetable juice powder (VJP) and incubation times (MIN-HOLD) on quality characteristics and sensory properties of emulsified frankfurter-style cooked (EFSC) sausages and hams over a 90-day storage period were investigated. Four EFSC sausage treatments (TRT) (TRT1: 0.20% VJP, 30 MIN-HOLD; TRT2: 0.20% VJP, 120 MIN-HOLD; TRT3: 0.40% VJP, 30 MIN-HOLD; TRT4: 0.40% VJP, 120 MIN-HOLD) and a sodium nitrite-added (156 mg/kg) control (C) were identified for this study. No differences for lipid oxidation between any TRTs and C or over time were identified. No differences (P>0.05) for Commission International D'Edairerage (CIE) L* values were found between TRTs. CIE a* and reflectance ratio values revealed TRTs 2, 4 and C were redder and had better cured color than TRTs 1 and 3 at Day 0. Trained sensory intensity ratings determined that all ...


Use Of Qtl Identified In Breed Crosses For Genetic Improvement In Pigs, Napapan Piyasatian Jan 2006

Use Of Qtl Identified In Breed Crosses For Genetic Improvement In Pigs, Napapan Piyasatian

Retrospective Theses and Dissertations

Strategies for the exploitation of multiple QTL identified in breed crosses for genetic improvement of livestock were examined through marker-assisted introgression (MAI) and marker-assisted selection (MAS). Evaluation of the effectiveness of alternate strategies for MAI and MAS were carried out using stochastic computer simulation. In general, introgression of multiple QTL and maintaining the frequency of the donor's allele at 50% requires large population sizes that are not feasible in livestock. An alternate selection approach for MAI of multiple QTL was developed for a breeding program of limited size, without requiring the selected candidates to be heterozygous at all loci ...


Infectious Bovine Keratoconjunctivitis In Angus Cattle , José Eduardo Rodríguez Jan 2006

Infectious Bovine Keratoconjunctivitis In Angus Cattle , José Eduardo Rodríguez

Retrospective Theses and Dissertations

Infectious Bovine Keratoconjunctivitis is a contagious ocular disease that affects cattle worldwide. It is considered the most significant ocular disease in cattle. The economic impact of the disease has been well documented. The available treatments have yet to show their effectiveness in the prevention and/or control of the disease. The objectives of this study were twofold, to evaluate the effects of IBK incidence and severity on production traits such as weaning weight, yearling weight, and carcass traits and to estimate variance components associated with IBK. Our results support previous findings on the effects of IBK on weaning weight. The ...


Comparison Of Calf-Fed Vs. Yearling-Fed Management For The Estimation Of Carcass Trait Genetic Parameters In Simmental Cattle, Richard G. Tait Jr. Jan 2006

Comparison Of Calf-Fed Vs. Yearling-Fed Management For The Estimation Of Carcass Trait Genetic Parameters In Simmental Cattle, Richard G. Tait Jr.

Retrospective Theses and Dissertations

Selection indexes for feedlot performance have been developed by U.S. beef breed associations to help commercial producers with multiple trait selection decisions. The objective of this study was to evaluate the implications of backgrounding cattle after weaning on selection for feedlot profitability. Carcass data records for 11,011 animals and a three generation pedigree were obtained from the American Simmental Association database. Carcass traits of primary interest in this analysis were marbling score (MARB), 12th rib fat thickness (CFT), 12th rib ribeye area (CREA), and hot carcass weight (HCW). Estimated post weaning gain (EPWG) was determined using ...


Analysis Of Genomic Region(S) And Gene(S) Associated With Cranial Cruciate Ligament Rupture In The Dog , Vicki Lea Wilke Jan 2006

Analysis Of Genomic Region(S) And Gene(S) Associated With Cranial Cruciate Ligament Rupture In The Dog , Vicki Lea Wilke

Retrospective Theses and Dissertations

Rupture of the cranial cruciate ligament (CCLR) in the dog is the most common cause of hind limb lameness. When CCLR occurs it results in instability in the knee leading to progressive, debilitating arthritis and lameness. Particular breeds of dogs (e.g. Newfoundland) are predisposed to CCLR while other breeds (e.g. Greyhound) have dramatically reduced frequency of this disorder supporting a heritable basis for the CCLR trait. For this study, we first estimated the economic impact to veterinary clients for the medical and surgical management for CCLR at 1.3 billion in the U.S. in 2003. Next, we ...


