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Full-Text Articles in Animal Sciences
Identifying Mechanisms Associated With Innate Immunity In Cows Genetically Susceptible To Mastitis, Alexandra Alida Elliott
Identifying Mechanisms Associated With Innate Immunity In Cows Genetically Susceptible To Mastitis, Alexandra Alida Elliott
Doctoral Dissertations
Mastitis, or mammary gland inflammation, causes the greatest loss in profit for dairy producers. Mastitis susceptibility differs among cows due to environmental, physiological, and genetic factors. Prior research identified a genetic marker in a chemokine receptor, CXCR1, associated with mastitis susceptibility and decreased neutrophil migration. Current research seeks to identify reasons behind mastitis susceptibility by validating this model through in vivo challenge with Streptococcus uberis and studying specific mechanisms causing impaired neutrophil migration. Holstein cows with GG (n=19), GC (n=28), and CC (n=20) genotypes at CXCR1+777 were challenged intramammarily with S. uberis strain UT888. After challenge 68% of quarters from …
The Challenges Of Making A Blastocyst-Stage Embryo: Impact Of Heat Stress & Technical Factors Associated With Ivp Procedures, Estanislao Peixoto
The Challenges Of Making A Blastocyst-Stage Embryo: Impact Of Heat Stress & Technical Factors Associated With Ivp Procedures, Estanislao Peixoto
Masters Theses
It was hypothesized that technical factors associated with in vitro production (IVP) of embryos may influence rate of blastocyst development of oocytes matured at 38.5 or 41.0 C. To test this hypothesis, a retrospective meta-analysis was performed. Simple linear regression was performed to analyze continuous variables and ANOVA for categorical variables. Interactions among factors and maturation temperature on blastocyst development were analyzed using dummy regression for continuous variables, and using a factorial treatment design and ANOVA for categorical variables. Month of collection was the only variable that impacted responsiveness of ova to heat stress. Independent of maturation temperature, variables that …
W156-Clinical Mastitis Evaluation, The University Of Tennessee Agricultural Extension Service
W156-Clinical Mastitis Evaluation, The University Of Tennessee Agricultural Extension Service
Animals/Livestock
No abstract provided.
W155-Clinical Mastitis And Treatment Record By Time Period, The University Of Tennessee Agricultural Extension Service
W155-Clinical Mastitis And Treatment Record By Time Period, The University Of Tennessee Agricultural Extension Service
Animals/Livestock
No abstract provided.
W154-Clinical Mastitis And Treatment Record By Cow, The University Of Tennessee Agricultural Extension Service
W154-Clinical Mastitis And Treatment Record By Cow, The University Of Tennessee Agricultural Extension Service
Animals/Livestock
No abstract provided.
W153-Forms Of Mastitis, The University Of Tennessee Agricultural Extension Service
W153-Forms Of Mastitis, The University Of Tennessee Agricultural Extension Service
Animals/Livestock
No abstract provided.
W152-Estimating Losses Using Somatic Cell Counts, The University Of Tennessee Agricultural Extension Service
W152-Estimating Losses Using Somatic Cell Counts, The University Of Tennessee Agricultural Extension Service
Animals/Livestock
No abstract provided.
W151-Bulk Tank Milk Quality Parameters, The University Of Tennessee Agricultural Extension Service
W151-Bulk Tank Milk Quality Parameters, The University Of Tennessee Agricultural Extension Service
Animals/Livestock
Bacteria in milk, whether originating from the cow or from the environment, significantly impact the quality of dairy products and therefore consumer acceptance. Bacteria produce heatstable enzymes that can damage milk fat and milk protein. These enzymes are not affected by pasteurization and continue to cause damage in the final dairy product. High bacteria levels in raw milk result in off-flavors, bitter flavors, rancidity and reduced shelf life. The Pasteurized Milk Ordinance specifies safety standards of Grade A milk to protect public health, not to maximize product quality and shelf life. The PMO only sets limits on somatic cell count …
W150-Using Milk Somatic Cell Count Information, The University Of Tennessee Agricultural Extension Service
W150-Using Milk Somatic Cell Count Information, The University Of Tennessee Agricultural Extension Service
Animals/Livestock
The level of mastitis infection in a dairy herd can have a significant impact on herd profitability. Losses due to mastitis include decreased milk production, increased treatment costs, discarded milk, premature culling, death, decreased genetic potential, decreased reproductive performance, load rejection due to violation of somatic cell counts (SCC) or antibiotic residues and loss of milk quality premiums (3, 9, 12). Most producers easily relate clinical mastitis with these losses. However, subclinical (or hidden) mastitis may actually cause more losses in a herd than clinical mastitis. Since the animal does not exhibit typical symptoms of the disease, the problem is …
W149-Bulk Tank Milk Quality, The University Of Tennessee Agricultural Extension Service
W149-Bulk Tank Milk Quality, The University Of Tennessee Agricultural Extension Service
Animals/Livestock
Who is responsible for the safety and quality of dairy products? Dairy producers? Processors? Retailers? Consumers? In fact, all of these parties – from farm to fork – share in this responsibility. What starts as a high-quality product on the farm can be ruined somewhere along this chain. However, a poor-quality, inferior raw product leaving the farm cannot be transformed into a safe and high-quality product for the consumer. Despite technical advances in milk processing, the safety and quality of dairy products is still determined on the farm. Pasteurization does provide a certain level of safety, but is not the …
W148-Milk Quality And The Tennessee Quality Milk Initiative, The University Of Tennessee Agricultural Extension Service
W148-Milk Quality And The Tennessee Quality Milk Initiative, The University Of Tennessee Agricultural Extension Service
Animals/Livestock
According to records, in 1995, there were more than 1300 dairy farms in Tennessee. In 2007, the number declined to fewer than 600 dairies (9). There are several reasons for this mass exodus from the dairy industry in Tennessee: low milk prices, shortages of qualified labor, high feed costs, high fertilizer costs, high fuel costs, etc. In addition, many dairy producers in Tennessee and in the Southern Region are at risk of losing their milk market due to below average milk quality. Milk quality continues to be a topic of intense debate in the dairy industry. Dairy producers in the …