The enzymes have been identified, isolated, grown and then added. Believe it or not there are companies supplying individual microbes and there metabolites (enzymes). The urease enzyme is everywhere as are the others. There is a very strong chance that the keyboards we are using now has the urease enzyme on it.
The handling of these enzymes and incorporating them onto the soya isn't easy or straight forward. Most manufactures heat treat the soya and enzyme which is easier but has the side effect of decreasing the reaction when urea and feed is eventually added. Mixing the urea, soya and enzyme before adding the feed reduces the reaction even more. All this will impact the end result.
The handling of these enzymes and incorporating them onto the soya isn't easy or straight forward. Most manufactures heat treat the soya and enzyme which is easier but has the side effect of decreasing the reaction when urea and feed is eventually added. Mixing the urea, soya and enzyme before adding the feed reduces the reaction even more. All this will impact the end result.