My horse had a virus twice last year and had to have 3/4 weeks complete rest each time - he was as right as rain after that.
However due to the very low cell count in the blood tests both times, I was advised to try Red Cell supplement and have kept him on it ever since. This year we got by without any problems at all!
well, he didnt feel 100% and jumping wise he was putting a lot more "hurdling" effort into his jumps (1.20 course) which he used to do last year.
That was all the symptoms really, apart from getting tired near the end of a xc course (which I thought was acceptable given length of course
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dunno, he just didnt feel "right" to me - very sublte and hard to tell as Merlin keeps going no matter what
Did the vet take any boods? As Ex-Racers said, Red Cell is an excellent pick me up for lethargic neds, as also is Equivite as a broad spectrum vit/min suppliment.