Breeders focus on certain traits of a cow. Hence, "purebred". These cows are important for shows if interested, and as seed-stock cattle, that are sold for how well they are bred.
Breeding can be difficult if the bull cannot impregnate the heifer. Artificial insemination may need to be used. If milking, proper procedures, like cleaning, crying, and milk let down, all ensure a healthy utter,
The beef industry as a whole has mostly negative effects on the planet. It contributes to land and water degradation, biodiversity loss, acid rain, coral reef degeneration and deforestation. As well as producing greenhouse gas into the atmosphere.