Izisombululo zethu zokusila umgubo ziyilwe ikakhulu ngokwengqolowa yaseMelika kunye nengqolowa enzima yaseAustralia emhlophe.Xa usila uhlobo olulodwa lwengqolowa, izinga lokutsalwa komgubo lingama-76-79%, ngelixa umxholo wothuthu ngu-0.54-0.62%.Ukuba iintlobo ezimbini zomgubo ziveliswa, izinga lokutsalwa komgubo kunye nomxholo wothuthu luya kuba ngu-45-50% kunye ne-0.42-0.54% ye-F1 kunye ne-25-28% kunye ne-0.62-0.65% ye-F2.