With the Shivans, the male/female ratio would be completely irrelevant anyway because of the Shivan policy of total genocide. The window of opportunity in which the Shivans can be defeated before completely overrunning Terran space is far too small for baby-farms to return on their investment, and civilians are not safe at home--the Shivans will destroy anything Terran, and civilians are if anything, less safe cowering in their cities, installations, or transports as the Shivans vaporize them than the soldiers, crewmen, and pilots are.
As for the Terran-Vasudan war, evidence points towards ground operations having largely ceased by the end of the war, and for the pressures on the GTA and PVE being economic rather than demographic. The game implies that both empires are essentially broke and have resorted to relatively low-intensity engagements like Operation Thresher for the most part (one Orion per year or less as indicated by the Typhon description is rather tame compared to the slaughter of the Great War or even the NTF engagement). Under these circumstances, baby farms would not be helpful or desirable.
Women would be far more useful fighting the enemy or working to support the war effort in other capacities (such as industrial work) than making hordes of babies the GTA cannot support (and, in the case of a Shivan conflict, the Shivans would just incinerate anyway long before they grew up).