Prickly Pear Cactus - Opuntia phaeacantha /engelmannii

A good addition to your gutload, in moderation - contain a good amount of calcium, but Older pads, flowers and fruits are fairly high in oxalic acid (younger pads less so). Also provide Potassium, Vitamin C and Magnesium, and a little niacin.

In about a cup (150g) would provide roughly:
130.45gWater;
61kcalEnergy;
1.09gProtein;
0.76gTotal lipid (fat);
14.26gCarbohydrate, by difference;
5.4gFiber;
83mgCalcium;
0.45mg Iron;
127mgMagnesium;
36mgPhosphorus;
328mgPotassium;
7mgSodium;
0.18mgZinc;
20.9mgVitamin C;
0.021mgThiamin;
0.089mgRiboflavin;
0.685mgNiacin;
0.089mgVitamin B-6;
9mcg Folate

A thread on this topic: http://www.chameleonforums.com/cactus-gutload-39562/