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red stars and black stars are both sex link production egg layers, pullets are young females and strait run is what the hatcheries call a shipment of unsexed chicks.
Production wyandottes usually give around 180 a year. The sex links are bred to be efficient layers. Hybrid crossings are industry secrets but reds are usually a Rhode Island Red x white Leghorn and the blacks are maybe australorp x leghorn.
My understanding is the black sexlinks are rhode island red on barred rocks ; and red sl are rir on white rir. No leghorn as far as I have researched the sexlinks. Feathersite has a great deal of detail on this.
Sex links are easier to pick by color, but even then sometimes mother nature goofs ( I have sucha goof) and humans can make mistakes on vent sexing but no such mistakes were made on my pullet order from MM this year.
Check for wing feather development; the girls grow wing feathers faster than the boys of the same breed usually. GL