Protein supports muscle maintenance, fur growth, immune function, and tissue repair. Guinea pigs are herbivores — their protein comes entirely from plants, primarily hay, pellets, and leafy greens. Growing, pregnant, and nursing guinea pigs need more protein than healthy adults.
Adult guinea pigs need roughly 14-16% protein in their overall diet. Timothy hay plus daily vegetables and a small amount of pellets typically provides this.
15.9% of daily nutrient intake
Protein makes up 15.9% of your guinea pig's total daily nutritional requirements by weight.
Poor coat condition, slow wound healing, weight loss, muscle wasting, reduced immunity.
Excess protein is generally excreted, but very high-protein diets may stress the kidneys over time. Not typically a concern with a hay-based diet.
| Life Stage | Size | Min | Max | Unit | Notes |
|---|---|---|---|---|---|
| Adult | — | 14 | 16 | % of diet | Percentage of total diet by weight. Hay and pellets provide the bulk. |
| Pregnant / Nursing | — | 18 | 22 | % of diet | Higher protein needed for fetal development and milk production. |
Source: NRC
