Table 3 Descriptive statistics for traits related to litter size and growth. Litter size and litter weight was recorded in first (LS0_1, LW0_1) and partially also in second (LS0_2, LW0_2) parity females. Body mass of both sexes was measured at days 21 (BM21), 42 (BM42), 63 (BM63) after birth as well as at day of mating (BMM)

Trait	N	Generation^{^a}	Mean (SD)
LS0_1	4,430	F₂-F₂₉	16.025 (3.286)
LS0_2	1,481	F₂, F₂₂-F₂₅	16.315 (3.766)
LW0_1	4,410	F₂-F₂₉	27.456 (4.807)
LW0_2	1,474	F₂, F₂₂-F₂₅	28.627 (5.530)
BM21	19,080	F₂-F₃₀	10.878 (2.013)
BM42	14,586	F₂-F₃₀	29.439 (3.787)
BM63	13,910	F₂-F₃₀	35.185 (3.801)
BMM	7,416	F₂-F₂₉	36.418 (4.167)

↵a Generation, generations from which phenotypic records were available. For instance, for trait LW0_1 data were recorded from generations from F₂ to F₂₉ and for trait LW0_2 data were only recorded from five generations F₂, F₂₂, F₂₃, F₂₄ and F₂₅.