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The present study identified the distribution of 22,850 beef carcasses belonging to three genotypes according to a visual judgment of the height of the hump (large, indicative of Bos indicus; medium, Crosses between B. indicus and Bos taurus, and small, B. taurus) among the classification grades obtained under the Mexican norm NMX-FF-078-SCFI-2002, at the No 51 Federal Inspected Type abattoir, Tabasco State, southeastern Mexico. Chi-square analysis was used to determine the association and the proportion of hump classification with carcass grading criteria. Fifty four percent of the carcasses classified as large hump (B. indicus breeding), 35% as small hump (B. taurus breeding), and 10.70% as medium hump (Crossbred). B. taurus and Crossbred genotypes had greater (P < 0.0001) percentage of Select carcasses (17.90 and 18.50%, respectively) and Standard grades (55.20 and 60.10%, respectively) than B. indicus genotype (10.10% for Select and 39.30% for Standard). B. indicus genotype had greater (P < 0.0001) percentage of Commercial carcasses (36.20%) and Out of Grade (14.40%) grades. The three genotypes representing the overall beef herd for the Mexican tropics, B. taurus, B. indicus, and Crossbred were present at the Select beef carcass classification grade suggesting that genotype is not a factor introducing bias in the Mexican carcass classification norm NMX-FF-078-SCFI-2002. [ABSTRACT FROM AUTHOR]