Resumen

TRUJILLO, Carlos M; GALLEGO, Andrés F; RAMIREZ, Nicolás  y  PALACIO, Luis G. Prevalence of mastitis in dairy herds in Eastern Antioquia. Rev Colom Cienc Pecua [online]. 2011, vol.24, n.1, pp.11-18. ISSN 0120-0690.

Seven dairy cattle farms from eastern Antioquia were tested for mastitis in a cross-sectional study with a non-probabilistic convenience sampling procedure. Each udder quarter of 290 lactating cows was evaluated through the California Mastitis Test in order to determine the prevalence of subclinical mastitis. Milk from positive quarters underwent somatic cell count (SCC), cell culture and antibiotic sensitivity tests. The prevalence of subclinical mastitis per quarter was 19.9% (228 quarters). Only 11 quarters (0.95%) had clinical mastitis. The average SCC for all quarters was 1,105,733 cells/mL. Streptococcus dysgalactiae was the most common bacteria observed (29.5%) in the 226 cultures evaluated, followed by coagulasenegative staphylococci (CNS, 23%), and Staphylococcus aureus (10.3%). The frequency of contagiouspathogens and environmental pathogens was 37.8% and 49.3%, respectively. This study confirms that mastitis remains elevated in this region, suggesting a continuous lack of milking hygiene and education of farm personnel.

Palabras clave : antibiogram; somatic cells; subclinic mastitis.

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