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Full-Text Articles in Life Sciences

The Economics Of Milk Quality Management Practices And Milk Pricing In Simulated United States Dairy Herds, Derek Thomas Nolan Jan 2020

The Economics Of Milk Quality Management Practices And Milk Pricing In Simulated United States Dairy Herds, Derek Thomas Nolan

Theses and Dissertations--Animal and Food Sciences

Mastitis is considered one of the most common and costly diseases in the dairy industry. Intramammary infection status at a herd level is measured using somatic cell count (SCC). Understanding the total cost of an elevated somatic cell count can help influence dairy farmers to lower SCC and select management practices to produce higher quality milk. The first objective of our research was to determine if the cost of an elevated somatic cell count to farms can be decreased through the adoption of management practices with varying expenses. Using stochastic simulation modeling, the adoption of three differently priced management practices ...


Immunometabolic Profiling Of Cd4+ T Cells In Cattle, Jordan Marie Eder Jan 2019

Immunometabolic Profiling Of Cd4+ T Cells In Cattle, Jordan Marie Eder

Graduate Theses and Dissertations

Immunometabolism is a growing field and examines the effects cellular metabolism has on driving the immune response. T cell function is impacted by the changes in bioenergetics, as metabolism is intricately linked to activation signals intra- and extracellularly, nutrient acquisition, cell cycle progression and proliferation, and overall the induction of a productive effector response. This dissertation interrogates the role immunometabolism plays in CD4+ T cells from dairy cattle during the complete lactation cycle (early lactation to the dry period), as well as its role in the maturation of the CD4+ T cell response in the calf and how that compares ...


A Qualitative Research Approach To Understanding Challenges That May Inhibit Optimal Usage Of Automatic Milking Systems In Northern Utah, Jessica Christensen Dec 2018

A Qualitative Research Approach To Understanding Challenges That May Inhibit Optimal Usage Of Automatic Milking Systems In Northern Utah, Jessica Christensen

Undergraduate Honors Capstone Projects

Dairy robotics, i.e., Automatic Milking Systems (AMS), is a relatively new field, one that has great promise to optimize efficiency, production, and animal welfare of dairy cattle. However, despite quantitative research findings that indicate AMS success, dairy farmers still face challenges integrating AMS into their production systems. During the fall of 2018, interviews were conducted with northern Utah dairy farmers regarding their robotic systems. The respondent data was analyzed to reveal repeated problems with the robots. This analysis was then used to direct research in order to propose solutions to the farmers' AMS challenges. Conclusions were then summarized in ...


Comparing Dairy Farm Performance And Heat Stress Abatment Strategies In The United States Using Summer To Winter Ratios, Jenna M. Guinn Jan 2018

Comparing Dairy Farm Performance And Heat Stress Abatment Strategies In The United States Using Summer To Winter Ratios, Jenna M. Guinn

Theses and Dissertations--Animal and Food Sciences

Heat stress abatement is a challenge for producers in the United States, especially in the southern states. Dairy producers could benefit by having a simply metric to measure heat stress abatement strategies with the goal of motivating improvement in heat stress management. Managing heat stress is key to ameliorating the effects on dairy cow performance. A study was performed to explore the use of a heat stress metric called the Summer to Winter performance ratio (S:W ratio), to quantify and compare farm performance variables among regions of the United States. Summer to Winter ratios were closest to 1.0 ...


Impact Of Disease In Dairy Cows On Ceftiofur Pharmacokinetics, Withdrawal Times And Emergence Of Antimicrobial Resistance, Patrick John Gorden Jan 2017

Impact Of Disease In Dairy Cows On Ceftiofur Pharmacokinetics, Withdrawal Times And Emergence Of Antimicrobial Resistance, Patrick John Gorden

Graduate Theses and Dissertations

Producing safe and wholesome food is a priority of animal agriculture in order to maintain consumer confidence in the products produced by the animal agriculture industries. Antimicrobial residues and antimicrobial resistant organisms are two of the most important concerns of consumers regarding food safety. Withholding periods are in place to minimize the risk of antimicrobial residues being present in food. However, these withholding periods are established on healthy animals, not clinically ill animals. Additionally, there is no such withholding period in place to minimize the risk of transporting antimicrobial resistant organisms through food following treatment, although it has been proposed ...


