Table 1 Number of Holstein bulls, mean and standard deviation (SD) of PTAs, and reliabilities for 35 dairy traits

Trait Name

Abbreviation

N of Bulls

Mean

SD

Mean

SD

Milk yield

Milk

27,156

−245.86

850.58

0.860

0.082

Fat yield

Fat

27,156

−5.92

30.52

0.860

0.082

Protein yield

Protein

27,156

−5.31

23.84

0.863

0.083

Fat percentage

Fat_Percent

27,156

0.0136

0.107

0.860

0.082

Protein percentage

Pro_Percent

27,156

0.0086

0.0464

0.863

0.083

Net merit

Net_Merit

27,161

−106.91

278.63

0.763

0.110

Productive life

Prod_Life

26,727

−1.367

3.461

0.682

0.145

Somatic cell score

SCS

27,143

3.027

0.235

0.786

0.110

Age at first calving

AFC

16,314

−0.446

11.855

0.439

0.258

Days to first breeding^a

DFB

11,713

0.534

2.825

NA

NA

Daughter pregnancy rate

Dtr_Preg_Rate

25,699

−0.593

3.025

0.618

0.185

Heifer conception rate

Heifer_Conc_Rate

19,334

−0.660

9.610

0.377

0.210

Cow conception rate

Cow_Conc_Rate

20,380

−1.053

6.879

0.597

0.202

Sire calving ease

Sire_Calv_Ease

26,345

7.959

2.461

0.671

0.224

Daughter calving ease

Dtr_Calv_Ease

23,263

9.141

3.182

0.594

0.176

Sire stillbirth

Sire_Still_Birth

21,543

8.190

1.831

0.495

0.249

Daughter stillbirth

Dtr_Still_Birth

20,424

8.085

2.958

0.508

0.222

Final score

Final_score

25,638

−0.817

1.484

0.702

0.140

Stature

Stature

25,641

−0.482

1.532

0.844

0.079

Strength

Strength

25,633

−0.278

1.513

0.743

0.147

Dairy form

Dairy_form

25,615

−0.492

1.745

0.752

0.132

Foot angle

Foot_angle

25,626

−0.742

2.263

0.664

0.198

Rear legs (side view)

Rear_legs(side)

25,641

−0.009

1.734

0.754

0.137

Body depth

Body_depth

25,636

−0.413

1.622

0.720

0.180

Rump angle

Rump_angle

25,641

0.038

1.482

0.828

0.089

Rump width

Rump_width

25,641

−0.504

1.543

0.766

0.114

Fore udder attachment

Fore_udder_att

25,640

−0.908

1.852

0.781

0.112

Rear udder height

Rear_ud_height

25,640

−0.885

2.095

0.737

0.136

Udder depth

Udder_depth

25,631

−0.653

1.665

0.836

0.082

Udder cleft

Udder_cleft

25,641

−0.720

1.980

0.718

0.156

Front teat placement

Front_teat_pla

25,641

−0.562

1.663

0.781

0.106

Teat length

Teat_length

25,631

0.104

1.482

0.815

0.087

Rear legs (rear view)

Rear_legs(rear)

24,763

−0.759

2.709

0.605

0.178

Feet and legs composite

Feet_and_legs

25,608

−0.928

2.501

0.600

0.208

Rear teat placement

Rear_teat_pla

25,492

−0.436

1.900

0.762

0.103