Association of Milk Somatic Cell Count with Bacteriological Cure of Intramammary Infection-A Review

Mastitis is a costly disease in dairy cattle as a result of decreased milk production, discarded milk, and other economic drivers such as treatment costs. Although it can be costly, effective antibiotic therapy is useful to ensure the health and productivity of dairy cattle. Antibiotic usage to treat mastitis can be implemented after diagnosis based upon detection of increased milk somatic cell counts (SCC). Previous work demonstrated antibiotic treatment tends to be more effective when milk SCC are lower prior to treatment. An approach to increasing the cure rates of mastitis may be evaluating milk SCC prior to administering treatment. In order to investigate this potential tool, an effective and reliable method to enumerate SCC is critical. In this review, we (a) dissect the different definitions of cure, (b) review the methods available for enumerating SCC, and (c) discuss factors that are associated with intramammary infection cure with an emphasis on SCC.