The Effect Of Heat Stress And Essential Amino Acids On Production And Metabolism Of Lactating Dairy Cattle, Kimberly Rose Kassube Aug 2016

The Effect Of Heat Stress And Essential Amino Acids On Production And Metabolism Of Lactating Dairy Cattle, Kimberly Rose Kassube

Masters Theses

Heat stress (HS) causes decreases in production of lactating cattle that is only partially explained by decreases in intake. Evidence suggests that changes in energy and protein metabolism occur to cope with the impact of HS. The objective of this thesis was to determine if the effect of jugular infusion of essential amino acids (AA) ameliorated the negative effects of HS in milk production and metabolism. Twelve multiparous lactating Holstein cows were used in a crossover design to evaluate the effect of thermoneutral (THN) and HS environments along with the absence (CTL) or presence (ML+BCAA) of essential AA infusion ...


The Genetic Basis And Improvement Of Feed Efficiency In Lactating Holstein Dairy Cattle, Lydia Hardie Jan 2016

The Genetic Basis And Improvement Of Feed Efficiency In Lactating Holstein Dairy Cattle, Lydia Hardie

Graduate Theses and Dissertations

Improvement of feed utilization of the dairy cow through genetic selection may be a solution to increasing the environmental and economic sustainability of the dairy industry. Understanding the genetic basis of feed efficiency is imperative such that selection strategies can be optimized. The objective of this dissertation was to characterize the genetic architecture of feed efficiency, explore strategies for predicting genetic merit for feed efficiency, and consider the impact that selection for feed efficiency could have on related traits. Feed efficiency-related phenotypes and genotypes were collected on 4,916 cows from the United States, Canada, the Netherlands, and the United ...


Improving Feed Efficiency Through Forage Strategies For Increasing Dairy Profitability And Sustainability, Jon Patrick Pretz Jan 2016

Improving Feed Efficiency Through Forage Strategies For Increasing Dairy Profitability And Sustainability, Jon Patrick Pretz

Electronic Theses and Dissertations

Three studies were conducted to determine production parameters and study specific hypothesis in regard to improving feed efficiency through various forage utilization strategies with or without the inclusion of various supplemented products. The first study evaluated the supplementation of a cobalt-lactate product and its effects on fiber digestibility and milk production parameters when fed to cows consuming a 70% forage diet. Treatments included: 1) CONTROL diet containing 12.5 mg/cow/d of cobalt (carbonate carbonate) and 2) TEST diet being the same basal diet but including an additional 50 mg/cow/d of cobalt via a 1% Co-lactate product ...


Characterization Of Inter-Animal Variation In The Innate Immune Response Of The Bovine And Its Relation To S. Aureus Mastitis., Aimee Benjamin Jan 2016

Characterization Of Inter-Animal Variation In The Innate Immune Response Of The Bovine And Its Relation To S. Aureus Mastitis., Aimee Benjamin

Graduate College Dissertations and Theses

Mastitis represents one of the major economical and animal welfare concerns within the dairy industry. Animals affected with this disease can experience a range of clinical symptoms from mild discomfort and swelling of the udder to a severe systemic inflammatory response that could result in the death of the animal. This range of responses is due to differences in pathogen, environment, and inter-animal differences in their innate immune response. A dermal fibroblast model was used to predict the magnitude of an animal's innate immune response towards an intra-mammary S. aureus challenge. Animals whose fibroblasts exhibited a low response phenotype ...


Using Progesterone As An Indicator Of Ovarian Response To Stimulation In Cattle, Kayla Mariah Kauffman Mar 2014

Using Progesterone As An Indicator Of Ovarian Response To Stimulation In Cattle, Kayla Mariah Kauffman

Animal Science

No abstract provided.


Cystic Ovaries In Dairy Cattle, Lacey Morgan Rosenberg Dec 2010

Cystic Ovaries In Dairy Cattle, Lacey Morgan Rosenberg

Dairy Science

The objective of this literature review was to determine the potential causes and factors affecting the incidence of ovarian cysts in dairy cattle as well as to examine functionality of various preventative methods and treatments of cysts. The end product was to be a document outlining all the information available on the three different types of cysts that can develop on the bovine ovary, follicular cysts, luteal cysts, and cystic corpora lutea. The literature that was reviewed, most in the forms of research papers, articles, and reviews, came primarily from scientific journals and published books. The literature reviewed was only ...


