Effect of recent and ancient inbreeding on production and fertility traits in Canadian Holsteins

BMC Genomics

Table 3 Estimates of inbreeding depression on production and fertility traits per 1% increase in classical inbreeding and their standard errors

Traits^a	F_PED^b		F_ROH^b		F_GRM^b
Traits^a	Estimates	SE	Estimates	SE	Estimates	SE
MY (kg)	−44.71^***	6.47	−40.48^***	3.80	−48.72^***	4.49
FY (kg)	−1.65^***	0.27	−1.40^***	0.16	−1.75^***	0.19
PY (kg)	−1.38^***	0.20	−1.26^***	0.12	−1.52^***	0.14
AFS_H (day)	0.44^***	0.14	0.33^***	0.08	0.35^***	0.09
NS_H^c	0.96^***	0.32	0.78^***	0.19	0.99^***	0.22
NRR_H^c	−0.01	0.16	−0.14	0.09	−0.19^*	0.11
FSTC_H (day)	0.29^**	0.12	0.24^***	0.07	0.31^***	0.08
CTFS_C (day)	0.07	0.09	0.04	0.05	0.02	0.06
NS_C^c	0.45	0.51	0.83^***	0.29	0.70^**	0.34
NRR_C^c	−0.29	0.23	−0.34^**	0.14	−0.33^**	0.16
FSTC_C (day)	0.16	0.21	0.19	0.12	0.19	0.14

^***P < 0.01; ^**P < 0.05; ^*P < 0.1
^aMY milk yield, FY fat yield, PY protein yield, AFS_H age at first service for heifers, NS_H number of service for heifers, NRR_H 56-day non-return rate for heifers, FSTC_H first service to conception for heifers, CTFS_C conception to first service for cows, NS_C number of service for cows, NRR_C 56-day non-return rate for cows, FSTC_C first service to conception for cows
^bF_PED = pedigree inbreeding; F_ROH = segment-based genomic inbreeding; F_GRM = marker-by-marker-based genomic inbreeding
^cTrait estimates and SE were multiplied by 100

ISSN: 1471-2164