Heresy coming up! If you need a larger beefy animal they why not buy older Dexter cows (not heifers) and put them to a commercial breed - Angus? I don't know what is available in NZ. You will then have a herd of small, easy care cattle which don't live on air but also don't need hard feeding and which don't puach land so badly. The calves will be excellent and larger..... the better cows could be AI'd to a Dexter bull .....? Just a wee suggestion
Jo