A feed supplement energy source for ruminants, swine and poultry comprised of a carrier and the reaction product of a water soluble polycarboxylic acid, a metal salt, and a C3 to C10 fatty acid, the water soluble carboxylic acid having a pendant carboxylic acid group and being linked to the metal of the metal salt, which is in turn linked to the C3 to C10 fatty acid.
