Genome-wide assessment and mapping of inbreeding depression identifies candidate genes associated with semen traits in Holstein bulls

Table 1 Descriptive statistics and the estimated heritability (h²) and repeatability (r) of the three semen quality traits

Trait (unit)	N ^a	Mean (SD)	Min	Max	h² ± SE ^b	r ± SE ^b
Ejaculate volume	332,531	6.76 (2.97)	1	25	0.13 ± 0.02	0.28 ± 0.01
Sperm concentration	330,270	12.67 (4.61)	1	30	0.11 ± 0.02	0.32 ± 0.01
Sperm motility	330,199	0.67 (0.16)	0.1	0.98	0.08 ± 0.02	0.28 ± 0.01

^a Number of records
^b \({h}^{2}=\frac{{\upsigma }_{\mathrm{a}}^{2}}{{\upsigma }_{\mathrm{a}}^{2}+{\upsigma }_{\mathrm{pe}}^{2}+{\upsigma }_{\mathrm{e}}^{2}}\), and \(r=\frac{{\upsigma }_{\mathrm{a}}^{2}+{\upsigma }_{\mathrm{pe}}^{2}}{{\upsigma }_{\mathrm{a}}^{2}+{\upsigma }_{\mathrm{pe}}^{2}+{\upsigma }_{\mathrm{e}}^{2}}\); where \({\upsigma }_{\mathrm{a}}^{2}\) is additive genetic variance, \({\upsigma }_{\mathrm{pe}}^{2}\) is permanent environment variance, and \({\upsigma }_{\mathrm{e}}^{2}\) is residual variance

ISSN: 1471-2164