A process and system is shown for obtaining a dry milk formula, having (a-i) ultrafiltration of an animal skim milk composition having 70-90 wt % casein and 10-30 wt % whey proteins, based on total protein, and (a-ii) ultrafiltration of an animal whey composition having 0-25 wt % casein and 75-100 wt % whey proteins, based on total protein； or (a-iii) ultrafiltration of a mixture of the compositions of (a-i) and (a-ii), (b) removing polyvalent ions from the UF permeate originating from step (a-i) and/or (a-ii) or (a-iii) to obtain at least one softened UF permeate； (c) combining the at least one softened UF permeate with a UF retentate to obtain a combined product； and (d) drying the combined product to obtain a dry milk formula.
