Table 1.

Survival rates within full-sib families

	All familiesa	Genotyped familiesb
Mean ± SD	0.46 ± 0.18	0.45 ± 0.14
Maximum	0.87	0.78
Minimum	0.03	0.18

^aAll families that were in the challenge test

^bThe families that were used for QTL mapping