Worldwide bovine mastitis (clinical and subclinical) is one of the most important diseases causing considerable economic loss to the farmers in dairy industry. The causative organisms of mastitis are ubiquitous in nature and persist long time in the cow yard or barns. Reduction in milk Production in subclinical mastitis (SCM) is not only a reason of great economic loss to the dairy industry but also acts as a carrier & source of infection for the healthy milch cows which is one of the biggest obstacle in the achievement of self-sufficiency in milk production in Bangladesh. On the other hand,...