The role of genotype on classification grades of beef carcasses produced under mexican tropical conditions

José Manuel Zorrilla-Ríos, Phillip Lancaster, Carla Goad, Gerald Horn, Margarita Hernández-Gallardo


The present study identified the distribution of22,850 beef carcasses belonging to three genotypesaccording to a visual judgment of the heightof the hump (large, indicative of Bos indicus;medium, Crosses between B. indicus and Bostaurus, and small, B. taurus) among the classificationgrades obtained under the Mexicannorm NMX-FF-078-SCFI-2002, at the No 51Federal Inspected Type abattoir, Tabasco State,southeastern Mexico. Chi-square analysis wasused to determine the association and the proportionof hump classification with carcass gradingcriteria. Fifty four percent of the carcasses classified as large hump (B. indicus breeding),35% as small hump (B. taurus breeding), and10.70% as medium hump (Crossbred). B. taurusand Crossbred genotypes had greater (P <0.0001) percentage of Select carcasses (17.90and 18.50%, respectively) and Standard grades(55.20 and 60.10%, respectively) than B. indicusgenotype (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 theoverall beef herd for the Mexican tropics, B.taurus, B. indicus, and Crossbred were presentat the Select beef carcass classification grade suggestingthat genotype is not a factor introducingbias in the Mexican carcass classification normNMX-FF-078-SCFI-2002.

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