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Albino appearance aviaries beak bi-colour bird room blue body colour bred breeders breeding season Budgerigar Society Budgies buff Cage Birds Chapter cheek patch chicks chromosome Cinnamon White clean Cobalt cock cod liver oil colour varieties commence course crossing dark factor Dark Green/blue Dark Greens darker in proportion described desirable diastase eggs exhibition fact fanciers faults feather-plucked feeding front genetic Grey Greens Greywing head homozygous improve in-bred in-breeding judges Light Green Light Green/blue light suffusion Light Yellows line-breeding Lintonholme long feathers darker Lutino mask mating Mauve method millet moult neck nest boxes never non-linked Normal colour Opaline out-cross owner pair parents pedigree perch possible produce properties purchased pure purpose selection sex-linked shade show cage side Skyblue specimens spots spray Standard strain suitable training cages ventilation Violet vitamins whilst wing markings X chromosome Yellow-wing youngsters