How would an animal breeder breeder breed cows that gives more milk

Selective breeding.

Find a cow that produces lots of milk because its in its genes. Then find another cow with the same gene that would produce lots of milk also.

Then you should breed the two cows together ultimately producing a cow that produces lots of milk.

It's speed of rotation.

Ilike to eat pears ya nah wha im sayin b? shout out to all my pears b.