Holm I have never heard of AI not working. I always thought it was more effective than a bull. Some cows just do not take. I find the process to be gross and not for the weak of heart, But I have never been a fan of shoving a hand 3 feet up a cows butt. I have never done AI myself, the only time I have had to reach inside of a cow is when a calf was breach. I did it, not joyfully, if I could not pawn the job off on someone else.
As Minnie says it give you better genetics at a reasonable price. I do not think it is much more expensive than keeping a bull. The only thing is you do not get to grill the AI technician like you do the bull when his job is done.
Your bull story reminds me of one I heard years ago. A guy was complaining he had a great bull but it was so cross eyed it could not zero in on the cows. He mentioned it at church one Sunday, and a neighbor said he would come over and show him how to fix the eyes. He told him it would take about a week of simple treatments to be done..
The guy shows up and looks at the bull and says "Yep, he is cross eyed and we can fix him".
First the guy cut a length of garden hose about 5 feet long, then he shoved it up the bulls butt. He had the owner watch the bulls eyes to see if they uncrossed. The guy blew hard into the end of the hose and sure enough the bulls eyes straightened out.
The owner was ecstatic! The church guy told the owner to try it, to see if he could do it.
The owner then went behind the bull and pulled the length of hose out of the bulls butt and put the end the church guy had blown on into the bull. The church guy was dismayed and asked " what are you doing?"
The owner turned to the church guy and said " Well, you didn't think I was going to put my mouth on the end you put your lips on did you?"