I might have missed something? But why would he being fed something the others are not have anything to do with him being aggressive towards the mares?
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Food intolerance greatly exacerbates bad behavior. I know because I have a gelding like that.
Why is it always the bigger ones - mine is the biggest horse at 16.1H. He is third in the pecking order, wants to be first, and will beat up on horse #4 whenever the mood strikes him; and they're on 22 acres
To the OP, don't feed that horse any alfalfa - zip, zero, none, nadda. If he's that big of a snotface, he does not need any more protein.
I would get your Bully off the senior feed UNLESS it's completely grain free.
My horse is oat/corn/soy intolerant. Soy is the worst booger for him and finding a vit/min supplement that is soy-free is next to impossible.
You're on the right thought process to change his feed; just know that while that helps, it is not going to change his inherent nature, which is to be a bully.
I have tried everything and, short of giving my horse a lead earring, nothing works. I finally took horse #4 out of the main pasture because he has leg injuries and the Bully Horse was seizing the moment on his weakened condition
Fortunately our whole place is cross-fenced so the injured horse is in the yard and the three acre pasture by the house; he has about five acres to himself and is quickly learning it not such a bad deal to be "Mama's Boy" whenever I go outside - lollollol
You're right to separate your Bully from the mare, hopefully they can at least see other for mental socializing that won't get her hurt.
Back to the feed - I'm sorry I'm jumping around, I had a root canal yesterday, it's early, and I have to do the "wake up hay call" in a few minutes; I am not coherent
Can you get McCauley's by chance? or EquiPride? Both are soy-free and grain-free. McCauley's M-10 Balancer is soy & grain-free, and takes about 2lbs daily.
EquiPride is a vit/min supplement that only requires 10 ounces daily be fed. EquiPride is in meal form and can be fed as a stand alone or a top dress over your beet pulp.
Hope this helps