Table 4. Details of the second phase of the breeding experiment including the numbers of F1 individuals and WHITE Bielefeld individuals of each sex that were pair-wise housed in cages with the opportunity to breed.

Sex	F1 Birds	WHITE Bielefeld	Pairs	Resulting number of offspring (broods)
Male	12	12	12	51 (14)
Female	9	9	9	54 (11)
Total				105 (25)

The number of broods can exceed the number of pairs because each pair was allowed to maximally reproduce twice.