I am curious where you heard that? Is it from people that have
experience with cows?
Personally, I wouldn’t worry about it a bit. I’d just find a good AI tech, and do it.
I’ve kept cows for years, and if ever one of them doesn’t settle the first try, it’s for reasons like timing (most common) or it could be the skills of the AI person, or pronlems with cows reproductive system, not because the cow was a heifer.