For more on this subject as well as pictures and video check out my page "From Heat to Birth"
Description on how to check for ligaments:
The ligaments are pencil like rods that run down the rump area to the
tail. They form an upside down V if looking from the butt of the goat.
You feel in a DOWNWARD motion - dont try and squeeze around, this will
give you a false indication on "loose" ligaments.
As the ligaments loosen during prelabor they "fall down"(like a clothes
line sags as it gets used) and become harder and harder to feel. The
rump becomes less rigid and when you feel down for the ligaments it only
feels "mushy" under the skin. The area of the birth canal is now ready
for the kids to pass through.