Gender Bias in Lutino x Pallid IRN Pairing

I have a pair of Indian Ringneck Parrots.  The male is lutino and the hen is pallid. The genetics of this pairing dictate that the male chicks will be pallidino and females will be lutino. It is therefore possible to identify the sex of the chicks in the box soon after hatching. The pallidino males have dark, blood red eyes, whereas the lutino hens eyes are a lighter red. As the birds start to grow pin feathers, the difference in the sexes becomes even more obvious. The lutinos show pure yellow pins and the pallidinos have a greenish tinge on their feathers. The photo shows 4 lutino female chicks and a pallidino male from the latest clutch.

This pair has produced 18 chicks in 4 clutches during the last 2 years. The expected male to female ratio is 50:50. However, this pair has produced only 5 males and 13 females. The last two clutches have been 5 chicks each, with only 1 male and 4 females. The observation is based on the result of several clutches and seems to be statistically significant. I have no logical explanation for this observation. Is it just coincidence or is there something else at work that is beyond my understanding?


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