spalding

correct they are a cross...but when breeding spalding they will alway produce spalding....they don't breed true , because chicks can take after either side. even in the same hatch chicks can look different.

Deerman ! on the first generation .
So if there are 10 chicks - all are Spalding  but there are :

Spalding 25% (25% green).
Another Spalding 50%.
Another Spalding 75% (25% blue and 75% green) = emeralt Spalding.

Right ?

Well say the spaldings are half green and they reproduce each of the chicks takes half of their DNA from one parent and half from another. But not any specific half they could take almost all blue genes from one and almost all green from the other or visa a versa, or anywhere in between so they will be spalding chicks just they could be any percentage. In theory it could be possible for a chick to take only green from both parents but since their are over 20000 genes in each bird your chances of that are lower than you winning the lottery twice in a row.

Spaldings are lovely peafowl I agree with you.
A lot of people I have heard them scoff spaldings. Hybridization is a bad word to some.
But there are those who would like to have a taste of the greens but don't have a heated set up for the cold winter months. So spalding is the next best thing.
Photo is of our 75% green spalding male. He requires no heat, but he has a heated perch inside his pen. He also is split to pied and produces beautiful pied spalding chicks mated with our spalding pied hen.

That is a really good looking spalding!

For this bird is a Spalding 50% - which is why he is not afraid of the cold!
A Spalding 75% is in danger from what temperature?

I am not sure what you mean by your first sentence about 50%?

We are in southwest Indiana. We get down to 0 typically a few times in any given winter. We have gotten down to -10 since we have had this bird. Note that few if any of our peas choose to go outside in that if it is windy. We also have higher humidity here making it feel colder. They have indoor pens which has a door to go outside. In the bitter cold and if it is windy we may keep their doors to the outside closed. And usually do if weather is bad. And we protect all of them especially when wind is added to the bitter cold.  Anything over 75% they are kept in heat here. They would lose toes or worse.

Have seen blues sleep outside all winter in some cold areas. I have seen pictures of them with ice coated on feathers.

Also will add all our birds have heated perches. The perches are 2X4's with heat tape running along the board and doubled. Then there is carpet wrapped around the board and tape.  Wide enough so the birds have ample space to sit on their toes to keep them warm.