well i am only 14 and i have already started doing it i have 12 cows that i just keep on pasture that my dad aint using and then i ai them. then i sell the calves to my dad or my g-ma and my g-ma said she would buy my cows so i can get some younger ones. it is working pretty goodi found 30 head of maine-anju heifers that i am goin to buy after i sell my 12 cow calf pairs and the past calves i've sold