That limits it some, but the next version (which is coming but a series of sicknesses, deaths, job craziness, and breaking the game attempting to build a whole new area has delayed) will address that far better.
Without too much detail, it’ll break down growth into Temporary for pregnant slaves vs Permanent/hyper growth & hyper-lactation for trained cattle. Should provide a happy medium to both sides of the “expanding slaves” and “usable slaves” aisle.