How Long Does It Take for a Calf to Grow Up?

How long does it take for a calf to grow up? It depends on what you're doing, belike. Some people castrate all the bulls and leave them in; others will breed with em. You don't want a nine month old or sew bull calf out there breeding yuffers. Soif if i wanted milk, right, and i bought day one, just born calf, how long until it can work with the ball to make stark producing milk and get the baby n i see, usually breed heifers around two years old, two years are there. And are they able to in breed like chickens.? Ah, well, i mean,  you castrate all