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Theses/Dissertations

2013

Graduate Theses and Dissertations

Animal Sciences

Swine

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Genetic And Phenotypic Relationships Between Feed Intake During Lactation And Reproductive Performance, Chad Lewis Yoder Jan 2013

Genetic And Phenotypic Relationships Between Feed Intake During Lactation And Reproductive Performance, Chad Lewis Yoder

Graduate Theses and Dissertations

Daily feed intake during lactation was recorded on purebred Yorkshire (n = 1587), Landrace (n = 2197), and F1 Yorkshire x Landrace (n = 6932) litters from day 1 to 22 of lactation. Lactation feed intake (LFI) curves were predicted using a mixed model which included fixed effects of breed, season, parity group (PG), day of lactation, interactions of day with breed and PG, and a covariate for litter size after cross–fostering. Random effects included litter, contemporary group (herd–year–month), dam, and sire nested within breed. Least squares means for each day were used to define LFI curves by breed through ...


The Genetic Basis Of Host Response To Experimental Infection With The Porcine Reproductive And Respiratory Syndrome Virus In Pigs, Nicholas James Boddicker Jan 2013

The Genetic Basis Of Host Response To Experimental Infection With The Porcine Reproductive And Respiratory Syndrome Virus In Pigs, Nicholas James Boddicker

Graduate Theses and Dissertations

Porcine reproductive and respiratory syndrome (PRRS) is the most economically important disease in the swine industry. The effects of PRRS are two fold in that it causes reproductive problems in breeding females and respiratory problems in growing animals. Vaccination has generally not been effective in the prevention of PRRS, partially due to the rapid mutation rate and evolution of the virus. The overall objective of this thesis was to discover the genetic basis of host response to PRRS virus (PRRSV) using data from the PRRS Host Genetics Consortium PRRS-CAP project by conducting genome-wide association analyses and estimating genetic parameters. Eight ...


Characterizing The Porcine Immune Response To An Environmental And Pathogenic Challenge: Swine Barn Dust And Salmonella Infection, Susan Knetter Jan 2013

Characterizing The Porcine Immune Response To An Environmental And Pathogenic Challenge: Swine Barn Dust And Salmonella Infection, Susan Knetter

Graduate Theses and Dissertations

Pork is the most highly consumed meat worldwide, and the swine industry generates $34.5 billion annually to the U.S. economy alone. Maintaining pork safety and minimizing production losses associated with swine disease impacts profitability, food safety and animal health. As such, the research presented herein focused on characterizing aspects of the porcine immune response to two challenges that impact swine health: swine barn dust exposure and Salmonella infection.

In the first set of experiments, swine barn organic dust extract (ODE) treatment negatively affected porcine macrophage phagocytosis, intracellular bacterial killing and NF-kB translocation. Further, ODE stimulated production of inflammatory ...


Effects Of Flow Rate, Gas Type And Disease Status On The Welfare Of Sucking And Weaned Pigs During Gas Euthanasia, Larry Joseph Sadler Jan 2013

Effects Of Flow Rate, Gas Type And Disease Status On The Welfare Of Sucking And Weaned Pigs During Gas Euthanasia, Larry Joseph Sadler

Graduate Theses and Dissertations

Gas euthanasia of swine on farms is increasingly common. However, there is controversy regarding pig welfare during gas euthanasia and research must be conducted to establish best practices ensuring minimal pain and distress. The objectives of these studies were to determine pig welfare and efficacy of processes with various gas euthanasia procedures: gas type (carbon dioxide, argon, carbon dioxide:argon mixture), flow rate (20%, 35%, 50%, prefill), age (neonate, weaned) and disease status of the pig (respiratory disease/depression vs. other reasons). Euthanasia with inhalant gases can produce confounding effects on physiologic responses, therefore behavior was chosen as the primary ...


The Use Of Selection To Improve Sow Longevity, Caitlyn Elizabeth Abell Jan 2013

The Use Of Selection To Improve Sow Longevity, Caitlyn Elizabeth Abell

Graduate Theses and Dissertations

The objective of this dissertation was to evaluate multiple approaches to incorporating sow longevity or lifetime sow productivity into a selection program. Sow longevity can be selected for using indicator traits, such as structural soundness and lameness. In the first study, objective measurements to detect sow lameness were examined. Lameness was chemically induced for a short time period in multiparous sows and their weight distribution and walking gait were objectively measured in the days following lameness induction. Using a classification tree analysis, it was determined that the mean weight being placed on each leg was the most predictive measurement when ...