21-week (Scan weight) EBV

This is a measure of the animal’s genetic potential for growth from birth to 21 weeks of age (age at scanning). Selection for high scan weights results in animals that will have heavier carcases at a constant fat class or leaner carcases at a constant age.

A ram with an EBV of +4 for scan weight is expected to produce, on average, lambs
2 kg heavier at 21 weeks than lambs sired by a ram with an EBV for this trait of 0.