Everyone wants the best bloodlines. The best bloodlines have helped shape the modern Connemara. But what happens when success starts narrowing the choices left behind?
There are certain names in Connemara pedigrees that make people stop scrolling.
You know the ones.
They appear in successful ponies, in sale adverts, in stallion catalogues, in breeding plans. They have produced jumpers, show winners, performance ponies and breeding stock. Their popularity did not come from nowhere.
And that is exactly the point.
The most successful bloodlines are supposed to spread.
But there is a difference between a bloodline becoming influential and a breed becoming dependent on it.
And somewhere between those two things sits a question that is much more interesting than simply asking whether the modern Connemara is “too inbred”.
Are we gradually reducing our own choices?
The problem is not that the popular bloodlines are bad
Quite the opposite.
If a stallion consistently produces quality, breeders use him.
If his offspring perform, buyers start recognising the name.
If his daughters breed well, they are retained.
If his sons prove themselves, they breed too.
Success compounds.
One good stallion can end up appearing in pedigrees from several different directions within surprisingly few generations.
Nobody has necessarily done anything wrong.
Every individual decision may have been perfectly sensible.
That is what makes the problem interesting.
A breed does not have to make one disastrous breeding decision to lose diversity. It can get there through thousands of perfectly reasonable ones.
A big population can still have a small gene pool
This is the bit that is easy to miss.
The Connemara is not a tiny endangered breed with a handful of animals left. The official CPBS database contains tens of thousands of ponies and pedigrees extending back up to six generations.
That sounds reassuring.
But the number of ponies alive is not the same thing as the number of genetically different breeding choices available.
Imagine 1,000 ponies, but a very large proportion of them trace back repeatedly to the same few influential animals.
You still have 1,000 ponies.
You do not necessarily have 1,000 different genetic options.
That distinction is important.
And there is evidence that it matters in Connemaras.
A 2023 genomic study compared Connemaras with Warmbloods and found that, although the Connemaras studied were slightly less inbred overall, there were signs of more recent inbreeding. The researchers also found that the influence of popular sires in the Connemara sample was similar to that seen in Warmblood populations. They described the findings as an early warning that maintaining genetic variation deserves attention.
It was a relatively small sample — 36 Connemaras, mostly from the UK — so it would be wrong to pretend it describes every Connemara population everywhere.
But it is enough to make the conversation worth having.
What does “breeding into a corner” actually look like?
Not necessarily a dramatic spike in genetic disease.
Not necessarily obviously weak ponies.
And certainly not one particular stallion being blamed for everything.
It can look much more ordinary.
You have a mare.
You start looking for stallions.
Stallion A carries a particular influential ancestor.
Stallion B looks like an outcross, until you go back another generation and find the same line.
Stallion C carries it twice through two different branches.
Stallion D looks different again, but his dam line brings it back in.
Suddenly the choice is not between four genuinely different pedigrees.
It is four different versions of a similar genetic conversation.
That is the corner.
Not that you cannot breed.
That your room to manoeuvre becomes smaller.
The first consequence is simple: fewer options
This is probably the most important consequence because everything else follows from it.
Genetic diversity is really another word for choice.
Choice when you want to correct a weakness.
Choice when you want to change type.
Choice when a new health problem appears.
Choice when the market changes.
Choice when a particular line becomes too concentrated.
Choice when breeders twenty years from now decide they want something we stopped valuing today.
Lose enough diversity and those choices disappear.
And once a bloodline is gone, you cannot simply order it back.
Then there is the less comfortable part: recessive disease
Every population carries harmful recessive variants.
Most of the time they remain invisible because an affected foal only appears when two copies meet.
The more closely related a population becomes, the greater the chance that the same recessive variants will meet.
HWSD is the obvious Connemara example, but it also teaches an important lesson.
The answer has never been to remove every HWSD carrier from breeding.
In fact, the genetics paper specifically notes concerns that excluding all carriers could itself reduce genetic diversity. The sensible approach is to know the status and avoid carrier-to-carrier matings.
That tells us something much bigger.
Good genetic management is not about chasing genetic purity. It is about preserving useful genes while managing risk intelligently.
That is a very different mindset.
Inbreeding depression is not just a theory
There is also the broader biological issue of inbreeding depression.
Across livestock species, large reviews have found that increasing inbreeding is associated with poorer average performance across a range of traits, including health, reproduction, growth and conformation-related measures. One major meta-analysis covering 154 studies found an overall unfavourable relationship between rising inbreeding and phenotypic performance.
That does not mean a linebred Connemara will automatically be unhealthy.
It does not mean a close pedigree equals a bad pony.
It means that, at population level, repeatedly increasing homozygosity carries consequences.
And those consequences are often boring before they are dramatic.
Slightly poorer fertility.
Slightly less robustness.
Slightly more health problems.
Slightly less ability to adapt.
Nothing that necessarily sets off an alarm in one foal.
But breeding populations are shaped by averages accumulated over generations.
We may also be selecting away things we do not measure
This is the part I find more interesting than the numbers.
What exactly are we selecting for when we choose the fashionable bloodlines?
Performance.
Height.
Movement.
Jump.
Type.
Marketability.
All reasonable things.
But breeding is never only about what you select for.
It is also about what you accidentally stop selecting for.
Perhaps an old mare line produces ponies with exceptionally good feet.
But they are not especially flashy.
Perhaps another line consistently produces hardy ponies that stay sound into their twenties.
But they are 14hh rather than 15hh.
