Table 1. Family structure in three swine breeds.

Breeda	No. piglet	Original parentsb		Corrected parentsc
		No. boars	No. sows	No. boars	No. sows
LR	67	4	13	6	16
LW	161	7	29	8	37
SB	73	3	13	3	13

^aLR, Landrace; LW, Yorkshire; SB, Songliao Black;

^bParents in the original parentage records;

^cParents after correction for the original parentage errors using SNP genotype information.