Dietary Strategies To Reduce Air Emissions From Laying Hen Operations , Wei Wu-Haan Jan 2006

Dietary Strategies To Reduce Air Emissions From Laying Hen Operations , Wei Wu-Haan

Retrospective Theses and Dissertations

The objectives of the current study were to evaluate the effectiveness of feeding a reduced emission diet (R) containing 6.9% of a gypsum-zeolite mixture and slightly reduced crude protein (CP) to 21-, 38-, and 59-wk old Hy-line W36 hens (trial 1, 2, and 3, respectively) on hen performance, emissions of NH3, H2S, NO, NO2, CO2 , CH4, non-methane total hydrocarbon, and apparent digestibility compared to feeding a commercial diet (C), and to compare different methods of estimating nutrient excretion from laying hens in environmental chambers. At each age, 640 hens were allocated randomly to one of eight environmental chambers for ...


Improved Diagnostics And Clinical Applications For The Detection And Control Of Proliferative Enteropathy , Jeremy James Kroll Jan 2005

Improved Diagnostics And Clinical Applications For The Detection And Control Of Proliferative Enteropathy , Jeremy James Kroll

Retrospective Theses and Dissertations

Lawsonia intracellularis, the etiological agent of proliferative enteropathy (ileitis, PE), is a major cause of economic losses in the global swine industry. Lawsonia intracellularis is a motile, Gram negative, microaerophilic, obligately intracellular pathogen that relies on host cellular interactions for survival and growth. Despite extreme difficulties in isolating L. intracellularis from infected pigs, advancements in the cultivation of this organism in vitro has led to better understanding of the pathogenesis of PE, the development of sensitive and specific diagnostic techniques and methods for the control and prevention of this disease;This dissertation describes the development of a novel enzyme-linked immunosorbent ...


Analysis Of Hoxa5 Expression And Function In Development Of The Central Nervous System , Milan Joksimovic Jan 2005

Analysis Of Hoxa5 Expression And Function In Development Of The Central Nervous System , Milan Joksimovic

Retrospective Theses and Dissertations

The Hox genes encode transcription factors that are indispensable for proper spatio-temporal patterning of the vertebrate body axes. In mouse, Hoxa5 transcripts are differentially expressed in specific mesoderm-derived structures and in the most anterior domain of expression in the central nervous system (CNS). However, the functional significance of any pattern of protein-coding RNAs must be verified by correlating the presence of the protein(s) and RNAs. Here we describe the dynamic pattern of HOXA5 protein during mouse embryogenesis. The HOXA5 protein is detected as early as embryonic day (E) 9.0, and is found, as development proceeds, in several mesoderm-derived ...


Effects Of Oxidation, Ph, And Ionic Strength On Inhibition Of [Mu]- And M-Calpain By Calpastatin , Kasey Rae Maddock Jan 2005

Effects Of Oxidation, Ph, And Ionic Strength On Inhibition Of [Mu]- And M-Calpain By Calpastatin , Kasey Rae Maddock

Retrospective Theses and Dissertations

The objective was to determine the effects of pH, ionic strength, and oxidation on inhibition of mu- and m-calpain by calpastatin. Calcium activated cysteine proteinases, mu- and m-calpain, were evaluated for activity under pH (7.5, 6.5, and 6.0), ionic strength (165 and 295 mM NaCl), and oxidizing (with or without H2O2) conditions in the presence of calpastatin, their inhibitor. Using a fluorogenic peptide, mu-calpain is most active at pH 6.5 and m-calpain is most active at pH 7.5 and 165 mM NaCl. Oxidation with 0.16 muM H2O2 decreased mu- and m-calpain activity. It was ...


Identification Of A Role For Janus Kinase2 (Jak2) In Skeletal Muscle Mitogenesis, Myogenesis, And Hypertrophy , Symantha Ann Anderson Jan 2005

Identification Of A Role For Janus Kinase2 (Jak2) In Skeletal Muscle Mitogenesis, Myogenesis, And Hypertrophy , Symantha Ann Anderson

Retrospective Theses and Dissertations

Skeletal muscle is a dynamic tissue with tight developmental control and the ability to significantly remodel in the postnatal animal. Understanding the molecular mechanisms underlying skeletal muscle development and postnatal growth is critical to potential therapeutic manipulation. Janus kinase2 (JAK2) is a tyrosine kinase critical for growth of numerous cell types and is causative in many cancers, including leukemia. In this study we sought to understand the role of the JAK/STAT signaling cascade in skeletal muscle. In particular, this research focused on the role of JAK2 in skeletal muscle mitogenesis, myogenesis, and hypertrophy. Little work has been done regarding ...


