quote from XBAR
Linebreeding to an individual is an entirely different, and even better, approach to stabilizing the genetics than fixing breed percentages. Incorporating both of these approaches would create an even more homogeneous product than either does independently. What I have contended throws type off is continuing to breed random percentages to each other with no intention of ever establishing set 'breed' percentage or standard. Breeding 1/2 bloods to 3/4 bloods to 5/8ths to 7/16ths back to 1/2 bloods like as seen with the simangus deal creates a hodgepodge, not a stabilized 'breed.'
If 5/8 3/8 is the composition you feel best suits your environment, then the best approach would be to continue to breed your 1/2 blood bulls to 3/4 blood cows. All of the resulting offspring will be 5/8, 3/8ths. To fix type, these first generation 5/8ths 3/8ths offspring need to be bred to other first generation 5/8th 3/8 offspring. Then, the resulting second generation 5/8ths 3/8ths bred to other second generation 5/8ths 3/8ths. Following this protocol for several generations is the only way to stabilize / fix this breed composition. This is the protocol used by those who established the Brangus and Gert breeds and this stabilization process is what has been directly responsible for the tremendous amount of prepotency noted in these lines.
(clapping)