Can you tell me about inhumane slaughter?!

Can you tell me about inhumane slaughter?

Another one of my curiosity questions. I ask certain things to vegans just to understand. Not to offend.
I don't do things that way, especially on subjects I do not understand enough about. Unfortunately I'm sure I'll still get some rude comments from the immature.

I'm not doubting truth in that certain styles of the killing processes of animals are cruel because without a doubt, some are. I dislike that, and to the best of my abilities I avoid it. (and I'm sure that vegans avoid it all together because you can never be sure)

I am what you can call "in the agriculture business". I raise animals (cattle and goats) that are bred for their meat quality. They will be showed in multiple livestock shows and then sold to slaughter.
I've seen or have heard of the slaughter process of multiple places, and their ways seem very quick and unharmful.

But how many of you have actually seem inhumane slaughter processes and what percentage of places do you think this happens?

The days of sledgehammers has gone away (for the most part) and now it is a quick shot to the head with a pneumatic gun that uses air. The air is so strong that a 'air-bullet' is pushed in to the brain and death is very quick. With chickens they use a method that involved inserting a sharp point into the throat that comes out the top of the head. Again, it is quickest (and yes least expensive) way to kill humane. With other animals it is about the same. Hogs tend to have brains that are offset so it may take more than one shot. The throat is then slit and the animal 'bleeds out' quickly. This is to prevent bruising as an animal thrashes. I know this because in the 1970's I was in Ag in high school. We had to watch as the animals were processed in different ways. So this is just the most common that I am aware of.