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Livestock Cropping & Pasture General Farm

If a trait is lowly heritable, does that mean that it cannot be improved genetically?

Traits with a low degree of heritability can still be improved genetically, though not as rapidly as more highly heritable traits. The rate of genetic progress is not controlled by heritability alone; the amount of observable (phenotypic) variation and the accuracy with which the variation can be identified are also key factors.