Table 3.

Correlations^a between performances of a trait in different parities using a multi-trait model

Traitb	IFL	CR	AIS	NRR56	ICF	DO
$r_{a_0,a_1}$	0.64 (0.09)	0.45(0.15)	0.48(0.11)	0.65(0.18)
$r_{a_0,a_2}$	0.49 (0.12)	0.52(0.18)	0.40(0.13)	0.74(0.22)
$r_{a_0,a_3}$	0.61 (0.14)	0.25(0.22)	0.55(0.14)	0.37(0.23)
$r_{a_1,a_2}$	0.89 (0.06)	1.00(0.11)	0.92(0.06)	0.99(0.24)	0.91(0.03)	0.89(0.05)
$r_{a_1,a_3}$	0.93 (0.08)	0.66(0.19)	0.92(0.08)	0.92(0.23)	0.92(0.04)	0.96(0.05)
$r_{a_2,a_3}$	0.94 (0.07)	0.63(0.21)	0.94(0.07)	0.87(0.24)	0.96(0.04)	0.96(0.05)
$r_{e_0,e_1}$	0.06 (0.01)	0.03(0.004)	0.07(0.005)	0.004(0.004)
$r_{e_0,e_2}$	0.04 (0.01)	0.01(0.01)	0.05(0.01)	−0.002(0.005)
$r_{e_0,e_3}$	0.04 (0.01)	0.01(0.01)	0.05(0.01)	0.01(0.01)
$r_{e_1,e_2}$	0.09 (0.01)	0.02(0.01)	0.09(0.01)	0.02(0.01)	0.05(0.01)	0.12(0.01)
$r_{e_1,e_3}$	0.07 (0.01)	0.02(0.01)	0.08(0.01)	0.02(0.01)	0.01(0.01)	0.08(0.01)
$r_{e_2,e_3}$	0.11 (0.01)	0.04(0.01)	0.13(0.01)	0.03(0.01)	0.07(0.01)	0.14(0.01)

^a $r_{a_i,a_j}$ = genetic correlation between performances of a trait in parities i and j, $r_{e_i,e_j}$ = residual correlation between performances of a trait in parities i and j. Phenotypic correlations were similar to residual correlations (not presented)

^b IFL interval from first to last insemination, CR conception rate at first insemination, AIS number of inseminations per conception, NRR56 non-return rate at 56 days after first insemination, ICF interval from calving to first insemination, DO days open