Relationship between occurrence of mastitis pathogens in dairy cattle herds and raw-milk indicators of hygienic-sanitary quality

Abstract

Mastitis is an inflammation of the mammary glands and in most cases it is caused by the presence of microorganisms. High mastitis rates in dairy cattle herds can cause an increase in total microorganism counts of bulk tank milk. The present paper was aimed at verifying whether the occurrence of mastitis in dairy cattle herds is reflected in raw-milk indicators of hygienic-sanitary quality. To observe the correlation among the analysed variables, we performed a logarithmical transformation (log10) of different indicator counts of raw milk and compared them with the occurrence of mastitis in dairy cattle herds. Few correlations were observed among mastitis cases in dairy cattle herds and the raw-milk indicators of hygienic-sanitary quality. We observed a negative correlation between the log10 of mesophilic aerobic plate counts and psychotropic aerobic plate counts when compared with the occurrence of no bacterial growth. The log10 of thermophilic aerobic plate counts and yeasts and mould aerobic plate counts presented a positive correlation with the cases of infectious mastitis and mastitis caused by Staphylococcus spp.

In vitro photoinactivation of bovine mastitis related pathogens

“…Due to the importance of the prevalence of clinical or subclinical mastitis in Brazil [22][23][24], wild-type strains of S. aureus, S. agalactiae, S. dysgalactiae, and C.…”

Effect of somatic cell count on composition and hygiene indicators of bulk tank milk

“…Zucali et al (2011) reported that herds with > 50% of cows that presented hygiene score 3 (moderately dirty) and 4 (very dirty) were associated with higher values of TBC, PC, and CC from bulk tank milk than herds with cows presenting lower scores of teats and udder hygiene. Although mastitis is one of the factors that contribute to contamination of bulk tank milk, deficiencies of hygiene during milking and milk processing have a huge influence on hygiene indicators, more than contamination caused by microorganisms from the mammary gland (SOUTO et al, 2008).…”

“…Psychrotrophic microorganisms are widely found in the environment and the presence of these bacteria in bulk tank milk is indicative of failure in cleaning of the milking machine (CEMPÍRKOVÁ; MIKULOVÁ, 2009). These bacteria synthesize heat-resistant enzymes, which hydrolyze milk fat and protein, resulting in reduced dairy product quality and shelf life (SVENSSON et al, 2006). The synthesis of these enzymes is directly associated with PC, so that the greater the PC, the more enzyme is produced and lower the shelf life of the dairy products (CEMPÍRKOVÁ; MIKULOVÁ, 2009).…”

Qualidade do leite cru e práticas de manejo em fazendas leiteiras

“…A importância da identificação dos agentes causadores e determinação da prevalência de mastite em rebanhos ocorre em razão desta doença resultar em inúmeros prejuízos à cadeia agroindustrial do leite, pois além de ser uma das causas de aumento da CBT (SOUTO et al, 2008), reduz também a produção de leite por vaca, causa alterações na composição dos produtos lácteos e aumenta custos com medicamentos e descarte do leite com resíduos de antibióticos. A caracterização do tipo de micro-organismo predominante no leite de tanque é de grande relevância na implantação de programas de controle da mastite e melhoria da qualidade do leite WOLFGANG, 2003).…”