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[RC] Anhydrosis - Barb Peck

This isn't endurance related... but this is a hard working horse, 'so thought 
maybe some of you would have an additional idea:

One of friends daughter's horses is an  9 yr old OTT throrobred, raced untill 6 
years old.
16 hands, fairly well muscled (I think he looks more QH than thorobred) and fit.

He's been coming along doing eventing and now doing some serious work.

Starting last year, he wasn't sweating enough- and since then his owners have 
done everything possible
in the way of nutrition, supplements, his feed and work schedule, blood tests 
to rule out viral (elevated WBC, etc)
other stuff, etc..
and he still has the problem.

Yesterday afternoon, he was ridden 4 miles at speed on dirt road that are 
extremely steep/hilly.
The temp was 90 degrees humiditywas about 60%.
His temp before leaving was 99.9 respirations heart rate were normal for him 
42/16.
From her description, to me it sounded like he was only lightly sweating  (he 
should have benn dripping wet IMO)

Immediately after finishing, he was panting, respirations were >100 , my friend 
couldn't get an accurate heart rate (but she's sure it was lower than 100) and 
internal temp was 103.

It took a half hr. with continual hosing of cold water,  and walking to get him 
back to normal.
Trotting out after 40 minutes, his HR & respirations remained normal.

The horse is being treated for anhydrosis, but owner thinks he may also not be 
getting enough air into the lungs..
I think his panting (prolonged respirations)  is soley do to not being able to 
cool his internal temp thru sweating.

Anyone out there have any ideas?
These people are doing everything right and are expereinced horse people.  

Is there any thing else they can try?

Thanks,
Barb

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