Sorry to hear about your situation. My females have always had the POS, and have always dropped their babies between 103-109 days, 11 years in a row.
My good friend had a litter this year that didn't have a POS, and still had a litter of 28 live and 1 stillborn.
The differences that I see are after their ovulation. Some stay at the warm end, some stay on the cool side. Some coil up to conserve heat, and some stretch along the walls. Always keeping me wondering. Good luck to you in the future.
Did they ever produce snows?
Take care, David
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--aka DMOG68

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