The protein content of ordinary feed formula is about 20%. Guinea pigs have higher requirements for certain essential amino acids (especially arginine). Guinea pig diets should contain a certain percentage of crude fiber, and diets should contain 12% to 14% crude fiber. If the amount of crude fiber is insufficient, guinea pigs will have bowel problems and hair loss. Guinea pigs cannot synthesize vitamin C by themselves and are particularly sensitive to vitamin C deficiency. Deficiency can lead to scurvy, poor fertility, poor disease resistance and even death. Guinea pigs should be supplemented with 10 mg of vitamin C daily. , Breeding guinea pigs should supplement 30 mg. It can be added to feed or directly added to drinking water, with a safety factor of 10% when added.