Mass rat sterilization could be the answer to New Zealand's pest free future ContraPest would make female rats incapable of producing babies.Making rats infertile on a mass scale could be the answer to New Zealand's pest problem. While the technology to make rodents infertile has been trialled in places like New York conservation minister Maggie Barry said it would likely still be a few years before it could be implemented here. Barry floated the idea at a funding announcement in New Plymouth on Thursday for Taranaki's Mounga Project, which aims to ramp up pest eradication and native bird re-introduction in Egmont National Park over the next 10 years. Maggie Barry, Jamie Tuuta and Steven Joyce announced four new investors for the Taranaki Mounga Project on Thursday......for more information please got to www.commercialpestcontrol.net.nz