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Table 3 Summary data from Romney and Perendale selection lines[6, 7]

From: Signatures of selection in sheep bred for resistance or susceptibility to gastrointestinal nematodes

Trait Romney Perendale
  High Low High Low
Average yearly flock size (rams/ewes) 6/100 4.6/50
Divergence of log-transformed FEC between lines 2.73 0.85
Divergence in average BVs between lines 2.83 1.77
Fold-difference in FEC mean between lines 11.3 4.9
Heritability 0.28 ± 0.02 0.18 ± 0.03
Back-transformed FEC means (eggs/g) 3823 339 556 114