yes , i understand that . as a novice i was offered a feeding plan for my system that worked . only a few of my birds done well on it , i kept them ,and moved the others on , built up from there . having honed the system , yes i have come accross the odd exception , ie having a bird return after missing a few days sticking him in a box with some barley ,and come basket night finding the late comer looking fit and well ,and sending him to come home first .