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Essential Information | Why Is My Mouse Balding?

Introduction:

Many people encounter hair loss in laboratory mice when raising or purchasing them, with symptoms ranging from mild to severe.

In fact, hair loss is not limited to aged mice; it also occurs in experimental mice of relatively young age.

So, how serious is hair loss in laboratory mice? What exactly causes it? Today, we’ll address these questions one by one.

 

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Reason One: Grooming Habits

Rats naturally engage in grooming, which also serves as a form of social interaction. This behavior can lead to hair loss on areas such as the whiskers and the back. According to caretakers’ observations, female rats tend to experience more extensive hair loss than males.

 

If the skin exposed after grooming in laboratory mice shows no scabbing or erythema, their fur will regrow over time (following transfer to separate cages). If there are skin lesions, the wounds can be treated with iodine.

Tip: Placing shredded paper, toys, and other items inside the cage can help reduce grooming issues in laboratory mice.

 

 
Reason Two: Fighting

Like many social animals, rats also exhibit a hierarchical structure within their groups. Dominant male rats establish and maintain their rank through aggressive encounters.

Rats with higher social ranks exhibit intact fur, whereas those with lower ranks show hair loss on their backs and necks. Mild fighting results in localized, patchy hair loss without skin damage; severe aggression leads to skin lesions and may even cause mortality.

Tip: Strains like C57 and C3H mice are particularly prone to biting the fur on their faces and whiskers during fights; the commonly used C57 strain may also gnaw at the fur on their necks and backs.

 

 

 
Reason Three: Infection and Disease

In addition to fighting, fungal and parasitic infections can also cause hair loss in laboratory mice.

If you notice ulcers or redness and swelling on your pet’s skin, it’s advisable to have a fungal culture performed or to collect a sample of the affected fur for microscopic examination to check for parasites. If any abnormalities are detected, address them promptly—consulting a veterinarian is recommended.

In addition, drug‑induced conditions or transplanted tumors may also lead to hair loss in laboratory mice.

 

 

Reason Four: Environment and Hormones

Raising laboratory mice requires careful attention to temperature and humidity in their housing environment. Low humidity can cause the mice’s skin to dry out and produce dander, leading to hair loss; high temperatures, on the other hand, result in thinning fur in both adult and juvenile mice.

Environmental noise also affects laboratory mice. When the housing environment is noisy or otherwise stimulating—such as bright lighting, frequent human traffic, or the repeated handling of mice for experimental procedures—the animals exhibit stress responses, accompanied by a surge in adrenaline secretion. Excessive adrenaline can, in turn, lead to hair loss.

Mechanical friction can also induce hair loss; in experimental rats, repeated rubbing of the limbs against the cage bars during feeding leads to mild alopecia at the sites of contact.

 

 
Reason Five: Genetics

In some strains of laboratory mice, hair loss is genetically determined—for example, in the commonly used C57BL/6 mouse. Studies have reported that C57 mice exhibit an incomplete hair follicle architecture. According to caretakers’ observations, naturally aging C57 mice typically begin losing fur near the rump, with the shedding gradually spreading to extensive areas across the entire back.

In addition to C57 mice, certain genetically engineered mouse strains also exhibit hair loss, such as mice with mutations in the HR gene.

 

 
Reason Six: Nutrition

When the nutrients and trace elements in the feed fail to meet the experimental mice’s daily requirements, they gradually become emaciated, and their fur becomes dry and brittle, eventually falling out.

 

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Conclusion

Hair loss in laboratory mice, like hair loss in humans, is not a serious condition, so there’s no need to worry. When you observe hair loss in your experimental animals, systematically investigate the possible causes based on the factors mentioned above. If the hair loss does not affect your experimental outcomes, it can be disregarded.

 

 

That’s all for this episode of the Ailinfei Mini‑Class. I hope it was helpful to you all!

Regular mice and disease‑model mice are now available! For experimental services, please feel free to inquire.

 

 

Organized by | Aniphe BioLab Marketing Department

Supervisor  | Solar wind

Editor-in-chief  | Lemon

Editor-in-chief  | Little Swallow

Editor  |  Lemon

 

 

 

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