Game Version 4.41d
OS: Win 8.1
Any slaves in jail will have their resistance timer reset if a new slave is captured and jailed. Had a Taurus female with 1 day left on her resistance, and captured a Scylla and the Taurus' timer reset to 22 days, which was the timer on the Scylla. And rolling the day did not break her resistance, the timer was indeed reset.