i was at the corn shop years back this bloke was saying to me never use the normal mase its gm and causes young bird sickness. he said use pop corn maze. i thought yeh right he told me he had sickness for 4 years but since not using normal maze hes not had sickness for 3 years. anyway i tried it for my last 2 years and never got young bird sickness this is at a time were loads of people had it some people were sending the birds that had it. might not be nowt in it but it worked for me.