Hi, there is a rooster mating with one of the hens too much, she has no feathers in a place on the back area of her back. she has red skin and feathers trying to grow. We have bought a hen saddle, as they are buff orpingtons, I think it was too small to fit on them. My dad said we should put mustard on the back of the neck of them hen so the rooster will go away when he pecks her to hold on when starting to mate. I want to see if I can make this saddle bigger but is mustard safe to use because my dad wants to do it ?