Genetic analysis of teat number in pigs reveals some developmental pathways independent of vertebra number and several loci which only affect a specific side

Table 2 Summary statistics from GENSEL genome-wide association analysis of animals genotyped with the Illumina Porcine SNP60v1 BeadChip (n = 2951)

Trait	Genomic variance (GV)	Phenotypic variance	Genomic heritability	Number of 1-Mb windows >1% GV	Percent of GVexplained by 1-Mb windows^a	Mean	Range
TTN	0.221	0.948	0.233	15	30.6	15.8	8 to 20
LTN	0.034	0.356	0.096	18	57.4	7.6	5 to 10
RTN	0.035	0.396	0.088	13	50.6	7.7	2 to 10
MAX	0.040	0.345	0.115	18	54.2	7.9	6 to 10
L − R	0.001	0.528	0.002	4	9.2	−0.05	−3 to 4
DIF	0.001	0.312	0.006	6	26.0	0.47	0 to 4

LTN left side teat number, MAX maximum teat number of a side, RTN right side teat number, TTN total teat number, L − R difference between LTN and RTN, and DIF absolute value of L − R
^aPercentage of phenotypic variation explained by markers, as predicted by GENSEL, that was explained by SNPs contained in 1-Mb windows that exceeded the 1% genomic variation threshold

ISSN: 1297-9686