Would breeding a cochin and brahma together give the next generation vulture hocks?
Vulture hocks being recessive should not be visable in the first generation cross, if the Brahma side of the family was free from this defect, as it should. However every chick from this cross will be carrying a single unseen copy for vulture hocks. It's when a chick receives a copy from both parents that it is apparent. If my tired brain is functioning properly, a breeding of two of these first generation crosses, should produce 25% two copy vulture hock showing chicks, 50% one copy normal looking chicks, and 25% no copy normal chicks. But to the eye the last two groups will look the same. This is a oversimplified explanation, but you get the idea.