blue chickens
ok, so let me preface this with, i'm no chicken expert nor biologist, this is just something i find fascinating and i'm still a biology nerd just not employed for it lol
ok so first of all, lets lay out some facts, shane who for a majority of his time in stardew valley has been depressed and highly alcohol dependant, while working a dead end job in a soul crushing company, managed to breed chickens with not only an unusual colour but unusual physical traits, seen in functionally no other hens. that is both objectively impressive and kinda insane, but when broken down its much more impressive
firstly, creating a new breed of anything takes years and a lot of patience, on average it takes 5-7 generations to have chickens breed true (reproduce creating offspring with the same traits as them) without setbacks and on average one generation would take 6-7 months, which would mean roughly 4 years of work
on top of the time it would take, shane would have to have a very good grasp on genetics, to realize what combinations would produce whatever outcome he wants, and while he likely discovered a mutation in the colour pigment that he took advantage of, he'd still have to meticulously plan pairings and keep track of genetics and generations, trying to avoid major inbreeding while keeping the blue gene dominant in the gene pool.
but there's one thing off, true blue pigment is extremely rare in animals, with only one known species producing it, Obrina Olivewing butterfly. so how the hell could the chickens be blue?
its quite simple, Rayleigh scattering
(definition)
-Rayleigh scattering refers to the scattering of light off of the molecules of the air, and can be extended to scattering from particles up to about a tenth of the wavelength of the light. It is Rayleigh scattering off the molecules of the air which gives us the blue sky
its rayleigh scattering that also causes blue jays to be blue, seeing as the predominant pigment in their feathers is melanin making them truly brown/black in colour. ironically real world blue chickens aren't really blue, the blue genes are more of a dilution gene for black pigment
now i'm not knowledgeable enough to tell you how to make a blue chicken but my hypothesis would be a mutation/modification in feathers(possibly naturally iridescent feathers) that caused more blue to reflect, this mutation being bred through the lines, being crossed bac to produce more blue, till the chickens became solid blue.
on top of the strange color, these hens have also developed more rooster like tails, this being much simpler to explain, likely being a mutation causing increased feather growth akin to a rooster, within hens
this shows how much work and dedication shane put into his hens, and is one of the reasons he's my favourite characters, this man, who likely (to me atleast) has no science background, managed to create chickens defying what was believed to be the barrier of poultry colouration
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