Pathology of bacterial mastitis in bovines
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Date
1998
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Centre of Excellence in Pathology, College of Veterinary and Animal Sciences, Mannuthy
Abstract
The pathology of bacterial mastitis in bovines was studied considering
the following aspects such as bacterial isolation; changes in milk, antibiotic
sensitivity pattern, haematology, whey protein pattern and histopathological
examination of the mammary gland and supramammary Iymphnodes.
Two hundred and sixty two samples were found to be subclinically
positive based on California Mastitis Test. The organisms isolated from
clinical and subclinical cases were Staphylococcus, E. Coli, Gram negative
bacilli, mixed infections, Streptococcus, Yeast and Gram positive bacilli in
the decreasing order of prevalence. All the major pathogens were sensitive
to pefloxacin, gentamycin and chloramphenicol and resistant to penicillin.
Leucopenia could be noticed in clinical and subclinical cases of
mastitis. Relative neutrophilia could be observed in mastitic animals. Total
plasma protein was also increased. There was an increase in T-Iymphocyte
count in mastitis affected animals.
~omatic cell count was increased in clinical and subclinical cases, but
was not indicative of infection, unless confirmed by bacteriological
examination.
SOS-PAGE on whey proteins revealed an increase in protein content
in mastitic milk as a result of the plasma proteins, cellular proteins, bacterial
proteins. There was marked increase in immunoglobulins in mastitic milk,
when compared to normal.
Histopathology of mammary glands revealed the presence of
inflammatory cells in the acini and interstitium of mammary glands as the
main lesion. Varying degrees of inflammatory reaction could be noticed in
almost all the quarters. Supra mammary lymph nodes revealed distension of
subcapsular sinuses, active secondary follicles in the cortex, sinus catarrh
and medullary hyperplasia in mastitis affected animals.
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Citation
171432