tallyho!
Following a strict mediterranean diet...
I think sometimes horses do need a little something to help the nerves and I think magnesium is a good way if it works. If you're feed contains enough Mg already then it may be the uptake pathway that needs looking at i.e. the gut. There may something you're feeding that's cancelling it out.
From my experience in Mg supplementation, it's better to test in urine as it's so readily excreted by the kidneys and since there is very little Mg in the serum, it's hard to do a blood profile and I think most vets will do urine tests. I think it's called an EMg? Can't remember but it does accurately calculate levels of Mg according to the NRC.
I would look to profile the diet as a whole though as if you don't address that, then it becomes a vicious cycle. I was supplementing and then changed diets and we haven't really had an issue, not even with a sudden flush of grass.
From my experience in Mg supplementation, it's better to test in urine as it's so readily excreted by the kidneys and since there is very little Mg in the serum, it's hard to do a blood profile and I think most vets will do urine tests. I think it's called an EMg? Can't remember but it does accurately calculate levels of Mg according to the NRC.
I would look to profile the diet as a whole though as if you don't address that, then it becomes a vicious cycle. I was supplementing and then changed diets and we haven't really had an issue, not even with a sudden flush of grass.