The extent of linkage disequilibrium in beef cattle breeds using high-density SNP genotypes

Table 1 Description of samples and summary of results ^*

Breed	Breed type	Total nb	Nb of males	Pn	He	LD at 10 kb autos	LD at 10 kb BTAX	LD at 70 kb autos	LD at 70 kb BTAX
*Australian population*
Angus	Bt	195	165	0.85	0.27	0.46	0.47	0.20	0.25
Hereford	Bt	79	73	0.85	0.31	0.49	0.51	0.23	0.28
Limousin	Bt	62	58	0.86	0.30	0.42	0.49	0.15	0.23
Shorthorn	Bt	130	127	0.90	0.25	0.43	0.46	0.19	0.27
Tropical Composite	Bt × Bi	351	186	1.00	0.35	0.30	0.43	0.13	0.33
Santa Gertrudis	Bt × Bi	168	82	0.99	0.33	0.32	0.47	0.16	0.37
Belmont Red	Bt × Bi	97	77	1.00	0.34	0.33	0.44	0.15	0.34
Brahman	Bi	519	304	1.00	0.26	0.25	0.42	0.13	0.32
*Bovine HapMap population*
Angus	Bt	55	42	0.84	0.29	0.46	0.47	0.20	0.23
Santa Gertrudis	Bt × Bi	35	32	0.98	0.34	0.34	0.48	0.18	0.39
Brahman	Bi	46	36	0.91	0.25	0.28	0.43	0.16	0.33

^*Bt = Bos taurus; Bi = Bos indicus; Bt × Bi = composite breed; Pn = proportion of polymorphic SNPs; He = gene diversity or heterozygosity; 10 kb = average r² of all pairs of SNPs that are between 9.5 to 10.5 kb apart; Autos = autosomes; 70 kb = average r² of all pairs of SNPs that are between 69.5 to 70.5 kb apart.

ISSN: 1297-9686