Are you folks referring to a NN Roo over an Australorp hen? What would the opposite yield? Just curious. --BB
If you simply want to mix the two breeds it doesn't really matter. However, if you're looking for particular traits, it could make a big difference. I track a lot of data on my birds, including egg laying habits, growth rates, sizes at various ages, etc. When I created that NN/Aussie cross, I used my best laying Australorp hen and my hardiest NN rooster that came from one of my best laying NN hens that also had the body shop I've come to recognize as being best for egg production. Knowing the lineage and habits of the birds I used was very helpful.
For my meat production line of NNs, I'll select based upon length and straightness of keel, broadness of back, spacing around the pubic bones, depth of chest, growth rates, rate of musculature, feed efficiency.....of parents, grandparents, etc.
I've experimented with crossed NN hens with fully feathered (FF) breeds and vice versa and noted which tends to give me the best results. There ARE differences, which surprised me. From my observations, maternal traits seem to pass on more easily than paternal ones in many cases, but I'm still new enough to genetics tracking and planning to still prove myself wrong on that in the future.
