View Full Table | Close Full ViewTable 1.

Number of records, mean, SD, and heritability for BW at 60, 120, 205, 365, and 550 d of age with the random regression and multitrait models

 
Model used2
Random regression model
Multitrait model
Weight1 N Mean3 SD3 h2 N Mean3 SD3 h2
W60 129 85.52 18.08 0.60 1,427 85.46 15.48 0.47
W120 159 134.18 21.59 0.34 4,782 131.11 22.69 0.44
W205 176 192.26 29.71 0.50 5,939 190.89 31.56 0.50
W365 203 237.96 40.87 0.67 2,920 245.01 43.16 0.62
W550 112 317.81 47.08 0.75 2,317 317.03 59.03 0.72
1W60 = BW at 60 d of age; W120 = BW at 120 d of age; W205 = BW at 205 d of age; W365 = BW at 365 d of age; W550 = BW at 550 d of age.
2N = number of records; h2 = additive heritability with SE ranging from 0.008 to 0.045.
3Expressed as kilograms.



View Full Table | Close Full ViewTable 2.

Estimates with the random regression model and multitrait model (in parentheses) for additive genetic correlation (above the top table diagonal), maternal genetic (below the top table diagonal), and animal permanent environmental (random regression model only, in the bottom table) for BW from 60, 120, 205, 365, and 550 d of age

 
W60
W120
W205
W365
W550
Weight1 Additive genetic and maternal genetic correlations
W60 0.42 (0.82) –0.08 (0.81) –0.06 (0.46) –0.12 (0.58)
W120 0.50 (0.70) 0.83 (0.86) 0.62 (0.67) 0.51 (0.52)
W205 0.20 (0.54) 0.94 (0.88) 0.87 (0.74) 0.77 (0.62)
W365 0.09 (0.49) 0.84 (0.84) 0.96 (0.94) 0.93 (0.87)
W550 –0.16 (0.51) 0.70 (0.82) 0.89 (0.96) 0.96 (0.80)
Animal permanent environmental correlations
W60 0.93 0.89 0.85 0.79
W120 0.98 0.76 0.53
W205 0.83 0.43
W365 0.60
W550
1W60 = BW at 60 d of age; W120 = BW at 120 d of age; W205 = BW at 205 d of age; W365 = BW at 365 d of age; W550 = BW at 550 d of age.



View Full Table | Close Full ViewTable 3.

Percentages and numbers of bulls (in parenthesis) that would be selected in common based on breeding values obtained with the random regression and multitrait models for BW from 60, 120, 205, 365, and 550 d of age for 5, 10, 20, and 50% selection intensities

 
Percentage of bulls selected
Weight1
Selection intensity W60 W120 W205 W365 W550
5% (192) 8% (16) 53% (101) 49% (95) 48% (93) 39% (75)
10% (384) 17% (67) 58% (225) 50% (193) 51% (197) 43% (166)
20% (768) 32% (251) 63% (487) 58% (446) 57% (443) 52% (402)
50% (1,920) 58% (1,113) 79% (1,516) 76% (1,453) 73% (1,417) 72% (1,380)
1W60 = BW at 60 d of age; W120 = BW at 120 d of age; W205 = BW at 205 d of age; W365 = BW at 365 d of age; W550 = BW at 550 d of age.