Genome-wide association analyses identify known and novel loci for teat number in Duroc pigs using single-locus and multi-locus models

Table 4 The frequencies and associations of the VRTN mutation (g.20311_20312ins291) with teat number in two Duroc pig populations

Population	No. of animals	Genotype frequency ^a			Allele frequency		Phenotypic value ^b			R² (%)	P-value
Population	No. of animals	ins/ins	ins/del	del/del	ins	del	ins/ins	ins/del	del/del	R² (%)	P-value
American Duroc	1496	0.66 (988)	0.31 (460)	0.03 (48)	0.82	0.18	10.90 ± 1.00	10.77 ± 0.97	10.56 ± 0.79	0.50	0.032
Canadian Duroc	2025	0.24 (479)	0.51 (1034)	0.25 (512)	0.49	0.51	11.42 ± 1.22	10.86 ± 1.06	10.54 ± 1.02	7.80	6.81E-20

^aFrequency of each genotype and the mutant allele (ins) associated with increased teat number at the VRTN mutation site are shown in this table. The number of pigs within each genotype is given in parentheses ^b Phenotypic values are shown in mean ± standard deviation

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