brother over half sister an so on
brother over half sister is in-breeding, line breeding is to form a family /strain using one common ancestor
normally an outstanding animal in it's field ... race horse, dog, pigeon or budgie ... whatever, can remember
reading a great book on the subject... primarily regarding racing pigeons but examples used regard other
animals and (though frowned upon)human beings .... (IE) the greats of GREECE .. Aristotle etc. I vaguely
remember his pedigree plan ... line breed to a stud sire as follows (the book is on loan at moment to a mate