Table 6.
Summary of the two-trait analyses with a pleiotropic QTL model affecting both CM and SCS vs. the two-linked QTL model, each affecting one trait.
| Pleiotropic QTL |
Two-linked QTL |
||||||||
|---|---|---|---|---|---|---|---|---|---|
| LA |
LDLA |
LA |
LDLA |
||||||
| Breed | QTL position (cM) | LRT | QTL position (cM) | LRT11 | CM QTL (cM) | SCS QTL (cM) | LRT11 | SCS QTL when CM QTL fixed at 74.1 cM | LRT22 |
| DR | 3.7 | 8.1 | 69.1 | 10.6 | 95.1 | 3.7 | 7.2 | Did not converge | – |
| FA | 34.7 | 4.6 | 48.7 | 6.5 | 71.7 | 37.5 | 5.5 | 72.2 | 0.15 |
| SRB | 73.1 | 12.4 | 77.2 | 11.6 | 70.4 | 73.5 | 10.2 | 74.1 | 4.37 |
| DR + FA + SRB | 72.2 | 14.1 | 74.4 | 19.7** | 79.7 | 95.1 | 14.1 | 74.1 | 5.1 |
LRT, likelihood ratio test.
1
Likelihoods were compared with a hypothesis of no QTL.
2
Likelihoods were compared with the clinical mastitis QTL fixed at 74.1 cM, and the search for SCS QTL was restricted to between 59 and 80 cM on BTA9.
**
P<0.01.