Jose Leguizamon if your cows rumen pH is so low that the salts are broken and then fatty acids released and biohydrogenated, you really have a big problem that must be fixed first.
Moreover, MFD mainly comes from trans-10 fatty acids, coming from C18:3 and C18:2. As palm barely contains them, MFD due to Ca salts break does not sound to be the main cause of the problem.
Do you include Ca-salts as substitution of?
I’d like to see your data/whole picture: formulation, etc.