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	Deregressed PTA		Reliability
			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 breedinga	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

^aFor DFB, we used PTA as reliability was unavailable