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The Calcium reserves of a Zeba Finch Scientist reported that zebra finches will deplete the calcium reserve after the 5th egg. The study showed a five-egg clutch has a total calcium requirement of 89 mg, but the total calcium reserve of a female is only 90 mg.
RAZA ESPAÑOLA CANARY/ SPANISH RAZA - History - Standard Description
RASMI BOLAND CANARY - History - Characteristics & Standard

WHAT IS A PASSE-PARTOUT CANARY?

The word “passe-partout” comes from French and means “master key" or "all-purpose". We remember the name of the servant Passepartout from Jules Verne's famous "Journey Around the World in 80 Days": He was versatile and usable, a man just in case. But how is the term passe-partout associated with a canary?
We divide the melanin canaries in two groups. Black and brown belong to the oxidized melanin canaries. Then we have the diluted melanin canaries to that belongs the dilution of black, called agate and the dilution of brown, called isabel. What happens if we mate an isabel male (which is genetically a diluted black and diluted brown) with a black female? From this mating we only get black males and isabel females. Due to the sex-linked inheritance, are only one chromosome present in females. So genotype is phenotype. In this case isabel. All black males are passe-partout males, which are now split (carrier) in agate, brown and isabel.
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If we now mate a passe-partout male with an isabel female, this combination will result in all classical colours (black - agate - brown - isabel), each 25%. Each of which in turn is 50% male and 50% females.
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25 % Black
Isabel ♀
Black ♂ (Passe-partout)
25 % Brown
25 % Agate
25 % Isabel
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Black ♀
Isabel ♂
50 % Black ♂ (Passe-partout)
50 % Isabel ♀
50 % ♂  50% ♀ 
50 % ♂  50% ♀ 
50 % ♂  50% ♀ 
50 % ♂  50% ♀ 
1st Mating Example by www. birds2u.info
2nd Mating Example by www. birds2u.info