My jersy cow is 4 months pregnant, can I give salt stone for licking

Yes, a salt lick stone is fine for a pregnant Jersey cow. Keep it in a dry place and let her lick it as needed. Do not give too much loose salt on top of it. Also keep clean water always available and continue normal green fodder, dry fodder, and balanced concentrate. If she is eating less, has swelling, or looks weak, then get her checked. Consult a veterinarian before administering any medicine or treatment.