@Sandy_01
Welcome to the surprises of the world of LFW Cornish. Lol.
Many LFW breeders have used different varieties and even different breeds to build up pump up the framework of the LFWs. This 'surprise' can be supressed in a heterozygous recessive state for many, Many, MANY generation andc and then out of the blue it will show up leaving you scratching your head in bewilderment. Here is a pic of one of my surprises. Most likely from a WLR Cornish. I hatched 400 cornish this year and had this one bizarre fella show up. I regret culling it. Out of curiosity if i ever get another one i will let it grow out.
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When it comes to white there is the recessive white, dominate white and the expression of the silver gene. I don't know how to tell which is which by looking at them. What i know is that when the silver gene is present it is expressed as black ticking here and there in the feathering. When a LFW has the silver gene they are 'stay white' cornish. They will not pull brass in direct sunlight. Cornish pull brass because they posses the gold gene. If thats the case they will pull brass in shade, in complete darkness and during the months of artic darkness. The silver gene is very desirable.
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If you look very closely at his back and right wing youll see traces of the black ticking.
Chick down may or may not be an indicator of feather color characteristics. I am studying this but have only ome year of data. They come out as silver white, yellow, wild and mixtures of any of those.
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Hens can hold viable sperm for as long as a month. They can also eject the sperm if after being covered by a rooster they comsider him inferior. Usually a week is normal.
Send me a pm with the breeder name. We all pretty much know each other.