Table 1. Summary of genome-wide marker and core region (CR) distribution in Chinese Holstein.

Chr	Chr length (Mbp)	SNP (n)	Mean distance (kb)	CR (n)	Total CR Length(kb)	Max CR Length(kb)	Mean CR Length(kb)	CR SNPs(n)a	Max CR SNPs(n)
1	161.06	2610	61.7	292	40305.4	628.64	138.0±90.2	1099	11
2	140.63	2109	66.7	228	32967.5	696.32	144.6±102.5	839	9
3	127.91	2025	63.2	222	32430.1	1073.97	146.1±117.3	820	9
4	124.13	1935	64.1	196	26006.6	509.61	132.7±90.2	709	9
5	125.80	1681	74.8	152	23513.1	561.02	154.7±100.6	554	12
6	122.54	1982	61.8	206	28214.8	558.29	137.0±99.9	774	10
7	112.06	1759	63.7	176	24310.3	1131.54	138.1±117.7	631	8
8	116.94	1851	63.2	190	26709.9	600.82	140.6±92.1	716	9
9	108.07	1570	68.8	155	20279.0	588.08	130.8±85.6	563	9
10	106.20	1683	63.1	173	20536.7	347.15	118.7±63.2	624	8
11	110.17	1780	61.9	194	23677.6	780.69	122.0±91.4	684	10
12	85.28	1290	66.1	120	16387.3	618.68	136.6±104.5	421	7
13	84.34	1373	61.4	142	18376.8	517.75	129.4±87.1	517	11
14	81.32	1360	59.8	152	21804.0	548.68	143.4±98.6	549	10
15	84.60	1324	63.9	136	19048.2	780.38	140.1±100.9	484	7
16	77.82	1231	63.2	134	17809.6	730.69	132.9±85.0	502	11
17	76.45	1250	61.2	127	15106.7	368.96	119.1±66.1	442	8
18	66.12	1072	61.7	84	10677.9	690.26	127.1±89.3	289	6
19	65.21	1106	59.0	91	11736.3	622.59	129.0±98.6	347	6
20	75.71	1250	60.6	115	14453.6	313.29	125.7±65.6	413	8
21	69.17	1072	64.5	100	12443.5	490.57	124.4±75.0	347	6
22	61.83	980	63.1	108	12539.8	487.54	116.1±66.6	364	6
23	53.33	870	61.3	79	9709.7	502.67	122.9±87.3	267	8
24	64.95	993	65.4	89	10595.9	518.43	119.1±86.6	302	7
25	44.02	790	55.7	76	7983.1	359.94	105.0±61.4	254	5
26	51.73	834	62.0	83	9855.6	463.48	118.7±67.7	288	6
27	48.73	774	63.0	64	7273.0	385.59	113.6±66.7	210	6
28	46.00	748	61.5	50	6432.7	324.42	127.8±61.7	167	5
29	51.98	828	62.8	62	7923.9	321.19	127.8±61.7	215	6
Total	2544.1	40130	63.4	3996	529108.6	16521.24	129.7±85.6	14364	12

^a: the number of SNPs involved in core regions of each chromosome.