Abstract
Carcass data from 5 years of a long-term, rotational , crossbreeding project were used to calculate heritabilities, genetic and phenotypic correlations , and management effects and to compare breeds for marbling, ribeye area, and hot carcass weight. Angus, Brahman, Charolais, Hereford, Polled Hereford, Gelbvieh, and Simmental breeds were involved. Sixty percent of the steer calves were fed as calves and 40% as yearlings. Heritabilities were .40 for marbling, .46 for ribeye area, and .51 for carcass weight. Genetic and phenotypic correlations were high between carcass weight and ribeye area but low between marbling and the other traits. Steers fed as calves had more marbling and lighter carcasses than steers fed as yearlings. Higher percentages of Gelbvieh or Brahman breeding resulted in lower (P<.05) marbling . Increased percentage of Charolais and Simmental breeding increased (P<.05) ribeye area and tended to increase carcass weight without reducing marbling.
Highlights
Marbling score, ribeye area, and carcass weight determine carcass value, but profit is determine d by the difference between carcass value and the cost of production
Genetic and phenotypic correlations were high between carcass weight and ribeye area but low between marbling and the other traits
Higher percentages of Gelbvieh or Brahma n breeding resulted in lower (P
Summary
Ribeye area, and carcass weight determine carcass value, but profit is determine d by the difference between carcass value and the cost of production. One major factor effecting cost of production is length of time the cattle must be maintained before slaughte r. Our objectives were to 1) determine the heritabilities and genetic correlations among marbling , ribeye area, and carcass weight; 2) determine the influence of postweaning management on these traits; and 3) compare additive genetic breed differences for these traits
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