I have a pair of normal Gouldians both with purple breasts which produced offspring with both purple and white breasts. How can this happen?
The parent birds although showing purple breasts are both carrying the gene for white breast. In other words they are split for white breast. White breast is recessive to purple breast. On average, 75% of the young from these parents will have purple breasts and 25% will have white breasts. Also two thirds of the offspring with purple breasts will be split for white breast. Unfortunately you cannot distinguish by visual inspection pure purple breasted birds from those that are purple but split for white. Other recessive colour mutations in Gouldians include blue back and Australian yellow.
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