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I would say chemicals or a strange mutation not breeding perse.
Inbreeding father to daughter or brother to sister is fine with animals. It is used to set traits the breeder wants. After that line breeding is used which is great grand parents to great grand daughter or son. Then at some point one does a line outcross which is using a chicken usually a rooster from someone elses breeding that does not have any of your brids or line in it.
I would say chemicals or a strange mutation not breeding perse.
Inbreeding father to daughter or brother to sister is fine with animals. It is used to set traits the breeder wants. After that line breeding is used which is great grand parents to great grand daughter or son. Then at some point one does a line outcross which is using a chicken usually a rooster from someone elses breeding that does not have any of your brids or line in it.