You know the one. She's so stable you're unable to reverse her or get viable pollen. She's everything you want in a donor mum, except submitting to STS the way you want.
These girls benefit from alternative application methods and schedules you'll find in the Advanced Tips/Techs for Success classroom under "Stubborn Mommas." Learn how to pull viable pollen from girls who either won't give it up, or are giving you sterile pollen.
p.s. These are the favorites for "Bomb-Proof" femmed genetics. ;)