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.
The most well-known ratio in the horse diet is the calcium:phosphorus ratio, but there are other important ratios as well. These ratios are so important because the concentration of one mineral will exert influence over the absorption, metabolism, and use of other minerals, vitamins, and nutrients.