Table 2.

Distribution of genotyped pigs across years for different core definitions when the core size was equal to the number of largest eigenvalues explaining 99% of variation in the genomic relationship matrix (n = 7320 animals)

Year	Total	Core definition
		MPA	Rnd	Ped	Fam	Unrel	LPM	LPF	QR
2012	198	73	11	15	31	27	NA	NA	165
2013	866	312	47	54	134	85	1	1	510
2014	1731	749	108	118	275	137	3	2	918
2015	2968	922	204	205	442	309	1	1	1677
2016	7911	796	490	552	795	652	91	92	3444
2017	13,269	1766	866	926	1064	695	182	181	203
2018	27,766	1676	1819	1938	1667	1475	181	180	NA
2019	28,701	1014	1910	1915	1592	1565	1538	1538	NA
2020	27,184	12	1803	1529	1320	2163	5315	5317	NA
Suma	110,594	7320	7258	7252	7320	7108	7312	7313	6917

MPA: popular animals with more than 15 progeny, both parents known and with own performance record; Rnd: a random subset of animals is sampled from all genotyped animals; Ped: animals were evenly selected from the pedigree sorted in genealogical order; Fam: from each full sib family, one progeny was allowed to be in the core group; Unrel: animals with $\le$ 0.27 genomic relationship were assigned to the core group; LPM: males with both parents known, without progeny, and without own performance records were used as core; LPF: females with both parents known, without progeny and own performance records were used as core; QR: animals selected based on a QR decomposition of the gene content matrix

^aSome core definitions resulted in less than 7320 individuals because of missing birth year