Feeding is central to a degu’s physical health and daily activity. A suitable diet must provide nutrients while allowing prolonged chewing, exploration and foraging. Understanding the feeding ecology of Octodon degus helps us assess what we offer in captivity, although it does not provide a complete, experimentally established recipe for every pet.
Diet deserves particular attention because dental disease is common in veterinary patients. In a retrospective study of 300 pet degus, acquired dental disease affected 60% of the animals examined; this is a clinical sample, rather than a prevalence estimate for all captive degus. 1
What do degus eat in the wild?
Wild degus eat a variety of plant material, including stems, leaves and seeds. They select among available foods rather than simply eating everything around them. Seasonal availability changes both the plants consumed and the nutritional composition of the diet. Seeds have been reported to account for roughly 20–60% in particular seasonal dietary observations; those figures describe the study conditions and should not be converted into a fixed seed allowance for pets. 2 3
Food choice can help degus obtain protein and other nutrients in a habitat where much of the vegetation is fibrous and relatively poor in readily available energy. Their diet should therefore be understood in relation to the habitat, season and foods available. See also the degu’s diet in the wild.
Feeding degus in captivity: a real challenge
Captive animals depend on the choices made by their carers. Commercial availability, an animal’s enthusiasm for a food and the appeal of a colourful mixture are not reliable measures of nutritional suitability. Species-specific requirements are still incompletely documented, so feeding recommendations must combine available research, clinical knowledge and careful monitoring.
Quantity matters as well as composition. Obesity is a recognised welfare concern in companion animals, and excessive feeding can reflect human habits, emotional attachment or repeated use of food as a reward. Comparisons with addiction have been proposed in the pet-obesity literature, but these are explanatory models, not a diagnosis established for degus. 4 5 6 7 Stress, limited exercise and a monotonous environment can also affect feeding behaviour and body condition.
Food can serve as enrichment: scatter suitable portions, hide them in safe objects, or distribute them around the enclosure so that animals search and explore. A bowl can still be useful for monitoring intake. The aim is to provide opportunities to forage while ensuring that each animal actually obtains its share, especially in a group.
Understanding nutritional needs
Degus inhabit varied Chilean environments, including areas reaching approximately 2,000 metres in elevation. In the central Mediterranean zone, winters are generally wetter and summers drier. Their intake of leaves, stems and seeds changes accordingly; the wild diet is not a single, unchanging mixture.
Quantity
A fixed ration cannot suit every degu. Body size, age, activity, health and the energy density of the food all matter. Weigh animals regularly and assess body condition, rather than assuming that every captive degu is overweight or restricting food on that basis alone. An allowance around 20 g per day sometimes quoted in feeding guides must be interpreted in context: it is not a universal limit on all food, and hay should remain freely available. 2 Sudden weight loss or reduced appetite requires investigation rather than a simple change in portion size.
Fibre
Fibrous plant material is the foundation of feeding. Degus have continuously growing incisors and cheek teeth, so the time spent chewing and the physical properties of food are important alongside its chemical composition. This differs from rodents in which only the incisors grow continuously. 8
Crude-fibre values of at least 15%, and preferably around 25–30%, are often used when comparing foods for degus. These are practical guide values, not a complete description of fibre or a guarantee that a product will provide enough chewing. Long-stem hay and other appropriate plant material cannot be assessed by a crude-fibre percentage alone.
Insoluble and soluble fibre have different properties. Cellulose and some hemicelluloses contribute structural material; lignin is an associated plant component rather than a carbohydrate digested like starch. Pectins, gums and mucilages include soluble fractions, but their viscosity and fermentability vary. Fibre supports digestive function and can influence nutrient availability, without guaranteeing normal blood glucose in every animal.
Degus also practise coprophagy, re-ingesting faecal material as part of their digestive strategy. A figure of approximately 40% has been reported under particular study conditions; it should not be treated as a fixed proportion for every animal or diet. 2
Protein
Protein supplies amino acids needed for tissues, muscles, digestive processes and immune function. General immunology texts explain its biological importance, but do not establish a degu-specific feeding requirement. 9 A protein content around 15–18% is used here as a practical comparison range, to be considered within the complete diet.
