Antimicrobial residues in milk and occurrence of clinical and subclinical mastitis in herds in the region of Campinas, São Paulo.

  • Claudia Rodrigues Pozzi Centro Apta Bovinos de Leite - Instituto de Zootecnia - Nova Odessa-SP
  • Aline Francielle Silva Santos Centro Apta Bovinos de Leite Instituto de Zootecnia
  • Thamires Martins Centro Apta Bovinos de Leite Instituto de Zootecnia
  • Carlos Eduardo Oltramari Universidade do Oeste de Santa Catarina
  • Luis Alberto Ambrósio Centro Apta Bovinos de Leite Instituto de Zootecnia
  • Mariana Santos Miranda Centro Apta Bovinos de Leite Instituto de Zootecnia
  • Juliana Rodrigues Pozzi Arcaro Centro Apta Bovinos de Leite Instituto de Zootecnia

Resumo

The aim of this study was to evaluate the occurrence of clinical and subclinical mastitis and antimicrobial residues in milk samples from mammary quarters of 259 lactating cows of five properties in the region of Campinas-SP, Brazil. The Tamis test and the California Mastitis Test (CMT) were used to diagnose clinical and subclinical mastitis, respectively. The somatic cells count (SCC) was done in milk samples of weigh jars and cooling tanks. The presence of antimicrobial residues was analyzed in milk samples of the mammary quarters, weigh jars and cooling tanks, with a microbiological test (Delvotest SP). Milk samples were collected for microbiological isolation of mastitis-causing agents. Clinical and subclinical mastitis occurred in 2.32% to 16.66% and 21.00% to 69.1% of the mammary quarters, respectively. The SCC in the cooling tanks ranged between 221 and 1,124 x 103 cells/mL. Coagulase-negative Staphylococci were isolated in 45.93% of the milk samples. The analysis of the antimicrobial residues in the weigh jars and in mammary quarters showed 8.33% and 4.30% of samples testing positive, respectively. The presence of antimicrobial residues was detected in 5% of the cooling tanks. The findings point to the need to implement practices that focus on milk quality.

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Publicado
2014-04-08
Seção
Original Articles / Artigos de Pesquisa