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If breeding for show as Monty said the breeder must adhere to the Standard of Perfection as for body type and color. But if you are breeding for fun then all rules are out the window. Any birds, no matter how butt ugly, that display the naked neck will also carry the traits of the NN breed such as disease resistance and heat and cold tolerance. In extreme conditions, either heat or cold, the NNs will out perform the best broilers in feed conversion and the best layers in eggs layed and feed conversion. But in mild climates they don't do as well as the commercial breeds.
Now when breeding NNs about six or so generations out of the parent stock you will start to see changes. They will get to be what is called a crow head and the dead in shell rate on hatching chicks will go through the roof. When this happens then it is time to do an outcross either with another NN or another breed altogether. They are one of the few breeds that won't breed true for a long time.
If breeding for show as Monty said the breeder must adhere to the Standard of Perfection as for body type and color. But if you are breeding for fun then all rules are out the window. Any birds, no matter how butt ugly, that display the naked neck will also carry the traits of the NN breed such as disease resistance and heat and cold tolerance. In extreme conditions, either heat or cold, the NNs will out perform the best broilers in feed conversion and the best layers in eggs layed and feed conversion. But in mild climates they don't do as well as the commercial breeds.
Now when breeding NNs about six or so generations out of the parent stock you will start to see changes. They will get to be what is called a crow head and the dead in shell rate on hatching chicks will go through the roof. When this happens then it is time to do an outcross either with another NN or another breed altogether. They are one of the few breeds that won't breed true for a long time.