parrot breeding

1.I feed my parrots a mix of mealies,barley.sorghum which i cook let cool and feed this mix to the birds. Is this healthy as the birds dont have excess to this type of food in the wild.
2.in winter i remove the nest boxes from may to end july, clean them out and add new nesting material.does this effect the birds breeding cycle.
3.can i add wheatgerm oil to the you chicks soft food mix, does this effect them.
4.why do some parrots and parakeets pluck their young in the nest box.
5.prior to the breeding season when is the best timw to feed the following
sprouting seeds, high protein softfood, and adding vitamins and mineral supplements

Representation of groups of birds we keep

Finches

Gouldian Finch

Sexual behaviour of the Gouldian Finch

Click here for video

Soft Bills

Royal Starling

Parrots

African Grey Parrot

Doves

Diamond Dove

Ground-birds

Chinese Painted Quail