Hi Mooman:
Firs of all, forgive my english. Fenbendasole don´t cure the Blackhead or Hisomoniasis ( it is an ameba). It only prevent it to get the eterakis gallinarum, wich is a parasit , that lives usually with out any simpthom in chicken, but the chicken transmit it to turkeys. The ameba...
Hi:
I have a flock of 25 bronze turkeys (not the broad breasted bronze) and they get 80% of fertility. As you told "nature takes control of it"
Don´t worry.
Good luck
Joselito