"Zion and Cichlids is all": about your comments;
There is one advantage to breeding siblings of the F2 generation. Yes, you do get more deformities but you also get more natural variation. You would only do this once and then you would breed back to a parent to stabilize your line. Or you breed to a 'wild type'. I have done this in Philippine Blue Angelfish which are very prone to deformities. Forcing the most variation allows you to select the direction you want your breed to go into, whether you want them to carry more of the traits of the father or mother in whatever combination you want. It also lets you create two or more lines with different traits with a single breeding rather than having to breed once to the mother for certain traits and then to the father to get different traits. Plus sibling to sibling crossing through several generations if you are willing to do that, can actually eliminate negative traits by selecting against them. Yes, you will get less and less viable young each generation for several generations but eventually the birthrate will begin to increase and the bad genes will have been eliminated. I have done this with hamsters for 12 generations and proven that it works. I was able to eliminate the gene for early blindness in solid black hamsters using this method.
There is one advantage to breeding siblings of the F2 generation. Yes, you do get more deformities but you also get more natural variation. You would only do this once and then you would breed back to a parent to stabilize your line. Or you breed to a 'wild type'. I have done this in Philippine Blue Angelfish which are very prone to deformities. Forcing the most variation allows you to select the direction you want your breed to go into, whether you want them to carry more of the traits of the father or mother in whatever combination you want. It also lets you create two or more lines with different traits with a single breeding rather than having to breed once to the mother for certain traits and then to the father to get different traits. Plus sibling to sibling crossing through several generations if you are willing to do that, can actually eliminate negative traits by selecting against them. Yes, you will get less and less viable young each generation for several generations but eventually the birthrate will begin to increase and the bad genes will have been eliminated. I have done this with hamsters for 12 generations and proven that it works. I was able to eliminate the gene for early blindness in solid black hamsters using this method.
