Schalm and Freiso tests were used as a routine tests for the detection of subclinical mastitis amongst dairy herd of 112 Fries ian cows. was found that the reliability of Schalm test (96.3%) was superior than Frieso test (89.5%).
The isolated micro-organisms (Strept. agalactiae, Strept dysagelac tiae, Staph. aureus and E. coli) were sensitive to the following antibiotics in descending order: Gentamycin, Neomycin, penicillin, Kanamycin, and Streptomycin. Variation in the vitro and in vivo action of antibiotics was enocumtered, and the results are discussed.