Genetic correlations between live yearling bull and steer carcass traits adjusted to different slaughter end points. 2. Carcass fat partitioning.

摘要: We studied genetic relationships between age-constant live yearling beef bull growth and ultrasound traits steer carcass with dissected lean percentage adjusted to slaughter age-, HCW-, fat depth-, marbling score-constant end points. Three measures of were used. Blue Tag (BTLean) was predicted from HCW, depth, LM area measurements. Ruler (RulerLean) depth width Dissected (DissLean) based on dissection the 10-11-12th rib section. Both BTLean (h2 = 0.30 0.44) DissLean 0.34 0.39) more heritable than RulerLean 0.05 0.14) at all Genetic correlations among (rg 0.61 0.70), 0.56 0.72), 0.59 0.90) indicated that these not genetically identical. Adjusting Diss-Lean different points changed magnitude, but generally direction, indicator traits. Ultrasound scan-age-constant estimates 0.26 0.42) correlated each other 0.68 0.99) had greater age 0.24 0.48) HCW 0.16 0.40) -0.08 0.13) score 0.02 0.11) Scan-age-constant also stronger -0.34) -0.25) -0.02) -0.03) Yearling positively endpoints 0.11 0.23). method 1 0.38 0.56) 2 -0.17 -0.38) measurements suggested shape may be a valuable addition improvement programs for age, constant At points, -0.60 -0.64) 0.48 0.59) associations did corresponding Improved methods combine would beneficial evaluating or