Telma Tucci

When you speak about 70%/30% of feed (gestation/lactation) based on 21 or more days of lactation. There an important difference between 28 and 21 days of lactation. Also about ad libitum systems going ahead with new technology will be important

Unfortunately no treatment. They can finish lactation but afterwards better to cull them, it would repeat next farrow or before. You can try to interviene surgically to permit survival for a time.

Have you changed feed type? Have you tried some straw? Fever? Is she in a crate or free? Try to free her a bit to have a walk