TRADITIONAL METHODS OF DIAGNOSING INFECTIOUS MASTITIS IN CATTLE

Infectious mastitis of cattle is the most common disease of dairy cattle, which causes significant economic losses due to reduced milk yield and poor milk quality. Etiological agents include a variety of gram-positive and gram-negative bacteria. In the winter or off-season, the main factor in the occurrence of mastitis is the contamination of the mammary gland with pathogenic microflora against the background of hypothermia. Infectious mastitis, as a rule, has a long subclinical form of manifestation and is characterized by the absence of clinical signs against the background of a high level of somatic cells. The occurrence of mastitis is facilitated by the development of pathogenic microorganisms. Due to the qualitative analysis of indicators of milk microflora, the main microorganisms that cause infectious mastitis were identified as S. epidermidis, S. aureus. S. uberis. During bacteriological studies, pure cultures of staphylococci, streptococci, and enterobacteria were isolated on selective and differential diagnostic media. In milk samples from patients with subclinical mastitis, representatives of the morphological group of fungi and mycoplasma were not isolated. The antibiotic sensitivity of the microflora in the milk samples of sick animals to gentamicin and amoxicillin and the false bactericidal effect to streptomycin, cefazolin, doxycycline and tetracycline, as well as the lack of sensitivity to penicillin, were established.