to me springing is when the back end starts loosing up. the udder on a heifer can fool you, i had one this year that i saw get bred by my bull and had her checked. my father-in-law looked at her at 3 months prior and said she is getting close. he knows cattle pretty good so i was a little worried that maybe my neighbors bull might have !! what i didn't know was that was not near where her udder was going to be, it was huge. she calved about 2 days past her due date Feb. 4th. i was right for once