How much phosphorus should my guinea pig eat?
Phosphorus is a mineral that works closely with calcium. It is vital for your guinea pig's health, but it must be kept in balance with other minerals.
What the Science Says
In laboratory studies, the recommended amount of phosphorus was often around 196mg to 240mg per day. However, these researchers were looking at young guinea pigs that were still growing. These animals need more minerals for their developing bones.
For pet owners, the most important thing is the balance between calcium and phosphorus. Experts generally recommend a ratio where there is about 1.3 parts phosphorus for every 1 part calcium in the daily diet.
Researching Pet Diets
Cavv looked at 64 examples of daily fresh-food diets recommended by guinea pig experts and organizations. They analyzed these diets to see how much phosphorus they actually contained.
Diet Analysis Results
The analysis found the following levels of phosphorus across the recommended diets:
| Statistic | Phosphorus (mg) |
|---|---|
| Average | 14.41 |
| Minimum | 8.30 |
| 10th Percentile | 10.41 |
| Lower Quartile | 12.20 |
| Median | 13.45 |
| Upper Quartile | 15.93 |
| 90th Percentile | 20.01 |
| Maximum | 25.20 |
Recommended Daily Amount
Based on this analysis, the recommended daily phosphorus intake from fresh foods is 10 mg to 14 mg per guinea pig.
This range represents the lower end of the expert recommendations (from the 10th percentile to the median). This target helps maintain a healthy mineral balance, especially when paired with the recommended low-calcium intake for adult pet guinea pigs. Keeping phosphorus in this range ensures your pet gets what they need without disrupting their mineral balance.
For more details, you can read the full report here: Scientific and Practical Nutritional Guidelines for Pet Guinea Pigs.
