Table 1.
Characteristics of the simulated pBLUP and genomic breeding scenarios
| |
Breeding scenarios1 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| BL_ref | BL_30% | BL_50% | BL_70% | BL_90% | GE_ref | GE_80% | GE_60% | GE_40% | GE_20% | |
| Proportion of litters with 3 female candidates (pLF) |
90% |
90% |
90% |
90% |
90% |
90% |
73% |
53% |
37% |
17% |
| Nb of litters with female candidates/herd*batch (nLF) |
27 |
27 |
27 |
27 |
27 |
27 |
22 |
16 |
11 |
5 |
| Total annual2 nb of female candidates, all herds together (nFC) |
7290 |
7290 |
7290 |
7290 |
7290 |
7290 |
5940 |
4320 |
2970 |
1350 |
| Proportion of litters with 3 male candidates (pLM) |
80% |
80% |
80% |
80% |
80% |
80% |
63% |
47% |
33% |
17% |
| Nb of litters with male candidates/herd*batch (nLM) |
24 |
24 |
24 |
24 |
24 |
24 |
19 |
14 |
10 |
5 |
| Total annual2 nb of male candidates, all herds together (nMC) |
6480 |
6480 |
6480 |
6480 |
6480 |
6480 |
5130 |
3780 |
2700 |
1350 |
| Proportion of litters with 1 phenotyped sib (pLS) |
10% |
30% |
50% |
70% |
90% |
10% |
10% |
10% |
10% |
10% |
| Nb of litters with 1 phenotyped sib/herd*batch (nLS) |
3 |
9 |
15 |
21 |
27 |
3 |
3 |
3 |
3 |
3 |
| Total annual2 nb of phenotyped sibs, all herds together (nPS) |
270 |
810 |
1350 |
1890 |
2430 |
270 |
270 |
270 |
270 |
270 |
| Initial size of the training population for trait 1 (at year 6) (S1
0
) |
not relevant |
13 770 |
10 710 |
8415 |
5355 |
3060 |
||||
| Nb of time steps to constitute the initial training population for trait 1 |
18 |
14 |
11 |
7 |
4 |
|||||
| Annual2 increase in size of the training population for trait 1 |
13 770 |
11 070 |
8100 |
5670 |
2700 |
|||||
| Initial size of the training population for trait 2 (at year 6) (S2
0
) |
not relevant | 1000 |
1000 |
1000 |
1000 |
1000 |
||||
| Nb of time steps to constitute the initial training population for trait 2 |
67 |
67 |
67 |
67 |
67 |
|||||
| Annual2 increase in size of the training population for trait 2 | 270 | 270 | 270 | 270 | 270 | |||||
1BL_ref, BL_30%, BL_50%, BL_70%, BL_90% = breeding schemes based on traditional pBLUP genetic evaluations using phenotypes of the candidates for trait 1 and phenotypes of sibs for trait 2 sampled in 10%, 30%, 50%, 70% or 90% of the litters, respectively; GE_ref = breeding scheme based on genomic evaluations with annual numbers of candidates and phenotyped sibs identical to BL_ref scenario; GE_80%, GE_60%, GE_40%, GE_20% = breeding schemes based on genomic evaluations with initial training population for trait 1 and annual number of candidates reduced by 20%, 40%, 60% and 80%, respectively, compared to the GE_ref scenario; 2the actual period of time corresponds to 18TS, i.e. 378 days, assimilated for simplicity to one year.