CHOCOLATE DELAWARE ORPINGTON
One for the future!
Moving forward with the Delaware colour this is my first Chocolate Delaware hen
HISTORY OF THE DELAWARE ORPINGTON
This colour in another creation of Bob Follows and Bob was very kind to allow me to take his only pair on his retirement from breeding poultry. The correct name for the colour is Cuckoo Columbian and there has been a few debates over naming this colour in Orpingtons Delaware. But in my opinion if anybody deserves to name an Orpington colour then this privilege must go to Bob Follows as his dedication to the creation and promotion of new colours in the UK is unrivalled.
The original cockerel pictured below was a substantial size, width and depth and had the kindest temperament.
THE BARRING IN THE DELAWARE IS A SEX LINKED DOMINANT GENE
In poultry the sex of any chick is determined by the hen not the cockerel.
The cockerel carries two Z chromosomes so he is ZZ.
The hen carries one Z chromosome and one W chromosome so she is ZW.
The cockerel must pass one of his Z chromosomes onto his offspring so any sex linked genes that are on that chromosome such as Silver, Bantam, Barring and Chocolate will be inherited.
The hen can pass either her Z or her W chromosome on to her offspring. If she passes her Z chromosome on her chicks will be male and they will inherit all the sex linked genes that are on that Z chromosome but if she passes her W chromosome on, her chicks will be female and they will inherit none of the sex linked genes she is carrying.
Genes that are sex linked can only be carried on the male chromosome.
Because the barring gene that creates the cuckoo effect on the black parts of this colour is sex linked, the cockerels carry a double dose and therefore show distinct barring but the hens can only carry a single dose and loose the barring throughout the tail.