Abstract
This study evaluated the efficiency of ozonated water compared with chlorhexidine to disinfect teats of cattle and their influence on milk quality. 48 cows were separated in 2 groups of sanitation: (I) using ozonated water at 2 mg.L -1 for 30s and (II) using 2%(v/v) chlorhexidine for 30s (standard methodology of disinfection). Before and after sanitation, swabs of teat were collected for carry out microbiological analysis. Additionally, after teats sanitation, the milking was performed and the obtained milk were evaluated by microbiological and physico-chemical parameters. The number of decimal reductions (NDR) reached after ozone sanitation was 2.52, 2.09 and 1.50 for aerobic mesophilic, Staphylococcus sp. and Enterobacteriaceae, respectively. The use of chlorhexidine promoted NRD of 2.38 (aerobic mesophilic), 2.04 ( Staphylococcus sp.) and 1.16 (Enterobacteriaceae). Therefore, no significant differences were found between NRD caused by chlorhexidine and ozonated water. Moreover, no significant differences were observed in the psychrotrophic and aerobic mesophilic counts of the milk obtained after teats sanitation with ozonated water and chlorhexidine. Furthermore, it was observed that only samples obtained from cows treated with chlorhexidine showed the presence of Enterobacteriaceae. There were no changes in the physico-chemical parameters of milk obtained after both treatments. Thus, the ozonated water is a potential substitute of chlorhexidine for cows teats sanitation, resulting in similar microbiological reductions without risks of bacterial resistance development and waste generation.
Highlights
É crescente a demanda por novas alternativas de redução de contaminantes em alimentos, especialmente aquelas com processos seguros em termos de toxicidade e que mantenham o alimento com características similares ao produto in natura
O ozônio pode ser utilizado na forma gasosa por borbulhamento do gás em líquidos ou contato do gás com superfícies a ser desinfetadas
Os resultados obtidos nas contagens iniciais foram compatíveis com os esperados para animais sadios e com manejo adequado (Tabela 1)
Summary
A contaminação bacteriana do leite cru pode ocorrer a partir do próprio animal, do homem e do ambiente. Como correta higienização dos tetos e das ordenhadeiras, devem ser tomadas durante o processo de ordenha com a nalidade de diminuir o número de micro-organismos que podem ser transferidos ao leite (AMARAL et al, 2004). O ozônio molecular e seus produtos de decomposição inativam micro-organismos rapidamente pela oxidação de elementos celulares vitais (enzimas intracelulares, ácidos nucléicos e membranas), e pode ter ação aditiva ou sinérgica com outros métodos de desinfecção (KIM et al, 1999b). Considerando os dados previamente relatados na literatura e a potencial utilização do ozônio como sani cante, esse trabalho avaliou a e ciência da água ozonizada em comparação com a clorexidina na desinfecção de tetos dos bovinos e sua in uência na qualidade do leite
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