Originally Posted by ChickaLong
Thank You, I see the crest is required. Any statics on the % that hatch being non crested?
That is such a good question !! And one of the reasons that breeding non-crested is detrimental to the breed. You can see from the SOP that lack of crest is a disqualification in the show world.
Two non-crested birds will produce 100% non-crested offspring. One non-crested bird paired with a CL that has two Cresting genes (Cr/Cr) and is homozygous for cresting would produce ALL offspring with 1 cresting gene and one non-cresting gene -- heterozygous for cresting.
The cresting gene (Cr) is incompletely dominant. That means that if only one Cr gene is present the other gene on that place holder non-crested (cr) will have some influence on the crest. -- So a CL with an extremely teeny crest would still be considered a CL -- but could pass to progeny the one non-cresting gene it carries. IF you pair two that are split (heterozygous) for cresting - (gene symbol Cr/cr) -- according to Punnett's square 25% of their offspring will be non-crested. Two heterozygous for cresting birds would have 50% of their offspring with only one cresting gene -- and thus non-crestedness could be carried into the future by 75% of the chicks from a pair that is heterozygous for the correct genetic recipe. Only 25% of the chicks from such a pairing would have both of the genes for cresting - be homozygous Cr/Cr.
Although a very nice chicken and good egg layer -- the above chicken is suspected of having only one cresting gene... she is also very cinnamon - burnt-orange colored on her back and top wing feathers, so she is probably lacking the ig - gold dilution genetic pair.
This pullett - has a normal -- but not too IMO bouffant cest for a Cream Legbar....
Genetic experts - please weigh in if there is a better way to describe it. Thanks!
Edited by ChicKat - 10/13/15 at 1:25pm