Study of risk factors for mastitis in dairy cattle in the Pontrieux region (France) and their relationship with isolated bacterial agents (2016 to 2022)

Villiers-Moriamé, Claire Marine Mauricette

http://hdl.handle.net/10400.26/51188

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Authors

Villiers-Moriamé, Claire Marine Mauricette

Advisor(s)

Francisco, Anabela Maduro de Almeida

Abstract(s)

Today, mastitis is one of the most detrimental diseases in dairy farming. It not only re- duces the quantity but also the quality of milk. Milk production is expensive, costing 490€ per 1,000 liters. Poor-quality milk is equally expensive to produce, if not more, due to the costs associated with treatments, primarily antibiotics, replacing dead animals, destruction of infected milk produc- tion, etc. In this study, milk samples collected by farmers or veterinarians from cows with suspected mastitis were analysed to identify the bacteria involved, as well as the living conditions and indi- vidual characteristics of the affected cows. This study aims to describe the etiological agents respon- sible for mastitis in the Pontrieux region (Côtes d'Armor, France) between 2016 and 2022 and to investigate the occurrence proportion of mastitis with the productionenvironmental-level (e.g., management practices, milking system) and climatological-level factors.. The results highlighted Streptococcus uberis (28.31%) and Escherichia coli (6.34%) as the “all year” ethiological agents, which are present throughout the year which may be related to the specific climate of the Pontrieux region. Others show seasonality, such as non uberis (9.29%), which is less frequent during the win- ter months, or Staphylococcus aureus (11.58%) and Staphylococcus non aureus (15.96%), which pre- fer milder seasons like spring. , this study also presents the proportion of mastitis associated with certain milking and bedding practices. Therefore, it is important to consider these environmental factors in order to prevent mastitis and reduce their numbers and impact on the dairy industry.