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| Subclinical mastitis (SCM) is an over emphasized form of mastitis causes great economical loss in dairy farms due to reduction in milk production. The aim of the study was to estimate the prevalence of subclinical mastitis in crossbred (local Zebu x Holstein Friesian or Sahiwal or Sindhi) and indigenous lactating cows. The study was carried out in different small scale dairy farms in Bijoynagar Upazila under Brahmanbaria district, Bangladesh. Bijoynagar Upazila consists of 10 unions. A total of 400 milk samples, 40 from each union, were screened for SCM by California Mastitis Test (CMT). A total of 115 cows were found positive for SCM. The overall prevalence of SCM in lactating cows was 28.75% of which 30% at Chandura union, 32.5% at Paharpur union, 20% at Potton union, 27.5% at Bodonti union, 32.5% at Isapura union, 25% at Chorislampur union, 37.5% at Horospur union, 22.5% at Chompoknagar union, 32.5% at Singerbil union and 25% at Bisnopur union. The prevalence of SCM significantly increased with age and parity of cows in Bijoynagar upazila under Brahmanbaria district, Bangladesh. This study may help the dairy farmer to take necessary precursors against SCM and recover economic losses causes by SCM.

Prevalence of Subclinical Mastitis of Dairy Cows in Bijoynagar Upazila under Brahmanbaria District of Bangladesh