View Full Table | Close Full ViewTable 1.

Number of farms, year-week, and sows (litters)1

 
Breed Farms Year-week Sows (Litters)
Landrace 19 84 42,807
Yorkshire 20 84 33,225
1Only first parity was considered.



View Full Table | Close Full ViewTable 2.

Total number of litters, mean and SD within years for total number born (TNB), piglet mortality (including stillborn and number of dead piglets until d 5 after farrowing), and litter size at d 5 after farrowing (LS5)

 
Item No. of litters Mean SD
Landrace
    TNB 42,807 13.7 3.9
    Mortality 42,807 0.18 0.18
    LS5 42,807 11.1 3.6
Yorkshire
    TNB 33,225 13.5 3.7
    Mortality 33,225 0.20 0.20
    LS5 33,225 10.8 3.7



View Full Table | Close Full ViewTable 3.

Covariance matrices of herd-year-week effect, maternal genetic effect, and residuals related to the total number born (TNB), piglet mortality including stillborn (MORT), and litter size at d 5 (LS5) in Landrace and Yorkshire1

 
(Co)variances and SE
Variance component Trait TNB MORT LS5
Landrace
    Herd-year-week effect TNB 0.17 (0.03) 0.003 (0.001) 0.09 (0.02)
MORT 0.001 (0.0001) −0.01 (0.001)
LS5 0.15 (0.02)
    Genetic, sow TNB 1.48 (0.13) 0.017 (0.004) 0.93 (0.10)
MORT 0.003 (0.0002) −0.02 (0.004)
LS5 1.07 (0.10)
    Residual TNB 13.19 (0.13) 0.072 (0.004) 9.41 (0.10)
MORT 0.027 (0.0002) −0.26 (0.004)
LS5 11.11 (0.10)
Yorkshire
    Herd-year-week effect TNB 0.25 (0.03) 0.002 (0.001) 0.15 (0.03)
MORT 0.001 (0.0001) −0.01 (0.002)
LS5 0.25 (0.03)
    Genetic, sow TNB 1.65 (0.15) 0.018 (0.006) 1.01 (0.12)
MORT 0.004 (0.0004) −0.04 (0.006)
LS5 1.34 (0.14)
    Residual TNB 11.86 (0.14) 0.050 (0.005) 8.48 (0.12)
MORT 0.035 (0.0004) −0.38 (0.006)
LS5 11.89 (0.13)
1Asymptotic SE are shown in brackets.



View Full Table | Close Full ViewTable 4.

Heritability (on the diagonal), phenotypic correlation (below the diagonal), and genetic correlation (above the diagonal) for total number born (TNB), piglet mortality including stillborn (MORT), and litter size at d 5 (LS5) in Landrace and Yorkshire1

 
Landrace Yorkshire
Item TNB MORT LS5 TNB MORT LS5
TNB 0.10 (0.008) 0.28 (0.06) 0.74 (0.03) 0.12 (0.01) 0.22 (0.07) 0.68 (0.04)
MORT 0.14 (0.005) 0.09 (0.008) −0.43 (0.05) 0.09 (0.06) 0.10 (0.01) −0.57 (0.05)
LS5 0.77 (0.002) −0.47 (0.004) 0.09 (0.008) 0.71 (0.003) −0.59 (0.004) 0.10 (0.01)
1Approximated SE are given in parentheses.