The Thoroughbred Link employs female families as strains.
History tells us the Bedouins tracked horse ancestry through the maternal/females lines and not by paternal.
The family-strain carried characteristics or ‘traits’.
Whilst speed is the aim – sire & mare should be complementary ‘dominant’: to carry stability of breeding through the cycles of genetic regeneration.
Much depends on family breeding generational cycles over the generational phrases upgrading (or downgrading).
The phenotype (physique) shall ‘work’ from genotype pedigree, the inheritance.
Is there efficiency and economical ‘physics’ of the animal i.e. the way it walks or holds its ‘presence’ through the eye. ie. its phenotype
Put it all together as it equates ‘balance’ and a presence that conveys the unique individual.
Always search the ‘strength’ & bone, strong shoulder, length of croup and good length of hip with a good head and eye to match. These hand-in-hand are the intelligence, agility and impulsion to gallop.