Izixazululo zethu zokugaya ufulawa zenzelwe ikakhulukazi ukolweni waseMelika kanye nokolweni oqinile wase-Australia.Uma ugaywa uhlobo olulodwa lukakolweni, izinga lokumuncwa kukafulawa lingama-76-79%, kanti umlotha ungu-0.54-0.62%.Uma kukhiqizwa izinhlobo ezimbili zikafulawa, izinga lokukhipha ufulawa kanye nokuqukethwe komlotha kuzoba ngu-45-50% kanye no-0.42-0.54% we-F1 no-25-28% kanye no-0.62-0.65% we-F2.