Indeterminate nodules are the only type found in Caesalpiniodeae and Mimosoideae and the most common type in Papilionoideae (Sprent, 2001; p. 32). As a result of the variety of ways the plant is infected by rhizobia, there are different types of nodules.
Vitamins are organic compounds that are needed in even smaller quantities than minerals by the horse, although no less critical. Vitamins can be divided into two groups, the fat soluble vitamins A, D, E and K and the water soluble C and B-complex vitamins.
Although results of studies show the amount of biotin needed by a horse is unclear-the recommended daily dose of Biotin is 15 - 20 mg per day-this is the amount generally recognised as being needed to promote quality and healthy horn.his advice is given because the vitamin Biotin is a sulphur which contains B vitamins, which help in maintaining good growth of the hoof horn. Added a horse or pony's feed over a period of months a supplement containing biotin can improve the problem of dry, cracked, brittle or generally bad feet.