More protein is not automatically better. Research on high-protein diets in other species cannot, however, be used to claim that protein-rich food necessarily causes fatal stomach foaming in degus. The cited report on circulation is not a clinical feeding trial in this species. 10 Abdominal swelling, pain or loss of appetite calls for veterinary assessment rather than an assumed dietary diagnosis.
Fat
Fat provides concentrated energy and contributes essential fatty acids and the absorption of fat-soluble vitamins. A range of approximately 3–7% is used when comparing foods. 2 Seeds and nuts can make a substantial contribution to energy intake, so they should be considered within the whole ration and offered in measured portions. Their natural origin does not make unlimited quantities appropriate.
Sugars, starch and non-structural carbohydrates
Non-structural carbohydrates (NSC) include sugars and starch, not simply “fast sugars”. Many labels do not give NSC directly. A commonly used estimate by subtraction is nitrogen-free extract (NFE): 100 − (crude protein + crude fat + crude fibre + ash + moisture), with every value expressed on the same basis. NFE is not an exact NSC measurement, because the fractions measured by these analyses do not correspond perfectly to carbohydrate chemistry.
The 30% figure used in our comparison table is an upper comparison criterion, not a target that must be reached by adding sugar or starch. Avoid sugary foods and assess the entire ration, including treats. Degus have been used in experimental research on diabetes and related cataracts, but these findings do not mean that every animal eating a particular food will develop the same disease. 11 The species is also studied in research on ageing and cognition. 12
Glucose regulation and susceptibility to diabetes involve more than a simple claim that insulin is produced slowly and must “recover” before another meal. Experimental work has documented cataract development and treatments in diabetic degus; it supports taking the risk seriously without making every cataract a diagnosis of diabetes. 13 11
Calcium
Calcium is essential to bones, teeth and other physiological functions. Dental disease was found in 60% of the 300 veterinary patients mentioned above and was particularly frequent in older animals, approaching three quarters in the older subgroup. These clinical observations do not establish that calcium deficiency is the cause of every case. 1
Our comparison criteria use approximately 1–1.2% calcium, with attention to the calcium-to-phosphorus ratio. Mineral balance matters: experimental diets have affected dental and renal findings in degus. 14 15 A percentage alone cannot compensate for poor chewing opportunities or rule out other causes of dental disease.
Phosphorus and the calcium-to-phosphorus ratio
Phosphorus is essential, but its amount relative to calcium requires attention. A high-phosphorus experimental diet was associated with kidney changes in degus; this does not make phosphorus inherently harmful or justify indiscriminate supplementation. 14
The table retains the site’s comparison criteria: a calcium-to-phosphorus ratio of at least 1.6:1, with approximately 2:1 preferred. For example, 1% calcium and 0.5% phosphorus give a 2:1 ratio. These are feeding-guide criteria, rather than experimentally proven thresholds that prevent all dental disease. 2
Guide values used to compare foods — interpret these together with the complete ration, moisture basis and the animal’s condition:
| NSC | Fibre | Protein | Fat | Calcium | Phosphorus | Ca:P ratio |
| 30 % | ⩾ 25 % | 15 % to 18 % | 3 % to 7 % | 1 % to 1.2 % | 0.5 % | 1.6:1 minimum 2:1 recommended |
Vitamins
Vitamins are required in small amounts, and the complete diet must be considered before adding supplements. An ingredient’s presence does not establish the final amount available to the animal, and excess supplementation is not automatically harmless.
Vitamin C
Vitamin C is often discussed in small-herbivore feeding, particularly for guinea pigs. Their obligate requirement for dietary vitamin C should not be transferred automatically to degus. The sources cited here do not demonstrate that routine vitamin C supplementation benefits every healthy degu, nor that any dose is harmless. Seek an individual recommendation where illness or a dietary imbalance is suspected.
