In a Swedish testing program where nearly every German shepherd passes through a set of unsettling and playful encounters, researchers have found that the dogs bred for work carry a different temperament than those bred for appearance. The difference shows up in behavior and, faintly, in the genome, reminding us that the traits humans select for in animals often echo back into our own understanding of nerves and curiosity. The work is a first step: it names a divide that breeders and militaries have long sensed, but it does not yet tell anyone which puppy to choose.
German Shepherd Genes Point to Curiosity and Fearlessness Differences Between Working and Show Lines
Working-bred shepherds showed less fear and more curiosity, in behavior and in genes
Mark
So what did the researchers actually find?
Mimi
That Swedish German shepherds split into two groups, show-bred and working-bred, and the working-bred ones showed less fear and more curiosity on average in a standardized test.
Mark
How big was the data?
Mimi
Behavior data from around 23,000 dogs. The genetic part was much smaller: blood samples from 373 dogs that had taken the test.
Luke
That gap matters. The behavior finding rests on a big sample, but the gene links come from 373 dogs. That's a first step, and the researchers say so themselves.
Mark
And the human connection?
Mimi
Some of the genes linked to behavior in these dogs have been associated with neuroticism in people in earlier studies.
Luke
Associated is the key word. The source says nothing about shared mechanisms, and the benefit for human research is described as long-term and hopeful.
Mark
Could this be used in breeding now?
Mimi
Not yet. Hedhammar said plainly that they aren't there. The plan is bigger studies with the Swedish Armed Forces.
Luke
Right, and the source doesn't give the number of genes, their names, or the size of the effects. So we know direction, not magnitude.
Der Puls
- A standardized test that mixes a ghostly figure, a stranger's touch, and an invitation to play is quietly sorting thousands of Swedish shepherds by how they react.
- Show-bred and working-bred dogs turn out to be two distinct populations, with working dogs showing less fear and more curiosity.
- Blood samples from 373 dogs point to genome regions tied to curiosity and playfulness, some also linked to neuroticism in humans.
- Researchers are racing to map behavioral genetics further with the Swedish Armed Forces, yet they warn that breeding decisions remain out of reach for now.
In a Swedish testing program where nearly every German shepherd passes through a set of unsettling and playful encounters, researchers have found that the dogs bred for work carry a different temperament than those bred for appearance. The difference shows up in behavior and, faintly, in the genome, reminding us that the traits humans select for in animals often echo back into our own understanding of nerves and curiosity. The work is a first step: it names a divide that breeders and militaries have long sensed, but it does not yet tell anyone which puppy to choose.
In Sweden, most German shepherds go through the Dog Mentality Assessment, a standardized test in which a dog meets a ghost-like figure, a stranger who wants to handle it, and a person inviting it to play. Researchers at Uppsala University and the Swedish University of Agricultural Sciences have used data from around 23,000 of these dogs to show that the population splits into two groups: those bred mainly for appearance and those bred for working roles. The working-bred dogs were less fearful and more curious, and they socialized well with people.
The question carries weight because police and defense forces depend on temperament, and choosing the right breeding dogs is costly and difficult. Åke Hedhammar of the Swedish University of Agricultural Sciences argued that behavior must be part of breeding choices for functional roles in society. To look deeper, the team sampled blood from 373 dogs and found genome regions that track with curiosity and playfulness, some of which have also been associated with neuroticism in humans.
Kerstin Lindblad-Toh, one of the study's leaders, noted that behavior in the dogs is shaped by many genes working together, and that several genes influence behavior in both species. Larger studies with the Swedish Armed Forces are planned. Hedhammar was cautious, calling the work a first step that establishes clear behavioral differences but does not yet guide breeding.
In Sweden, a dog is likely to meet a figure that looks like a ghost, a stranger who wants to handle it, and a person inviting it to play, all in one standardized test. The test is called the Dog Mentality Assessment, or DMA, and most German shepherds in the country now go through it. Researchers at Uppsala University and the Swedish University of Agricultural Sciences have used the results to show that the behavioral gap between working and show German shepherds is also visible in the dogs' DNA.
The study, published in the journal Animal Genetics, draws on DMA data from around 23,000 German shepherds. The Swedish population turns out to consist of two groups: one bred mainly for appearance, the other bred for functional roles as working dogs. On average, the working-bred dogs showed less fear and more curiosity, and they socialized well with humans. In the researchers' summary, working-bred shepherds are more curious and less neurotic than show-bred ones.
The question matters because German shepherds serve in police forces and defense forces, where temperament counts for a great deal. Breeding dogs with the right traits can be difficult and costly. Åke Hedhammar, professor emeritus at the Swedish University of Agricultural Sciences, said the findings show how important it is to select for behavior when choosing dogs for breeding for important functional roles in society.
To look at genes, the team took blood samples from 373 shepherds that had completed the DMA and mapped their genomes. They found regions of the genome where differences tracked with traits such as curiosity and playfulness. That allowed them to identify some genes in working dogs linked to those traits. Kerstin Lindblad-Toh, professor of comparative genomics at Uppsala University and one of the study's leaders, described how working-dog breeders have picked and bred animals that really enjoy working, for whom it is something like a game. The study, she said, shows that this selection has produced differences at both the behavioral and genetic levels.
There is a link to people as well. Some of the genes tied to behavior in these shepherds have previously been associated with neuroticism in humans. Lindblad-Toh said it is interesting that several of the identified genes influence behavior in both species, and suggested that in the long term dogs could help researchers learn more about different behaviors in people.
The researchers stress that behavior is not governed by single genes but by a complex interaction among many. Together with the Swedish Armed Forces, they plan larger studies to map the genetics of behavior in more detail. The eventual goal would be to use the findings to decide which dogs are most likely to become good working dogs and which should be used in breeding.
Hedhammar was careful about how far the work has come. The research is not at that point yet, he said. It is a first step, and what it establishes is that there are clear behavioral differences between working German shepherds and show German shepherds. The larger military-backed studies are the next thing to watch.
Bemerkenswerte Zitate
The findings could eventually help select which dogs make good working dogs and breeding candidates, but the research is not there yet; this is a first step.— Åke Hedhammar, professor emeritus, Swedish University of Agricultural Sciences
Several genes identified as influencing behavior in German shepherds are also linked to that behavior in humans.— Kerstin Lindblad-Toh, professor of comparative genomics, Uppsala University
Möchten Sie die ganze Geschichte?
Das Original lesen bei Phys.org ↗