Question: Good morning!  Recently, I purchased the Uckele Equi-Omega 4:1 oil & Bioplex Magnesium for an HYPP N/H gelding (7 yrs old) to help with very poor hoof condition with multiple abscesses over the eight month period I have owned him, & slow but steady work to reform hoof bars, bring non-existent heel growth back, soft soles hardened, knees level, angles uniform (still working on this one!), WLD healed, etc.

After giving him the suggested dosage of oil & half the suggested dosage of the magnesium supplement, along w Coastal hay & XTN 3/4 scoop feed (he is an approximately 1300 lb former Reserve World Champion QH halter horse) for a little over a week, he came up dead lame on both front feet last Sun/Mon.
Vet x-rayed front feet & texted me this conclusion "Severely bad coffin joint angle. Needs shoes with @ least 4 degree wedge. Also will probably need coffin joint injections. Mild changes on navicular bone but will need to Address other issues first"
Could the timing of this be related in any way?
This is my 8th horse (I have shown all-around & Reining most all of my 54 yrs), & I have never had severe hoof issues as this.  I purchased him from a "barefoot farrier", but was dramatically unimpressed at the shape & lack of function of the hooves, as was my farrier.  I have communicated with an owner of this horse from approximately 3-4 yrs ago, she said he had hoof issues when she purchased him & they "fixed them", but he never had abscesses when she had him.  I also have seen pictures of this horse from 2 owners back from my owning him, of him emaciated.
He has had an HYPP attack in my care (first horse w HYPP I have ever owned) & I was so careful on hay & grain feeding, but ignorant in supplement & treats & believe that may have tipped him over the edge.  Is it a possibility that the HYPP attack & issues w the front legs are related?
What more, in your opinion, can I do to help this horse live a more comfortable life?  I would love to train him to be an English (flat classes) & Western show horse (approximately 6 shows a yr), do you think this is feasible?  He is one of the sweetest I have ever had the pleasure of working with, & I would like to keep him as my forever horse...Thank You!!!
Dr. Kellon: I'm sorry you are having these issues but I can assure you the 4:1 Oil and Bioplex Magnesium had nothing to do with causing HYPP or the hoof issue - and the HYPP and feet are not related.

I have attached a document that gives background information on HYPP.  However, it appears your major problem is the hooves.

Your vet is describing negative palmar angle. The coffin bone is supposed to rest in the hoof with an angle of up to +5 degrees off being flat and parallel with the ground. With negative palmar angle, the bone actually dips down toward the ground. See:

This is a trimming issue but the tendency is commonly see in QHs.  The result is the deep digital flexor tendon is pulled very tight over the navicular bursa and bone and the edges of the coffin joint are forced into close proximity along the front/top of the foot. Externally you will see underrun heels and often a long toe. These horses also have flat feet/dropped soles and the coffin bone sitting low inside the hoof capsule (sinking/distal descent) which often leads to inflammation of the coffin bone.

There are different approaches to dealing with this. Shoes and pads can provide instant relief but it is short-lived and does not correct the problem. The most successful barefoot approach I know of is:

but it won't happen overnight.

The abscesses may be multifactorial. The hoof form with long toe and underrun heels puts a lot of mechanical traction on the white line which can lead to small breaks which allow bacteria in. Same for any flaring.  Trace mineral deficiencies involving copper, zinc, iodine and selenium also have a negative effect on the integrity of the white line.  If you let us know where your hay is grown we can help with suggesting an appropriate supplement.

Question: Thank You, Dr. Kellon, so much for responding!!!  I have forwarded your comments to my farrier, as we are “undertaking” some corrective shoeing this weekend.

I did text the barn owner to ask where the hay was grown, unfortunately, she said she did not know.  It is Coastal and there is a lot of hay grown here, I would think here in North Florida, South Georgia, or South Alabama?
Dr. Kellon: Hays from that region do have significant trace mineral issues. Try feeding U Balance Foundation at one scoop/day:

One container will be a 4 month supply.  In 4 to 6 weeks you should be able to see a difference in the new growth.