This is how I was taught.
Inbreeding is brother to sister, it will intensify good and bad genes quickly. In general livestock terms one inbreeding from completely unrelated stock rarely produces small size and bad genes showing up. Second inbreeding of those offspring is higher risk.
Linebreeding is mother to son, or father to daughter. Most people line breed (I think, I hope). It is slower to enhance a look or color but much safer. Rarely produces weak, small offspring.
Outbreeding any two unrelated animals
Amanda

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