Manganese is a trace mineral involved in bone development, cartilage formation, and the activation of enzymes that metabolize carbohydrates, amino acids, and cholesterol. It is also a key component of manganese superoxide dismutase (MnSOD), one of the body's primary antioxidant enzymes that protects cells from oxidative damage.
For guinea pigs, manganese supports the integrity of joints and connective tissue — important for animals that spend their lives walking on cage floors and platforms. It also contributes to reproductive health, which matters for breeding guinea pigs. Manganese deficiency is uncommon in guinea pigs fed a varied diet, as hay and leafy greens provide adequate trace amounts.
The body requires only tiny amounts of manganese, and a standard hay-and-vegetable diet easily meets this need without any supplementation.
Guinea pigs need approximately 40 to 50mg of manganese per kilogram of diet. Timothy hay and quality pellets typically provide this. No supplementation needed.
0.1% of daily nutrient intake
Manganese makes up 0.1% of your guinea pig's total daily nutritional requirements by weight. That's a tiny amount — but it matters.
Poor bone development and skeletal abnormalities in young guinea pigs, impaired growth, reproductive problems (infertility, poor litter outcomes), and reduced antioxidant capacity. Deficiency is rare on a varied diet.
Manganese toxicity from food sources is extremely unlikely. The body tightly regulates absorption, and the amounts in hay and vegetables are well within safe limits.
| Life Stage | Size | Min | Max | Unit | Notes |
|---|---|---|---|---|---|
| Adult | — | 40 | 50 | mg/kg diet | Per kilogram of diet dry matter. Adequately supplied by hay and pellets. |
Source: NRC 1995, general veterinary consensus
