Does it affect the surgery? No not really. As long as everything does not freeze and works properly. It gets harder to pull down testicles in the cold weather though, as long as the colt doesn't have a highish one then not a big deal. But dropping a baby into a snowbank in cold weather is a bad situation waiting to happen. Knocking them out is hard on them when the weather is good and warm. It takes that much longer and the liver and kidneys work that much harder to get the drugs out of the system. Puts them at greater risk for a bunch of issues we try to avoid. Most people out here don't have a decent facility to do colts out here, which is why we try to wait until fall or spring to do them. If there is a barn and good lighting then we can do it. Otherwise we wait till spring and grass to lay them down.
I worked for a vet who did them standing. Scared the crap outta me. I prefer to lay them down any day of the week.
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