Mastitis in dairy cows
What is Mastitis in dairy cows
This disease simply means inflammation of the breast tissue
This disease leads to a decrease in the beneficial compounds of milk and an increase in the amount of unsuitable elements in milk. In general, it reduces the acceptable ingredients of milk and reduces the value of milk
This disease is very common and highly prevalent in lactating cows. Which causes a lot of economic losses. It is defined as an inflammatory reaction of the breast tissue parenchyma.
Causes of the disease
Mastitis can be caused by several factors including
- Infectious agents,
- Non-observance of hygienic points during milking and
- Toxic agents are created.
The disease is characterized by physical, chemical, and bacteriological changes in milk and changes in breast tissue.
Symptoms of the disease
- Clinical symptoms
- Swelling of breast tissue
- Painful to the touch
- Fever and depression
The role of viruses in the etiology of Mastitis
So far, 11 virus samples have been isolated from samples of cow’s milk with mastitis
- Herpes virus 1 and 4 bovine,
- Foot-and-Mouth Disease virus
- Parainfluenza 3 virus
- Gaussian leukemia virus
- Herpes virus 2 bovine,
- False bovine smallpox,
- Vesicular stomatitis,
- Snow fever virus
- Bovine papillomavirus
Mastitis Reproduction of herpes virus 1 bovine or parainfluenza 3 inside bovine mammary glands causes mastitis;
Breast gland necrosis This is while the intracranial proliferation of bovine snow fever virus leads to mammary gland necrosis.
Lesions in the breast tissue and mammary ducts
Bovine herpesvirus 2, vaccine, smallpox, bovine smallpox, vesicular stomatitis, foot-and-mouth disease virus and bovine papillomavirus indirectly play a role in the etiology of the disease. These viruses can cause lesions in the breast tissue and ducts, as well as weakening the natural defense mechanism of the breast tissue, which indirectly predisposes the breast to bacterial mastitis
Bovine herpesvirus 1, Gaussian viral diarrhea, bovine immunodeficiency virus, bovine leukemia virus may also be involved in indirect mastitis by weakening the immune system, but more research is needed to determine the indirect role of these factors in It is necessary to create this disease.
Gaussian leukemia virus has been isolated from the breast tissue of cows with subclinical mastitis, but the role and ability of the virus in causing the disease has not yet been reported.
Discussion and conclusion
Viral infections can play a direct or indirect role in the etiology of bovine mastitis. The importance of viral agents in the etiology of the disease and the economic damage requires more and more detailed studies.
Table 1- 1 The effect of mastitis on milk composition
|Optimal||Milk compounds||Impact of subclinical mastitis|
|Total protein||Slightly reduced|
|Casein||It is reduced by 6 to 20%|
|Lactose||It is reduced by 5 to 20%|
|Non-fat solids||Reduced to 8%|
|Milk fat||It is reduced by 4 to 12%|
|Shelf life and quality of milk||Is reduced|
|Taste||Due to the spoilage of milk, it tastes bitter and bad|
|Yogurt starter (yeast)||Is inhibited|
|Undesirable||Plasmin (Casein Decomposer)||increase|
|Lipase (fat breaker)||increase|
|Sodium||اincrease- Therefore, bitter milk tastes|