Senthilkumar, VTANUVAS2019-12-102019-12-102017-01http://krishikosh.egranth.ac.in/handle/1/5810137227TNV_SNLX_2017_4(3)1-4The epidemiological measures (Relative Risk, Odds Ratio, Attributable Rate and Attributable Fraction Percentage) of association between species, breed, stage of lactation, milk yield and order of lactation factors and the ketosis in dairy animals were studied in Namakkal and Karur districts of Tamil Nadu. For this study, 30 (18 Namakkal and 12 Karur) ketosis affected dairy animals (22 cows and 8 buffaloes) were selected randomly. RR indicated that the rate of ketosis in exotic / crossbred cows were 1.405 times greater than that of the rate of ketosis in native / non descriptive cows and the Odds Ratio of 1.419 also implied same. The calculated Attributable Rate for breed factor of 0.009 for cows and 0.0045 for buffaloes implied that the rate of ketosis in dairy animals that might be attributed to exotic / crossbred / upgraded germ plasm was 0.90 per cent and 0.45 per cent, respectively. The parity in cows was 3.16 per cent (AR) and 78.51 per cent (AFP) of ketosis in higher parity animals could be attributed to the higher parity factor.enVeterinary ScienceArticle