Skippy; I've gone through a 3 years education/high school on horses and according to them it's just a long-lived myth that the cribbing horse actually swallows air :)
As I said -some-
vets believe cribbing may cause colic because of "swallowing air". And I followed it up by saying that causes of colic can be ambiguous at times.
To elaborate, what I was trying to say is... Some vets/horse people think that cribbing can lead to colic. It is not a fact that cribbing does make a horse colic, nor can it be completely dismissed.. because truthfully, it is pretty much impossible to say it is a myth.. because there may just be that -one- horse out there that does colic because of cribbing.
cribbing often starts on horses that doesn't get enough food, or by some reason has a problem/pain in their digesting systems, which in turn can cause colic
And i've never met a horse that started cribbing solely because of poor nutrition. The cribbers i've met started cribbing because of high stress lives and extreme boredom/isolation.
I hope that makes more sense. I tried my best to cover my bases but evidently I failed :p
Sorry to drag the thread off topic guys. I know this thread is about trying to curb a horse's cribbing, but I wanted to make sure I replied to this :p
**Edited to add** http://www.equi-therapy.net/equi-the...dsucking.shtml
"Crib-biting and windsucking are different variations of the same vice in each case the horse swallows air."
UC Davis Book Of Horses: http://books.google.com/books?id=bYw...um=1&ct=result
"the horse simply flexes his neck and forcibly swallows air"
(i have more quotes from this, I just don't want to type them out since its a screenshot of the book)