Mastitis in dairy cows thesis

Objectives of the study were to document the impact of some management factors on the occurrence of clinical mastitis in primiparous dairy cows and to identify common udder pathogens of clinical mastitis in freshly calved heifers and multiparous cows on the day of calving. A one-year study was conducted during and in 11 selected Estonian dairy herds. Data consisted of 68 heifers with clinical mastitis and heifers without clinical mastitis on the day of calving. Multivariable logistic regression with a random herd effect was used to investigate any association between housing system or the time interval from movement of heifers to the calving facility and day of calving on occurrence of clinical mastitis.
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Mastitis in Cows: Causes, Types, Treatment, Prevention and Control

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Keeping cows healthy minimizes the need for therapeutic interventions which can reduce use of antibiotics, reduce the cost of producing milk, decrease food waste, and contribute to a continued supply of safe, wholesome milk for consumers. The contemporary Holstein cow has a less robust immune system and is more susceptible to disease and metabolic disorders than her ancestors 2 due in part, to a reduced prevalence of genetic polymorphisms that support a strong immune response and an increased prevalence of detrimental polymorphisms 3,4. We will use unselected Holsteins that represent the ancestors of contemporary Holsteins to identify polymorphisms that contribute to a robust immune system. Prevalence of beneficial and detrimental polymorphisms in the DNA of contemporary Holsteins will be determined and the information used to identify polymorphisms to be included in gene-assisted selection strategies designed to strengthen immune function and increase mastitis resistance. Our premise is that previous selection practices have successfully increased the presence of genetic polymorphisms associated with increased milk yield but have decreased the presences of polymorphisms associated with disease resistance. Our overall goal is to increase the presence of polymorphisms in the Holstein cow to strengthen immune function and increase mastitis resistance.
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Mastitis in dairy cattle

The dairy industry in New Zealand, Australia and some other parts of the world is pasture-based and seasonal. This practice has created an irregular supply of milk to processors in terms of both volume and quality. The manufacturers of dairy products, sourcing milk from pasture-based dairying systems, are challenged by the increasing demand to produce high-quality dairy products from a milk supply that is inconsistent in its processing characteristics across the season. Factors contributing to variations in milk composition, and therefore product quality, include the stage of lactation of the cows, breed, plane of nutrition, seasonal factors and pathological changes associated with mastitis [1, 2].
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The objective of the study was to estimate the losses associated with subclinical mastitis SCM in crossbred dairy cows in the Central Highlands of Ethiopia. A split udder investigation was performed with 30 cows to determine production losses associated with SCM. Each quarter of the study cows was examined using the California Mastitis Test CMT and quarter milk production was measured over a period of 8 days. Production losses were determined for different CMT scores by comparing production of quarters with CMT score 0 to quarters with CMT scores trace, 1, 2 and 3, respectively.
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