Depends on if the Black Orp is carrying the gene for mottling. It's recessive, so to get mottled chicks, both parents need at least one copy of the gene to pass on. If the rooster is split, than 50% will be mottled and 50% will be 'split'. If he isn't carrying the gene at all, than none of the chicks will express the mottling. All chicks will be carrying a copy from their mothers, though.
Genes rarely inherit in nice and even percentages. The fact that you got any mottled proves that your rooster is carrying a gene for the mottling. The chocolate ones are the real surprise. The rooster must also be carrying chocolate. He had to have inherited it from his Black Mottled father.
All but one were females. One chocolate mottled was male.
Than one of the Jubilee hens has to be chocolate.
Nope, they are all the good mahogany red. I suppose there could be chocolate behind them somewhere. Two of them were crossed with black mottled two generations back, so they'd be 25% black mottled.
Check them over really well. To get a chocolate male, one of the hens must also have chocolate. It's a modifying gene for black patterning only. And hens can't carry it. Hens always express it. Jubilee are red with black and white flecks. One must have chocolate flecks instead of black.
