Advice needed

[Tallan]

Our new mare arrived yesterday, an ex brood mare and has come into season.
Our gelding, who in the past has lived happily with mares, no problems at all.
Then last year he raped a mare, the way he cut her up no other word for it, poor lass was in shock.
We recently lost our other gelding and borrowed a pony mare for company, no problems, this lass came and bingo problems.
Is it better to supplement her or him.
Thanks for reading.
PS we have seperated them for now

 

[Big Muddy rancher]

You may just have to keep them separate.
Strange if he had always been with mares that he would do that. They did get both testicles when they cut him?