I want to know the answer to the following question:
What percentage of broods produced by incestuously paired females contained extra pair of young?
All the background I'm provided with is that "Females paired with related males may undertake extra pair matings (see Promiscuity#Other animals for 90% frequency in avian species) that can reduce the negative effects of inbreeding.". Is that enough to answer the question?
Answer: no