anyone ever had to use a mis mate inection/s if so any side affects noticed ?

Hi Glenys, I had to do it 2yrs ago, no side effects but vet did say that you can't breed from her next season and don't forget their season starts all over again.
Debbie.

does it when does it start again straight away?

Yes, if I recall correctly,
anyone else got a better memory than me??
It is not quite such a worry as it used to be to give the jab.