Tests

Projected Height Test

Confidently predict the expected mature height at withers of a young foal and breed more horses of the desired height within one season of testing.


Mature height at withers can be predicted within 2.54cm (1 inch) with a 70% success rate from birth, based on DNA analysis of the LCORL/NCAPG gene region and the sex of the horse.

At the LCORL/NCAPG gene region, a position in the DNA code contains either the DNA variant G or A. Each individual has two copies of the gene – one inherited from the dam and one from the sire, so there are three possible genetic combinations: A:A, G:A or G:G.

 

Females
Genetic Type
(LCORL/NCAPG gene region)
Physical
Type
Mature Height At Withers
+/-2.54cm
Breeding Implications
A:A Small 161.08cm (approx. 15.3hh) Can only produce small or medium-height horses
G:A Medium 163.44cm (approx. 16.0hh) Can produce small, medium or tall-height horses
G:G Tall 168.28cm (approx. 16.2hh) Can only produce medium or tall-height horses
Males
Genetic Type
(LCORL/NCAPG gene region)
Physical
Type
Mature Height At Withers
+/-2.54cm
Breeding Implications
A:A Small 162.8cm (approx. 16.0hh) Can only produce small or medium-height horses
G:A Medium 165.14cm (approx. 16.1hh) Can produce small, medium or tall-height horses
G:G Tall 168.28cm (approx. 16.2hh) Can only produce medium or tall-height horses
Use of Information

Selection: Identify horses that are 70% likely to be within the specific height range desired by the owner.

Breeders: Produce horses of a desired height more consistently. If the genetic types of the stallion and mare are known, the potential outcomes can be predicted as per the table below.

Genetic Type Cannot be Determined from Pedigree.

The stallion and mare each pass on one copy of their DNA variant (i.e. 'G' or 'A') to the foal. A G:A horse is equally likely to pass on a 'G' or 'A'. Therefore, a G:A mare bred to a G:A stallion can produce either a A:A, a G:A or a G:G foal (see table).

This explains why full siblings can be completely different heights, and why projected height cannot be reliably determined from pedigree alone.

The potential outcomes from any breeding combination can be predicted if the genetic type of the stallion and mare are known, as shown in this table. This test can be used to complement other selection tools to shortlist stallions and mares most likely to produce the desired result.

Pricing
Projected Height Test €100 £85 AUS $125 US $125

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Plusvital is able to accept DNA samples from almost all bloodstock regions within the world. The process is simple and involves a 4-5ml uncoagulated blood sample from each horse in a purple cap K2-EDTA tube. If you require any assistance or advice, please contact us directly.

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