Perhaps a stallion produces fantastic temperaments, but his progeny do not have the movement currently rewarded in the show ring.
Perhaps a family is fertile, tough and easy to manage, but nobody is putting their name in capital letters in sale adverts.
Those traits can disappear without anybody making a conscious decision to lose them.
That is how genetic erosion often works.
Not with a bang.
With indifference.
The market has more influence than we like to admit
Breeders do not make decisions in a vacuum.
They breed ponies that people will buy.
And buyers like names they recognise.
A pedigree containing fashionable performance blood can make a pony easier to advertise, easier to explain and sometimes easier to sell.
That creates a feedback loop.
The bloodline is popular because it has produced good ponies.
Buyers seek it.
Breeders use it because buyers seek it.
More successful offspring appear carrying it.
Buyers become even more familiar with the name.
The line becomes more commercially attractive.
And before long, the market is helping to decide which genetics multiply.
Again, none of this means the bloodline is undeserving.
But it does raise an uncomfortable question:
Are we always choosing the best mating for the mare, or sometimes the pedigree most likely to appeal to the buyer?
Those may often be the same thing.
They are not always.
The mare side deserves more attention
Stallions naturally dominate pedigree conversations because one stallion can produce vastly more offspring than one mare.
That makes sire influence easy to see.
It also makes mare families easier to overlook.
And that may be a mistake.
A mare line can carry generations of traits that do not necessarily show up in a flashy advert:
Soundness.
Fertility.
Temperament.
Bone.
Longevity.
Feet.
Hardiness.
The ability to consistently produce useful ponies.
These female families may be some of the most important reservoirs of variation left in the breed.
But they are also vulnerable because a mare produces comparatively few offspring.
Lose a stallion line and there may be dozens of sons and daughters carrying it.
Lose an old mare family and it can disappear much more quietly.
“But linebreeding has always been used”
Absolutely.
Deliberate linebreeding is not the same thing as blindly avoiding any repeated ancestor.
Breeders have used linebreeding for generations to reinforce desirable traits.
That is not automatically bad breeding.
The difference is whether it is deliberate.
If you choose to concentrate an exceptional ancestor because you understand the pedigree and want to reinforce certain qualities, that is a strategy.
If the same ancestors simply keep appearing because nearly every fashionable option leads back to them anyway, that is something else.
One is a choice.
The other is the gradual loss of choice.
The CPBS advice is actually quite telling
The current CPBS breeding programme says breeders should consider at least three ancestral generations on both the sire and dam sides before common parentage appears. It also states that the aim of the programme is to both preserve and improve the breed.
Those two words — preserve and improve — sit in tension with each other.
Improvement pushes breeders towards the most successful animals.
Preservation asks them not to lose everything else in the process.
Both matter.
And neither is particularly easy.
Perhaps “rare” deserves a second look
Rare blood is not automatically good blood.
An unfashionable pedigree is not valuable simply because nobody else has it.
Breeding standards still matter.
Conformation matters.
Temperament matters.
Performance matters.
Soundness matters.
But perhaps a genuinely good pony from a less common family deserves slightly more attention than it currently gets.
Not as a museum piece.
As an option.
Because genetic difference only becomes valuable after you have lost enough of it.
And by then it is rather late.
What would the actual worst-case scenario be?
Not that every Connemara suddenly becomes unhealthy.
Something much less dramatic.
Future breeders open the pedigree database and discover that the stallions they like are all related more closely than they would ideally want.
A recessive condition appears and avoiding it removes a large chunk of the remaining breeding population.
A desirable trait becomes rarer and there are fewer unrelated families left carrying it.
Fertility or robustness slowly declines at population level.
A change in sport or buyer demand makes breeders want a different type of Connemara, but the genetics that produced it have largely disappeared.
That is what breeding into a corner means.
You can still move. There are simply fewer directions left.
And this is why the popular bloodlines are not the enemy
It would be completely backwards to take from this that breeders should stop using successful stallions.
Great bloodlines have improved the Connemara enormously.
The breed’s international reputation as a performance pony did not happen by accident.
But the very success of those lines is why they deserve careful management.
A mediocre stallion will never reshape a breed.
A brilliant one can.
And perhaps that is the irony.
The bloodlines most worth preserving are also the ones capable of becoming so successful that they squeeze out the alternatives.
We now have enough information to be smarter about it
The CPBS database gives breeders up to six generations of verified pedigree, progeny information and even hypothetical mating tools.
So this is no longer a case of breeding blind.
We can look deeper.
We can see how often an ancestor appears.
We can look at dam lines.
We can deliberately seek a different route when the pedigree is getting crowded.
We can use genetic testing without throwing valuable carriers out of the population.
We can value successful bloodlines without treating them as the only bloodlines worth having.
And perhaps most importantly, we can stop thinking only about the foal in front of us.
Because this is really about the breeder who comes next
Every generation of breeders inherits the choices made by the one before.
We benefit today from people who preserved lines that may not have seemed particularly fashionable at the time.
The breeders who come after us will inherit whatever we decide is worth multiplying now.
That is why this is bigger than an argument about inbreeding percentages.
It is about leaving them options.
The ability to go taller.
Or smaller.
More traditional.
More athletic.
Different blood.
Different families.
Different answers.
Because a breed with plenty of ponies but very few genuinely different choices is not as genetically secure as it looks.
So perhaps the question is not:
Are we using the popular bloodlines too much?
Perhaps it is:
While we are busy multiplying everything we know works, who is making sure we do not lose everything else?
And one day, that may matter far more than which name was fashionable in the pedigree this year.