matthew bird , from ashburton , new zealand , halved his income by quitting his well-paid job as an agricultural adviser to become a mechanic after he realised he would be expected to pay around $ 1,900 a month .
he said he was happy to give up is $ 70,000 a year that if it meant his child support payment dropped to $ 554 a month .
mr bird has fathered three children and was previously expected to pay $ 1,300 a month in child support .
he said the increased figure is ` unreasonable ' and he believes illegal employment will flourish under the new system that