Significant associations from the single marker analyses.

Number of markers with for the additive (A), dominance (D), or imprinting (I) in each region and for each population. The traits included in the analyses were: LB = number of piglets born alive in a litter, LW = weight of the liveborn piglets in a litter in kg; TB = number of piglets born in a litter; TW = weight of the piglets born in a litter in kg. See Table 3 for explanation of the regions. See the supplemental file S1 for the corresponding p-values of individual markers.