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Number of animals with record, data structure, no. animals in pedigree file, no. sires and dams, and average family size within each breed considered in the study

 
Breed
Item Chianina Marchigiana Romagnola
Animals with record, no. 10,658 5,440 4,774
Average record per year, no. 2,665 1,360 1,194
Average record per slaughterhouse, no. 484 247 682
Average record per year × slaughterhouse, no. 121 62 171
Animals in pedigree file, no. 24,070 13,579 13,216
Sires, no. 740 417 467
Dams, no. 8,477 4,532 3,815
Average sons per sire, no. 14.4 13.0 10.2
Average sons per dam, no. 1.3 1.2 1.3



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Descriptive statistics and Kolmogorov-Smirnov normality tests (Norm. K-S; with significance within brackets; SAS Inst. Inc., Cary, NC) for age at slaughter, carcass weight, and carcass weight gain of Chianina, Marchigiana, and Romagnola young bulls retained for the study

 
Breed
Item Chianina Marchigiana Romagnola
Observations, no. 10,658 5,440 4,774
Age at slaughter, d
    Mean ± SD 628.2 ± 66.1 631.1 ± 72.0 645.9 ± 66.5
    Range 451.0 to 780.0 450.0 to 766.0 450.0 to 775.0
    Norm. K-S 0.056 (<0.01) 0.082 (<0.01) 0.103 (<0.01)
Carcass weight, kg
    Mean ± SD 479.0 ± 65.3 432.9 ± 58.0 433.3 ± 52.9
    Range 226.0 to 713.0 203.0 to 645.0 240.0 to 623.0
    Norm. K-S 0.015 (<0.01) 0.015 (<0.01) 0.014 (0.017)
Carcass weight gain, g/d
    Mean ± SD 768 ± 112 693 ± 107 675 ± 85
    Range 342 to 1,183 367 to 1,102 386 to 1,010
    Norm. K-S 0.013 (<0.01) 0.017 (<0.01) 0.015 (0.013)



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Estimated marginal posterior densities of genetic variance (σ2a), residual variance (σ2e), and h2 for age at slaughter (AS), carcass weight (CW), CW with AS as covariate, and carcass weight gain for Chianina, Marchigiana, and Romagnola young bulls

 
Breed
Chianina
Marchigiana
Romagnola
Item Mean ± SD HDP 95%1 Mean ± SD HDP 95%1 Mean ± SD HDP 95%1
Age at slaughter, d
    σ2a 541 ± 75 393; 689 723 ± 169 391; 1,055 882 ± 133 621; 1,142
    σ2e 1,414 ± 61 1,295; 1,534 1,372 ± 129 1,120; 1,624 1,398 ± 104 1,194; 1,603
    h2 0.276 ± 0.040 0.206; 0.346 0.344 ± 0.073 0.201; 0.486 0.386 ± 0.052 0.284; 0.488
Carcass weight, kg
    σ2a 318 ± 67 187; 449 449 ± 132 190; 708 466 ± 92 286; 647
    σ2e 2,060 ± 61 1,940; 2,180 1,537 ± 105 1,331; 1,743 1,479 ± 78 1,325; 1,633
    h2 0.134 ± 0.030 0.080; 0.187 0.225 ± 0.062 0.104; 0.347 0.239 ± 0.044 0.152; 0.326
CW with AS covariable, kg
    σ2a 440 ± 70 303; 577 507 ± 131 251; 764 548 ± 90 379; 724
    σ2e 1,789 ± 61 1,670; 1,908 1,396 ± 104 1,193; 1,599 1,278 ± 76 1,129; 1,426
    h2 0.197 ± 0.030 0.138; 0.256 0.265 ± 0.064 0.141; 0.390 0.300 ± 0.045 0.211; 0.389
CW gain, g/d
    σ2a 1,853 ± 245 1,373; 2,333 2,448 ± 541 1,388; 3,509 2,262 ± 329 1,617; 2,908
    σ2e 5,067 ± 203 4,669; 5,464 3,861 ± 407 3,065; 4,658 3,170 ± 255 2,669; 3,671
    h2 0.267 ± 0.033 0.203; 0.332 0.386 ± 0.076 0.237; 0.536 0.416 ± 0.054 0.311; 0.521
1lower and upper bounds of the 95% highest posterior density interval



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Rank correlations (and SE of correlation within brackets) obtained from EBV, produced by univariate BLUP analysis of carcass weight (CWU) or bivariate analysis carcass weight with age at slaughter (CWB), univariate CW analysis with age at slaughter as covariate (CWU-AS), and univariate analysis of carcass weight gain (CWG) in Chianina, Marchigiana, and Romagnola breeds

 
Breed
Rank correlation1 Chianina Marchigiana Romagnola
CWU with:
CWU-AS 0.875 (0.052) 0.967 (0.027) 0.897 (0.047)
CWB 0.861 (0.054) 0.986 (0.018) 0.973 (0.025)
CWU-AS with:
CWB 0.965 (0.028) 0.988 (0.016) 0.956 (0.031)
CWG with:
CWU 0.641 (0.082) 0.781 (0.067) 0.529 (0.090)
CWU-AS 0.913 (0.043) 0.901 (0.046) 0.828 (0.060)
CWB 0.893 (0.048) 0.856 (0.055) 0.676 (0.079)
1Correlation was obtained considering the first 90 ranked animals within breed for CWU chosen among sires with high accuracy (i.e., sires with at least 12 sons slaughtered).