Etiology of Subclinical Bovine Mastitis In Biblian- Ecuador
Etiology of Subclinical Bovine Mastitis In Biblian- Ecuador
Mercy Cuenca-Condoy1*, Lourdes Reinoso-García2, Juan González-Rojas2, Dionel García-Bracho3
ABSTRACT
Mastitis is an inflammatory reaction of infectious, traumatic or toxic origin of the mammary gland tissue. It is a common pathology in dairy cows and of economic importance in the dairy industry worldwide. The objective of the study was to identify the microorganisms that cause subclinical bovine mastitis and their frequency in the Biblián-Ecuador canton. One thousand four hundred and forty mammary quarters were analyzed, coming from 360 Holstein cows in milk production. The California Mastitis Test (CMT) was used to qualitatively verify the increase in somatic cell count (SCC) in milk to indicate the presence of microorganisms causing bovine mastitis. Of the 1440 quarters studied, 175 were found positive by CMT, these were plated in duplicate and incubated at 37°C for 18 hours. The microorganisms were isolated and identified by MAL-DI-TOF. The analyses determined the presence of Staphylococcus aureus, Staphylococcus chromogenes, Staphylococcus haemolyticus, Staphylococcus xylosus, Staphylococcus epidermidis, Streptococcus uberis, Streptococcus agalactiae, Lactobacillus mali, Moraxella osloensis, Kocuria salsiccia, Bacillus weihenstephanensis, Corynebacterium xerosis, Macrococcus canis, Chryseobacterium bovis, Rothia endophytica, among others. However, Staphylococcus chromogenes, Lactobacillus mali and Staphylococcus aureus were the most frequent bacteria in cases of subclinical bovine mastitis, reaching 23.4, 10.9 and 9.5% presence, respectively; Likewise, it was found that S. chromogenes and L. mali are more frequent in mechanical milking systems; S. aureus and S. uberis are present in equal frequency in mechanical and manual milking; Acinetobacter iwoffi and Kocuria salsiccia were only recorded in mechanical milking of dairy herds in Biblián -Ecuador. The study results suggested to improve management and hygiene in dairy farms of study area.
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