Table 1.

Background information on the data sources used in the pooled, multistudy analysis of birth weight threshold

Study	Farm	Country	Piglet sire line	Piglet dam line	Sow parity	Piglet records	Weaning age, days
Bergstrom, 2011	1	USA	PIC327	Triumph TR4 × PIC 1050; PIC 1050	1–9	2,205	22–28
Jourquin et al., 2015	2	Spain	Pietrain	Large White × Landrace	2–8	772	21–29
Jourquin et al., 2015	3	Spain	Pietrain	ACMC	2–8	632	21–29
Jourquin et al., 2015	4	Spain	Pietrain	Large White × Landrace	2–8	459	21–29