Prevalência e etiologia de mastite bovina subclínica em propriedades do estado de Goiás que utilizam ordenhadeiras na obtenção do leite

Abstract

Samples from 942 cows were tested bythe California Mastitis Test-CMT. Most of them were black and white holstein, apparently healthy animais, from 25' dairyfanns, located in the State of Goiás, ÍlJ. which milking process was made mechanically. It was fonnd that 375 (3 9 ,8%) animais showed positive results to CMT in values ranging.from +, ++, +++. Milk from each CMT reactive teat, 667 samples in total, was bacteriologically analised in attempt to isolate and identify microorganisms associated withintramammarianinfections, obtaining 938 strainsin pure cultnre orinassociation, as follows: Staphylococcus aureus, 291 times (30,2%); Corynebacterium bovis, 120 times (12,5%); coagulase negative Staphylococcus, 112 times (11,6%); Streplococcu., aga/actiae, 14 times (1,5%); Streptococcus uberis, 36 times (3,7%); Streptococcus pyogenes, 12 times (1,2%); Streplococcusspp, 66 times (6,9%); Pseudomonasspp., 96 times (l O, 0%); Corynebacterium pyogenes, 24 times (2,5%); Escherichia coli, 60times (6,2%); Nocardia spp.p.. 14 times (1,5%) and others, 93 times (9,6%). These microorganisms were considered as being either primarily pathogens (55,8%) or contaminants (41,6%).