an estimation of national average of milk somatic cell count and production losses due to subclinical mastitis in commercial dairy herds in iran

u sing the database of the animal breeding center ofiran and based on the eligible test-day data from 78969 cows in five provinces: tehran (with 44129 cows), ghazvin (6668), zanjan (1767), isfahan (7572), khorasan-e-razavi (14521) and others (4312) the averages of 426850 ± 966840 and 473860 ± 605330 cells/ml of milk somatic cell count (scc) was calculated for individual cows and herds respectively. a pearson's correlation coefficient of -0.174 revealed a highly significant negative correlation between test-day milk production and scc (p