palatable source of phosphorus


Hi, All - Can anyone recommend a tasty (or at least not objectionable) form of phosphorus to use as a safe supplement for my IR & PPID horses?  As soon as I start adding monosodium phosphate, my horses start leaving a good part of their "goop" uneaten.
Thanks in advance.

Sue & Sunny & Cheyenne (both IR & PPID)
Northern California

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