Bovine mastitis in ruminants: what is it, causes, symptoms, prevention

Introduction

Bovine mastitis is a widespread and costly disease in dairy cows, characterized by inflammation of the mammary gland. It affects milk production and quality, animal health, and farm profitability. Early detection and proper management are vital to control this disease and maintain a healthy herd.

What is bovine mastitis?

Mastitis is inflammation of the udder tissue, usually caused by bacterial infection. It leads to swelling, redness, heat, and pain in the mammary gland. There are two main types:

• Clinical mastitis: visible symptoms such as swollen, painful udders and abnormal milk containing clots or pus.
• Subclinical mastitis: no visible symptoms but increased somatic cell counts (SCC) in milk and reduced milk yield.

Mastitis can be acute, with rapid onset and severe symptoms, or chronic, with ongoing but less obvious effects.

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Causes of mastitis

Bacterial infection is the primary cause. Common pathogens include Staphylococcus aureus, Streptococcus agalactiae, Escherichia coli, and Streptococcus uberis. These bacteria enter the udder through the teat canal, especially if damaged.

Mastitis is classified as:

• Contagious: spread during milking due to poor hygiene or milking practices.
• Environmental: caused by bacteria from bedding, soil, or manure.

Other risk factors include teat injuries, poor nutrition, stress, and unsanitary housing.

Symptoms

Early recognition is key:

• Clinical mastitis: swollen, hot, painful udder; abnormal milk; reduced milk yield; possible fever.
• Subclinical mastitis: no visible signs; detected by elevated SCC and gradual milk production drop.

Prevention and management

Effective prevention combines good hygiene and management:

• Milking hygiene: clean and disinfect teats before and after milking; maintain equipment.
• Proper milking technique: avoid over-milking; ensure complete milk removal.
• Environment: keep bedding clean and dry; reduce exposure to manure and mud.
• Monitoring: regular SCC testing to detect subclinical cases.
• Nutrition: balanced diet to support immunity and reduce stress.
• Treatment: early veterinary care with appropriate antibiotics or therapies.

Conclusion

Bovine mastitis significantly impacts dairy farming by reducing milk quality and animal welfare. Understanding its causes, symptoms, and prevention is essential. Maintaining strict hygiene, proper nutrition, and regular monitoring helps reduce mastitis incidence, ensuring healthier cows and better milk production, ultimately benefiting farm profitability.