Farriery questions

[Lif Strand <fasterhorses@gilanet.com>]

I'd like anyone who knows the facts & figures to tell me answers to the 
following:

The issue:  Shoes on a horse may cause a decrease in circulation due to the 
restriction on hoof wall expansion.

1)  Just how much restriction is actually caused (percentage wise) when 
shoes are nailed onto a hoof?  References?

2)  How *much* of a decrease in circulation can occur in any (soft tissue) 
body part before permanent damage occurs (in percentage)?

3)  How *long* could any major (over 50%) decrease in circulation occur 
before a (soft tissue) body part was permanently damaged?

Thanks whiz kids!

Lif Strand
Quemado NM  USA
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