Irradiation Processing Of Ready-To-Eat Meats, Wigberto Núñez Maisonet Jan 2005

Irradiation Processing Of Ready-To-Eat Meats, Wigberto Núñez Maisonet

Retrospective Theses and Dissertations

Commercially available ham and pork frankfurters were irradiated at 1.6 kGy and evaluated for color, lipid oxidation, odor, flavor and the production of volatiles over 8 weeks of storage. Corned beef, roast beef, beef frankfurters, chicken roll, chicken frankfurters, turkey roll, cured turkey roll and turkey frankfurters were manufactured at the Iowa State Meat Laboratory and irradiated at 1.6 kGy. These products were evaluated for color, odor, flavor, and volatile compounds. Hams were manufactured at the Iowa State Meat Laboratory to achieve three different pHs in the finished products. The hams were treated with 0.0 kGy, 1 ...


Mapping Quantitative Trait Loci For Economic Traits In Chickens , Joseph Paul Mcelroy Jan 2005

Mapping Quantitative Trait Loci For Economic Traits In Chickens , Joseph Paul Mcelroy

Retrospective Theses and Dissertations

Identification of genomic regions harboring genes affecting economic traits is the primary step for the improvement of agricultural species through marker-assisted selection. Many important traits are difficult and expensive to measure, and, thus, selection can be improved by selecting directly upon genomic regions affecting these traits (QTL). White meat percentage (WM%) and Marek's disease (MD) resistance are examples of important traits in commercial chickens. One objective of the research presented herein was to identify QTL affecting WM%, other growth-related traits, and MD resistance. Another objective was to compare statistical models for identifying these QTL. Phenotypes and genetic markers on ...


Dietary Functional Ingredients And Quality Of Irradiated Turkey Breast Meat , Haijie Yan Jan 2005

Dietary Functional Ingredients And Quality Of Irradiated Turkey Breast Meat , Haijie Yan

Retrospective Theses and Dissertations

Four hundreds and eighty male turkeys (12-week-old, raised on a corn-soybean basal diet) were randomly fed 8 experimental diets supplemented with none (Control, Con), 200 IU/kg vitamin E (VE), 0.3 ppm Se (Se), 2.5%CLA (CLA), 200 IU/kg vitamin E+0.3 ppm Se (VE+Se), 200 IU/kg vitamin E+2.5%CLA (VE+CLA), 2.5%CLA+0.3ppm Se (Se+CLA), or 200 IU/kg vitamin E+0.3ppm Se+2.5%CLA (VE+Se+CLA). At 15 week breast meat was sampled and irradiated.;Irradiation increased (p < 0.05) lipid oxidation and Hunter color a* value. Dietary Vitamin E, Se, CLA alone and their combinations decreased (p < 0.05) lipid oxidation in meat caused by both irradiation and storage. Production of off-odor in turkey breast meat caused by storage and ionizing irradiation was reduced by treatment VE+Se, VE+CLA, and VE+Se+CLA.;Treatment VE+Se, VE+CLA, Se+CLA, and VE+Se+CLA reduced lipid oxidation of cooked irradiated turkey breast meat samples by 24%, 29%, 26%, and 40%, respectively after 7 days of storage under aerobic conditions. Dietary vitamin E and Se decreased the internal color a* value of vacuum packaged irradiated meats at day 0 and 7. Treatments VE+Se, VE+CLA, and VE+Se+CLA reduced the difference in sulfur-containing compounds between irradiated and non-irradiated meat, aerobic packaging was more effective in reducing sulfur-containing compounds in irradiated meat than vacuum packaging. Therefore, dietary treatments plus packaging methods are effective in reducing the quality defects induced by irradiation.;Raw and cooked samples from 32 treatments, 8 dietary treatments *2 irradiation doses* 2 package (aerobic and vacuum), were tested by eight trained panelists for turkey aroma and irradiation off-aroma. Irradiation off-aroma in turkey breast was reduced significantly (p < 0.05) by treatments containing vitamin E. Meat samples from four dietary treatments containing CLA had higher turkey aroma scores while two treatments containing vitamin E (VE and VE+Se) had lower scores.;Consumer acceptance tests on five selected treatments showed that consumers disliked the aroma of irradiated raw meat. Consumer preferred the appearance of cooked irradiated meat to non-irradiated meat.


