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Abstract
The influence of dirtiness and hyperkeratosis teat in the occurrence of subclinical mastitis was evaluated in cattle of Oliveira (MG) with 70 dairy cows in the summer and 77 in winter, 2012. The teats were classified through the hyperkeratosis degree and dirtiness level according to methods described in the literature. The detection of animals with mastitis was performed by California Mastitis Test. The prevalence teats with mastitis, hyperkeratosis and dirty were 37.6, 87.9 and 71.4% in summer, respectively. In winter, the prevalences were 39.6, 73.2 and 68.8%, respectively. Teats with hyperkeratosis have 8.3 times the risk of having mastitis that healthy teats (p0.05) the occurrence of subclinical mastitis. The maintenance of milking machine should be performed in cattle with a high prevalence of hyperkeratosis teat. The sources of dirt on cows teats should be detected in free-stall system.
Highlights
Dentre as atividades agropecuárias exercidas no Brasil, a pecuária leiteira possui expressiva importância para a economia do país, contribuindo para a elevação do Produto Interno Bruto (PIB)
O grau de sujidade dos tetos não aumenta o risco de mastite subclínica, mas as fontes de sujeiras em tetos de vacas devem ser detectadas no sistema free-stall
Summary
Dentre as atividades agropecuárias exercidas no Brasil, a pecuária leiteira possui expressiva importância para a economia do país, contribuindo para a elevação do Produto Interno Bruto (PIB). Além de não permitir o fechamento do esfíncter do teto, a hiperqueratose permite os micro-organismos se alojarem no local, o que se torna reservatório para agentes causadores de mastite (Hillerton et al, 2001; Mein et al, 2003; Carneiro et al, 2009). A sujeira encontrada nos tetos e úbere é fonte de micro-organismos indesejáveis para a glândula mamária, sobretudo tetos com hiperqueratose.
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