Usually one will be male and the other is a female.
How do you know which egg will produce male chick and which will be the Female?
This is where Fatich Marzuki comes in.
In his book titled: Meningkat Produksi Sarang Walet Berazas Kelastarian" page 53, he displayed a chart comparing between the serinti and swiftlet eggs.
He also indicated which will be the female and which will be the male.
Have a look and maybe by now you can have a 100% sure that they are the right chick for your breeding operation. Double click on the picture to get a larger display.
Remember breed more female then male.
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