Effects Of Age And Plane Of Nutrition On Immune Responsiveness Of Neonatal Dairy Calves , Monica Ruth Foote Jan 2005

Effects Of Age And Plane Of Nutrition On Immune Responsiveness Of Neonatal Dairy Calves , Monica Ruth Foote

Retrospective Theses and Dissertations

The neonatal calf has a heightened susceptibility to infectious disease. Traditional calf-rearing programs limit nutrient intake from milk or milk replacer during the first few weeks of life to promote dry-feed intake and early weaning. Dramatic improvements in growth performance achieved by feeding increased amounts of milk replacer with more protein is hypothesized to be associated with enhanced immune function and an increased resistance of the calf to infectious disease. Objectives of this dissertation were to characterize more extensively immune responses of the neonatal calf and to determine if intensified nutrition enhances immune function of milk replacer-fed calves. T-cell subsets ...


Effect Of Irradiation And Antimicrobials On The Growth And Survival Of Listeria Monocytogenes And Quality Of Ready-To-Eat Turkey Meat Products, Meijun Zhu Jan 2004

Effect Of Irradiation And Antimicrobials On The Growth And Survival Of Listeria Monocytogenes And Quality Of Ready-To-Eat Turkey Meat Products, Meijun Zhu

Retrospective Theses and Dissertations

This dissertation investigated the effect of irradiation and antimicrobials on the quality and survival of L. monocytogenes, a significant safety concern, in RTE turkey meat products. Results showed that dietary vitamin E was effective in reducing the number of L. monocytogenes carried by live turkeys, a source of L. monocytogenes contamination in RTE products. Irradiation was very effective in eliminating L. monocytogenes in both turkey breast rolls and hams. However, irradiation also caused quality changes. A dose of 2.0 kGy irradiation produced significant off-odor, mainly sulfur-related odor/flavor, in vacuum-packaged RTE turkey ham and rolls. Thus, only low dose ...


Quality Characteristics Of Irradiated Ready-To-Eat Meats , Terry Andrew Houser Jan 2004

Quality Characteristics Of Irradiated Ready-To-Eat Meats , Terry Andrew Houser

Retrospective Theses and Dissertations

Sliced, ham and all-pork frankfurters were irradiated at 1.6 kGy and evaluated for color, lipid oxidation, odor, flavor, and the production of volatiles over an 8-week storage period. Irradiation processing did not affect color or lipid oxidation values for the ham or frankfurters. Irradiation processing increased off-odor scores for the ham but not for frankfurters. Off-flavor scores were not significantly different for ham but were higher in frankfurters due to irradiation processing. Dimethyl disulfide content increased as a result of irradiation in both products but decreased over the 8-week storage period.;Corned beef, roast beef, all-beef frankfurters, chicken roll ...


Fertility In Angus Females , Jennifer Arleen Minick Jan 2004

Fertility In Angus Females , Jennifer Arleen Minick

Retrospective Theses and Dissertations

Reproduction is economically important to the beef producer. The objective of this study was to determine if pregnancy rate, calving day (CD) and age at first calving (AFC) could be used to select for female fertility in Angus beef cattle. Producers from six herds in five states provided 3144 heifer records. A general linear animal model, using the relationship matrix, was fitted to the binary trait of pregnancy status by the software Matvec. The heritability of pregnancy percentage on the underlying scale was 0.13 +/- 0.07. Estimated breeding values, which are in units of underlying fertility, ranged from -0 ...


Relationships Of Dairy Herd Improvement Association Performance Measures To Profit Score In Dairy Herds , Michal Lunak Jan 2004

Relationships Of Dairy Herd Improvement Association Performance Measures To Profit Score In Dairy Herds , Michal Lunak

Retrospective Theses and Dissertations

The objectives of this research were to: (1) express variation in DHIA herd performance measures by means of limited number of factors, (2) determine the relationship of DHIA performance measures to profit score and their sensitivity to market price changes, (3) identify which herd performance measures changes were associated with profit score changes over five-year horizon.;For the variability in DHIA herd performance measures large variation among herds would indicate notable opportunity for changing management strategy. It was concluded that three independent factors offer the greatest opportunity for improvement within most production subsets. Notably, the reproductive measures of calving interval ...