The protein level of grains is calculated using the whole grain which contains fibre in the husk. Fibre Fibre is an essential element of the rabbit and guinea pig diet. Plant material contains both digestible and indigestible fibre. The fibre requirement of lactating does and sows is lower than that for those animals on a maintenance diet. Diets low in fibre cause serious digestive problems in rabbits and guinea pigs.
Straw is even higher in fibre but has very little food value.
Starch and digestible fibre are converted in the gut to volatile fatty acids used for energy. Essential fatty acid deficiency leads to dermatitis. Supplementing the diet with a balance of omega 3 and omega 6 essential fatty acids will remedy this. Vitamin A Vitamin A is a fat soluble vitamin. Commercial feeds usually have this added at the proper level so there is no need to supplement.