Selecting, Marketing And Rebuilding A Herd Of Genetically Superior Animals, Katherine Rector Dec 2009

Selecting, Marketing And Rebuilding A Herd Of Genetically Superior Animals, Katherine Rector

Dairy Science

No abstract provided.


Viability Of Alternative Genetic Improvement Strategies Using Whole Genome Selection On Commercial Dairy Operations, Levi W.M. Gassaway Jun 2009

Viability Of Alternative Genetic Improvement Strategies Using Whole Genome Selection On Commercial Dairy Operations, Levi W.M. Gassaway

Master's Theses and Project Reports

The objective of this thesis was to determine the viability of alternative genetic improvement strategies (GIS). Each alternative GIS combined the use of whole genome selection (WGS) with common reproductive methods (non-sexed semen artificial insemination (AI), sexed semen AI, embryo transfer utilizing non-sexed semen AI) that can be found on a commercial dairy operation. The viability of each GIS was determined using a discounted gene flow model, designed with parameters of a typical western dairy operation, to evaluate the following variables: reproductive method, selection intensity, accuracy of prediction and female age-class. Of the GIS investigated, a heifer-based strategy that used ...


Effects Of Protein Sources With Differing Ruminal Degradation Characteristics On Nutrient Digestibilities And Flows Through Various Segments Of The Gastrointestinal Tract Of Non-Lactating Holstein Cows, Taylor Whitney Braud Jan 2005

Effects Of Protein Sources With Differing Ruminal Degradation Characteristics On Nutrient Digestibilities And Flows Through Various Segments Of The Gastrointestinal Tract Of Non-Lactating Holstein Cows, Taylor Whitney Braud

LSU Master's Theses

Six non-lactating Holstein cows with ruminal and duodenal cannulas were used in a replicated 3x3 Latin square design experiment to investigate the effects of supplemental protein source on ruminal and total tract nutrient digestibility. Supplemental protein was provided from soybean meal (SBM), expeller processed soybean meal (EXP), or menhaden fish meal (FM). Basal diets consisted of (DM basis) 33% corn silage, 20% bermudagrass hay, 27% ground corn, and 2% minerals and vitamins. Supplemental protein was provided as (DM % of total diet) 18% soybean meal (SOY), 17% soybean meal and 1% fish meal (FM), or 12% soybean meal and 6% expeller ...


The Feasibility Of Artificial Insemination Of Dairy Cattle Managed By Fulani Tribesmen In Kaduna State, Nigeria, Christian Olafimihan Ojomo May 1987

The Feasibility Of Artificial Insemination Of Dairy Cattle Managed By Fulani Tribesmen In Kaduna State, Nigeria, Christian Olafimihan Ojomo

All Graduate Theses and Dissertations

This study sought to determine: (a) the essential elements of a viable artificial insemination program for the Fulani Tribesmen in Kaduna State, Nigeria, and (b) to determine if the essential elements of a viable artificial insemination program exist in Kaduna State, Nigeria. This study was conducted from April 15 to May 15, 1985, in the Artificial Insemination (AI) Subcenters of Zaria, Katsina, Kabomo, Kaduna, Ikara, Zonkwa, Kurmin-Biri, and Kauranjuli. The data presented in this study were collected by personal interviews with Fulani Tribesmen. The population of this study was from a partial list of Fulani Tribesmen who have had AI ...


Estimation Of Genetic Trends And Effect Of Genetic Trends On Sire Evaluation , Rex Lynn Powell Jan 1972

Estimation Of Genetic Trends And Effect Of Genetic Trends On Sire Evaluation , Rex Lynn Powell

Retrospective Theses and Dissertations

No abstract provided.


Survivorship In Dairy Cows , Alexander Millar Meek Jan 1961

Survivorship In Dairy Cows , Alexander Millar Meek

Retrospective Theses and Dissertations

No abstract provided.