Also re: AI, sometimes its just the most practical option! For instance, Houston already has four bulls housed in their bachelor herd and has had severe issues with herpes in the past. Why risk messing up what has now become an *extremely* successful herd, when you can just AI Tupelo instead? Other times, like Columbus and Melbourne, you have fertile bulls who are behavioral non-breeders but still fertile. In those situations, AI can be cheaper than bringing in a new bull since they can do semen collections on site. Or you'll have cows like Bluebonnet at Fort Worth, you could put them in with the most experienced, fertile bull in the world, and they still won't conceive, since they won't stand for the bulls to breed them. In this case, AI is the ONLY option to get them breeding!
Ultimately, natural breeding is and should be the ideal, but AI 100% has its uses and needs to be done regularly, to help improve the ongoing knowledge and effectiveness of it. It's simply a management tool like any other, the same as foot care, tusk trims, and blood draws.