Vitamin D
Vitamin D contributes to calcium regulation and skeletal health. The cited review concerns human medicine, so it provides background on vitamin D rather than a validated degu dose. 16 Dental care in small herbivores likewise involves several interacting dietary and husbandry factors. 17
Diet and exposure to ultraviolet B radiation can influence vitamin D status, but ordinary window glass does not provide the same UVB exposure as unfiltered sunlight. Neither access to sunlight nor a lamp should expose animals to overheating or remove their ability to retreat into shade. The amount supplied by hay and prepared food can vary; consider all sources together.
Experiments involving mineral composition and UVB exposure cannot be reduced to a claim that twelve hours of UVB inevitably causes vitamin D poisoning or that all lamps damage teeth. The studies cited do not justify such a general conclusion. 15 14 Similarly, supplementation should not be presented as a guaranteed solution for every animal. The SAB Degu Mix article discusses the DIC protocol, including its suggested average daily intake; that guidance is distinct from an individually prescribed treatment.
Choosing foods
Hay
Offer good-quality hay freely and replace material that becomes damp or soiled. Hay provides fibrous plant material and sustained chewing; dental guidance for degus emphasises the importance of an appropriate herbivorous diet. 8 The 10–20% proportion quoted in some descriptions of a particular mixture is not a universal limit on a pet degu’s hay intake. Introduce suitable varieties gradually, and consider freshness, dust, plant composition and whether the animals actually eat them.
Hay also gives degus opportunities to search for preferred strands and gather nesting material. Keep it clean, for example in an accessible open rack away from soiled bedding. Its calcium content and calcium-to-phosphorus ratio vary with plant composition and must be considered within the whole ration. Introduce different hays gradually; see the hay comparison for the criteria used.
Water
Fresh, clean drinking water must always be available, whether provided in a suitable bottle or a stable bowl. Check bottles for blocked valves and leaks, and clean containers regularly. Fresh plants contribute moisture but do not replace drinking water, including during hot weather. Introduce fresh foods gradually.
The cited material does not support the statement that degus cannot process chlorine in potable tap water. Use water that is safe to drink and investigate any local quality concern. Its mineral content and suitability may matter in particular medical circumstances; a blanket claim that pH or minerals never matter would also be unjustified.
Commercial foods
Commercial products vary considerably. Assess the current label rather than assuming that a product is suitable because a degu appears on the packaging. Examine fibre, sugars and starch, fat, minerals and the ingredients used, and account for selective feeding in mixed products. A historical comparison cannot establish the quality of every current formula.
A prepared-food allowance around 20% is sometimes given as an example alongside a predominantly fibrous plant diet. It should not be treated as a universal rule for every rodent or a reason to restrict hay. See the commercial-food comparison for the criteria used. 8
The SAB Degu Mix
The SAB Degu Mix is a plant-and-seed feeding approach developed within the degu-keeping community. Its emphasis on varied plant material, measured seeds and foraging offers a useful framework to examine, but it is not an experimentally proven ideal diet or a guarantee against diabetes and dental disease.
Any home-prepared ration requires attention to the proportions offered, selective eating, mineral balance and the animals’ actual intake. Provide variety thoughtfully, make changes gradually and monitor body weight and condition. Suitable fresh plants and herbs can diversify feeding opportunities without making unlimited treats appropriate.
Conclusion
A suitable feeding routine combines a predominantly fibrous diet, freely available hay and water, measured energy-rich foods, opportunities to forage and regular observation. No single label percentage replaces that overall assessment. Changes in appetite, chewing, droppings, body weight or behaviour should prompt investigation, with veterinary advice when needed.
Sources
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Contribution à l'étude des affections bucco-dentaires chez les rongeurs et lagomorphes domestiques. Historical thesis reference: author and the identity of the linked document could not be independently confirmed; no unverified author attribution is supplied.