RE: [RC] Calcium issues at a ride - heidiAngie is on the right track here. To expand on what she said, calcium problems at rides usually are not due to calcium deficiencies--they are due to an inability to mobilize calcium. There is a fairly narrow "normal" range for blood calcium, and the horse regulates this with hormones that either help to excrete calcium (when there is too much) or that help to mobilize calcium from the bones (when there is not quite enough). Since calcium needs rise with work, if you have a lot of excess calcium in the daily diet, the horse has plenty of the hormone available to excrete calcium, but not enough of the one to mobilize it--so the horse ends up with problems. Most endurance horses don't need more dietary calcium (do check your forage source, as several posters have mentioned)--but if they have trouble mobilizing it when stressed, then they need added calcium just at those times--ie at rides.
For those who don't otherwise need e-lyte supplements, living daily on a grass hay diet and adding a wedge of alfalfa at vet checks at a ride will usually provide sufficient calcium supplementation. For those who do use e-lyte supplements, aim for a supplement with good levels of available calcium. (And for that, you need to ask someone other than me, since I don't use e-lyte supplements as a general rule, so don't keep up on them.)
Heidi
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