Isolation of bacteria from goat milk with high somatic cell counts
Keywords:
infections, mastitis, Staphylococcus, antibiogramAbstract
Infections caused by bacteria are a serious problem in goat milk production, causing diseases such as mastitis, so the objective is to determine which are the main bacteria that affect the goats of the Apaseo el Grande and their relationships with the somatic cell count. The milk samples were taken in Apaseo el Grande, Guanajuato, Mexico, from a flock of 300 goats, 15 goats with signs of mastitis were selected, the samples were transported to the Veterinary Medicine and Animal Husbandry Laboratory of the University of Guanajuato, during the months of August 2011 to June 2012. For the bacteriological analysis, the California Mastitis Test, the Colony Forming Unit Count, the Catalase Test and Gram Stain, the selective media Chromagar, Baird Parker Agar and Blood Agar and antimicrobial susceptibility tests on Mueller-Hinton agar were performed. In total, 9 samples had growth and the most frequently found bacteria in the isolates was Staphylococcus aureus and, less frequently, Staphylococcus saprophyticus and Bacillus cereus. In the antibiogram, it was observed that several samples were resistant to one of the antibiotics. The main pathogen present in the milk was Staphylococcus aureus, and it is related to the somatic cell count.
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