Hey Nitro, Those are good questions and you will get the best answers here specially from Ken and Dipsy (Lisa) but I want to make some comments. The eggs size is only determined by the female. Second do you know that NN came in bantam size ? Of course they are not as tiny as the Serama. As far as the cross, the offspring will not be of the same size, all will be different until way down the line say F17. Any breeding with different size breeds will vary, some bigger, some smaller and some medium. I think that you are planning a Serama rooster over NN hens and I think that is the better way. Small guy on top.
Most of the standard size NN females that I have or had are 1/3 less the size of the rooster. I have just started to raise bantam NN. Five hatched out and were all the same size except the one who needed the shell peeled off. As they have grown, they are not all the same size. Next spring I will be looking for chicks since I do NOT seem to have good incubation skills.
I hope that you are enjoying your new babies.
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Most of the standard size NN females that I have or had are 1/3 less the size of the rooster. I have just started to raise bantam NN. Five hatched out and were all the same size except the one who needed the shell peeled off. As they have grown, they are not all the same size. Next spring I will be looking for chicks since I do NOT seem to have good incubation skills.
I hope that you are enjoying your new babies.

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