Comparisons
Discoid Roach Nutrition Facts: Protein, Fat & Calcium
Discoid Roach Nutrition: The Numbers Behind the Best Feeder Insect
When you're choosing feeder insects for your reptile, the numbers matter. Protein fuels growth and muscle maintenance. Fat provides energy but causes obesity in excess. Moisture supports hydration. Calcium prevents metabolic bone disease. And the ratio between calcium and phosphorus determines whether your animal can actually absorb the calcium you're providing.
This article breaks down the nutritional profile of discoid roaches with hard data, then compares them head-to-head against every major feeder insect on the market. All values are approximate averages based on published nutritional analyses — actual values vary somewhat depending on the insect's diet, age, and the specific analytical methods used.
Discoid Roach Nutritional Profile
| Nutrient | Value (per 100g, as-fed) |
|---|---|
| Protein | ~20% |
| Fat | ~7% |
| Fiber (Chitin) | ~3% |
| Moisture | ~65-70% |
| Calcium | ~20 mg/100g |
| Phosphorus | ~26 mg/100g |
| Ca:P Ratio | ~0.77:1 |
Let's unpack what these numbers mean for your reptile.
Protein (~20%)
Protein is the most important macronutrient for growing reptiles and a critical maintenance nutrient for adults. At approximately 20% protein on an as-fed basis, discoid roaches are among the highest-protein common feeder insects available. This level supports rapid growth in juvenile bearded dragons, healthy egg production in breeding females, and strong muscle maintenance in adult animals.
Fat (~7%)
Fat content of around 7% places discoid roaches in the low-to-moderate range — high enough to provide adequate energy without the obesity risks associated with high-fat feeders like waxworms (25%) or superworms (18%). This makes discoids suitable as a daily staple feeder without worrying about excessive fat intake over time.
Moisture (~65-70%)
The moisture content of discoid roaches contributes meaningfully to your reptile's hydration. Many captive reptiles — particularly chameleons and species that don't readily drink from standing water — rely partly on the moisture content of their food for hydration. At 65-70% moisture, discoids provide solid hydration support with every feeding.
Calcium and Phosphorus
The calcium content of discoid roaches is approximately 20 mg per 100 grams, with phosphorus at around 26 mg/100g. This gives a calcium-to-phosphorus (Ca:P) ratio of roughly 0.77:1 — meaning there's slightly more phosphorus than calcium.
Why does this matter? Phosphorus binds to calcium in the digestive tract, preventing calcium absorption. Ideally, reptiles need a Ca:P ratio of 1:1 or higher (more calcium than phosphorus) in their overall diet to prevent metabolic bone disease. Since discoid roaches (like most feeder insects) are slightly phosphorus-heavy, calcium supplementation through gut loading and dusting is essential.
How Discoid Roaches Compare to Other Feeders
| Feeder Insect | Protein | Fat | Moisture | Ca (mg/100g) | P (mg/100g) | Ca:P Ratio |
|---|---|---|---|---|---|---|
| Discoid Roaches | ~20% | ~7% | ~65% | ~20 | ~26 | 0.77:1 |
| Dubia Roaches | ~23% | ~7% | ~61% | ~20 | ~27 | 0.74:1 |
| Crickets | ~15-21% | ~6% | ~73% | ~14 | ~104 | 0.13:1 |
| Mealworms | ~20% | ~13% | ~62% | ~3 | ~67 | 0.04:1 |
| Superworms | ~20% | ~18% | ~58% | ~10 | ~64 | 0.16:1 |
| BSFL (Calciworms) | ~17% | ~14% | ~61% | ~934 | ~135 | 6.92:1 |
| Silkworms | ~9% | ~1% | ~83% | ~34 | ~44 | 0.77:1 |
| Hornworms | ~9% | ~3% | ~85% | ~46 | ~15 | 3.07:1 |
| Waxworms | ~14% | ~25% | ~58% | ~8 | ~60 | 0.13:1 |
What the Comparison Reveals
Discoid Roaches vs Dubia Roaches
The nutritional profiles are nearly identical. Dubia roaches edge out discoids slightly in protein (23% vs 20%), but the difference is marginal in practical feeding terms. Both species have similar fat, moisture, and Ca:P ratios. For nutrition purposes, they are functionally interchangeable — the choice between them comes down to legality (discoids are legal everywhere, dubias are not) and availability.
Discoid Roaches vs Crickets
Crickets have a dramatically worse Ca:P ratio (0.13:1 vs 0.77:1), meaning crickets deliver far more phosphorus relative to calcium. This makes calcium supplementation even more critical when feeding crickets. Protein content in crickets varies widely depending on the source and what they've been fed — some analyses show as low as 15%. Discoid roaches provide more consistent, higher protein with a significantly better mineral profile.
Discoid Roaches vs Mealworms and Superworms
Mealworms and superworms match discoid roaches in raw protein percentage but fall short in several other areas. Fat content is nearly double (13% and 18% respectively vs 7% for discoids), making them poor choices as staple feeders due to obesity risk. Their Ca:P ratios are among the worst of any common feeder — 0.04:1 for mealworms and 0.16:1 for superworms. Their tough chitin exoskeletons also pose digestive challenges, particularly for juvenile reptiles.
The BSFL Exception
Black soldier fly larvae stand out dramatically in one category: calcium. At approximately 934 mg per 100 grams, BSFL contain roughly 47 times more calcium than discoid roaches. Their Ca:P ratio of nearly 7:1 is exceptional and unique among feeder insects. This makes BSFL an outstanding calcium-supplementation feeder — but their lower protein (17%) and higher fat (14%) mean they work best as a supplement alongside a protein-rich staple like discoid roaches, not as a sole feeder.
Silkworms and Hornworms
Both are excellent supplemental feeders but poor staples due to low protein content (9% each). Silkworms offer outstanding low-fat nutrition and the digestive enzyme serrapeptase. Hornworms provide exceptional moisture (85%) and a favorable Ca:P ratio (3:1), making them ideal for hydration. Neither provides enough protein to serve as a primary feeder for growing or adult reptiles.
What This Means for Your Feeding Strategy
The data points to a clear strategy: use discoid roaches as your staple feeder for their high protein, low fat, good moisture, and relatively favorable Ca:P ratio. Then supplement with specialty feeders to fill specific nutritional gaps:
- BSFL for calcium supplementation
- Silkworms for low-fat variety and digestive support
- Hornworms for hydration and enrichment
- Superworms as an occasional high-energy treat
Always dust your staple feeders (roaches) with calcium and vitamin D3 powder, and gut-load them with calcium-rich greens before feeding. The combination of gut-loaded, calcium-dusted discoid roaches plus a rotation of supplemental feeders provides the most complete nutrition available for captive reptiles.
A note on data accuracy: Nutritional values for feeder insects vary between sources due to differences in diet, age, measurement methodology, and whether values are reported on an as-fed or dry-matter basis. The values in this article represent approximate averages compiled from multiple published analyses and should be used as general guidance rather than exact specifications.
— Matt, Founder, All Angles Creatures
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