Genotype-by-environment interactions for reproduction, body composition, and growth traits in maternal-line pigs based on single-step genomic reaction norms

Table 1 Descriptive statistics for trait phenotypes and effects included in the mixed model for each trait

Trait	Descriptive statistics			Effects included in the mixed models
Trait	Number of records	SD	Number (estimates) of CG	Fixed effects	Covariates	Random effects
TNB	186,189	3.41	474 (− 2.90–3.50)	FP, CG_R	fAge, fAge2	a, pe, ce
NBA	185,824	3.22	474 (− 3.04–3.26)	FP, CG_R	fAge, fAge2	a, pe, ce
NW	8164	2.74	140 (− 3.69–2.70)	FP, CG_R	fAge, wAge, wAge2	a, pe, ce
WW	27,412	1.87	75 (− 1.49–2.80)	Sex, BP, CG_G	wAge	a, ce
OW	101,541	25.63	256 (− 1.93–2.01)	Sex, BP, CG_G	oAge, oAge2, wAge, wAge2	a, ce
MD	20,149	6.45	86 (− 1.92–2.84)	Sex, BP, CG_G	oAge, oAge2, wAge, wAge2	a, ce
BF	20,175	4.13	87 (− 2.72–2.46)	Sex, BP, CG_G	oAge, oAge2, wAge	a, ce

TNB, total number of piglets born; NBA, number of piglets born alive; NW, number of piglets weaned; WW, weaning weight (kg); OW, off-test weight (kg); MD, ultrasound muscle depth (mm); BF, ultrasound backfat thickness (mm)
Number of records, number of phenotypic records after quality control; SD: standard deviation; CG, contemporary group; the effects of CG are the standardized ranges
FP, farrowing parity; BP, birth parity; CG_R, reproduction contemporary group; CG_G, growth contemporary group
fAge, linear effect of farrowing age; fAge2, quadratic effect of farrowing age; wAge, linear effect of weaning age; wAge2, quadratic effect of weaning age; oAge, linear effect of off-test age; oAge2, quadratic effect of off-test age
a, additive genetic effect; pe, animal permanent environmental effect across parities; ce, litter effect

ISSN: 1297-9686