Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"clinical mastitis"”.
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The use of animal activity data and milk components as indicators of clinical mastitis
… and milk components can be used to detect mastitis prior to clinical onset. Data from 268 cases with clinical mastitis and respective controls (n=268) from Virginia Tech and the University of Florida dairy herds were examined. Variables collected included daily milk yield, electrical …
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On-farm strategies for the prevention and detection of Gram-specific clinical mastitis in dairy cows
Controlling mastitis in dairy herds relies on good prevention and detection methods. This dissertation describes two areas of research relating to mastitis control. In the first objective, the efficacy of 2 vaccines against Escherichia coli mastitis in mid-lactation dairy cows was evaluated. …
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Impact of sire PTA<SUB>SCS</SUB> on mastitis resistance and measures of daughter performance
… the impact of PTA<SUB>SCS</SUB> on incidence of mastitis, daughter response to infection, and other measures of daughter performance was conducted using data on 1st, 2nd, and 3rd lactation Holsteins obtained from the Virginia Tech herd and from VA DHI herds. Overall correlation of …
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Effects of Outdoor Access and Season on Mastitis Pathogen Distribution and Milk Quality Parameters in Dairy Herds in Western Canada
… whether outdoor access increases the risk of clinical mastitis, particularly from environmental pathogens. However, little research has compared mastitis pathogen distribution across different housing systems in Alberta (AB) and British Columbia (BC). This thesis characterises mastitis …
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Abundance of Antibiotic Resistance Genes in Feces Following Prophylactic and Therapeutic Intramammary Antibiotic Infusion in Dairy Cattle
… administered therapeutically during a clinical mastitis infection on the abundance and relative abundance of ARGs in dairy cow feces. For prophylactic treatment using cephapirin benzathine, nineteen end-of-lactation cows were used. Treatment cows (n = 9) received cephapirin benzathine …
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The use of activity measures in combination with physiological factors as indicators of disease in dairy cattle
… during experimentally induced Escherichia coli mastitis. A total of 24 primiparous and multiparous lactating dairy cows were challenged with E.coli 727 in one quarter. Of the 24 E.coli challenged animals, 12 were administered FM at 0.002 µg/45.5kg of body weight at the onset of clinical …
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Implications of the ability of Enterococcus spp. to survive the ensiling process and bovine gastrointestinal tract on the risk of bovine mastitis
… tract could impact risk of bovine mastitis. The first study determined ability of enterococci to survive 3 wk ensiling. Grass and corn crops were divided into 3 treatments: 2 commercial silage inoculants, 1 negative control. After wk 1, 2, and 3 of ensiling, dry matter and bacterial …
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Investigation of the presence and activity of the innate immune component, Complement, in bovine milk
… a higher somatic cell counts (SCC). Inducing sub-clinical mastitis in the healthy quarter of a lactating cow confirmed that increased Complement activity effect was local to the affected quarter and not manifested systemically. Complement activity levels varied in the milks of 7 commercially …
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Big data and machine learning tools to understand mastitis epidemiology and other topics
… 3) a model was developed for the detection of clinical mastitis (CM) based on routinely collected data from automated milking systems (AMS); 4) a simulation study assessed the impact of unmeasured heterogeneity in secondary data collected from multiple dairy farms on the performance of a model …
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Subclinical mastitis in relation to solids-not-fat content of cow's milk
… the undesirable effects of the “hidden” form of mastitis on production of high quality liquid milk. The “visible” form of mastitis has been known to lower milk yield and quality. With the discovery of Penicillin, and subsequently other antibiotics, clinical mastitis has become less of a threat to …
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Duration of Antibiotic Residues in Milk from Cows Treated via Intrauterine and Intramammary Infusion
… most common of these diseases in dairy cows is mastitis. Mastitis is defined by the National Mastitis Council (NMC) (49) as an inflammation of the mammary gland. It is the most prevalent and most costly disease .of dairy cattle. It is estimated that at least 50% of all cows are infected with …
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Using Data Analytics in Agriculture to Make Better Management Decisions
… research, models were used to predict cases of clinical mastitis (CM) in dairy cows. Machine learning models took daily inputs relating to activity and production to produce probabilities of CM. By considering the economic costs of treatment and non-treatment in CM cases, we provide insight into …
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Dye Marking of Antibiotics Used in Treatment of Mastitis
<p>The National Mastitis Council, Inc. defines mastitis as the infection of udder tissues (74). Mastitis is the most costly disease affecting dairy cows; many people do not realize the considerable losses due to mastitis (6). A reasonable estimate of the prevalence of mastitis is 50% of cows …
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Dairy cow management systems: handling, health, and well-being
… body temperature from normal include metritis, mastitis, some causes of lameness, and pneumonia. The objective of the study was to investigate associations between increases in core body temperature in cows and the diagnosis of metritis, mastitis, lameness, and pneumonia by dairy personnel. A …
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Inflamatory status and leukocyte function during the peripartum period and subsequent effects on reproduction and lactational performance in dairy cattle
… well as, infectious diseases like metritis and mastitis. Early detection could be beneficial in reducing the severity of disease outcomes and monitoring blood metabolites can be useful in the identification of at-risk animals prior to the exhibition of clinical symptoms, possibly leading to a …
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Development of an advanced deep learning and neural network method for automatic early detection of mastitis in dairy cattle : A thesis submitted in partial fulfilment of the requirements for the Degree of Doctor of Philosophy at Lincoln University
Mastitis, a costly and prevalent disease in dairy cows, reduces milk yield, quality, and animal welfare, while increasing treatment costs. Early detection, especially in the subclinical stage, is crucial for controlling the disease and maintaining milk production. This study explores advanced …