Table 1.

Simulation scenarios

Parameter	Basic parameter values	Alternative parameter values
N, nsires, ndamspersire, noffspring per sire/dam	10,000, 200, 50, 1	–
tgenerations of selection per replicate, nreplicates	20, 50	–
Genetic variance for susceptibility in baseline population $\left({\mathit{\sigma }}_{\mathit{Ag}}^2\right)$	0.5	0.2
Genetic variance for infectivity in baseline population $\left({\mathit{\sigma }}_{\mathit{Af}}^2\right)$	0.5	0.2
Environmental variance for susceptibility $\left({\mathit{\sigma }}_{\mathit{Eg}}^2\right)$	2	0.8
Environmental variance for infectivity $\left({\mathit{\sigma }}_{\mathit{Ef}}^2\right)$	2	0.8
Average effective contact rate (β)	0.02	–
Recovery rate (γ)	0.017
Selection accuracy for susceptibility (rg)	0.7	NA, 0.7
Selection accuracy for infectivity (rf)	NA	0.7, 0.5, 0.4, 0.3, 0.2
Selected proportions of sires for susceptibility	0.5	NA, 0.5
Selected proportions of sires for infectivity	NA	0.5, 0.8
Selected proportions of dams for susceptibility	1	–
Selected proportions of dams for infectivity	1	–
Contemporary group size	100	20

Basic and alternative parameter values assumed in the simulation scenarios. NA corresponds to selection only on susceptibility or only on infectivity