The aim of the present study was to determine the relationship among body weight (BW), body condition score (BCS) and rump fat thickness (RFAT) measured by ultrasonography, and to evaluate the relationship between BCS and RFAT in cows pregnant and non pregnant. Ninety two Zebu (Brahman) cows had their BW, BCS and RFAT evaluated in different reproductive states: 1) non pregnant, 2) first gestation third, 3) second gestation third and 4) third gestation third. A BCS value was attributed for each cow following a 1 to 5 points scale. Ultrasonographic images for RFAT measurement were obtained using a 3.5 MHz linear transducer. Body condition scores, BW and ultrasound measurements were collected on the same day. The relationship between BCS, BW and RFAT values was investigated through correlation and regression models using SAS. The BCS was a relatively good predictor of RFAT (R 2 = 0.69; P<0.01), but only for non pregnant Zebu cows. Similarly, BCS was correlated (r = 0.77; P<0.01) with RFAT in non pregnant cows. Also, it was shown that BCS presented intermediate correlation (r = 0.45 to 0.69; P<0.05) with RFAT in pregnant cows. Additionally, both BCS and RFAT showed intermediate correlation (r = 0.36 to 0.48; P<0.05) with BW in pregnant cows. The BCS classification can be used to predict the RFAT in non pregnant Zebu cows.