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Abstract
With the objective to know the mastitis cost for milk producer, was developed this study,
with duration of a year in a milk farm of the North region of Sonora. The cost of the clinical and
subclinical mastitis was estimated, taking into account the milk production, treatment costs and
commercial milk value. The information was recorded monthly, the incidence of subclinical
mastitis was obtained using California MastitisTest (CMT) and clinical mastitis incidence was
obtained from farm health records. Was an incidence average of 18,3% of subclinical mastitis,
whereas the incidence of the clinical form of mastitis was of 5,35%. The average monthly cost
of each animal with mastitis was $185.40; altogether the mastitis had a cost of $30.966,34
annually, corresponding $12.470,75 (40,3%) to subclinical mastitis and $18.459,59 (59,7%) to
clinical mastitis. Diseases total cost represents a third part of annually obtained milk
production in the milk farm.