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Selection currently is art mingled with a bit of science.
Data collection is as expensive on the ranch as it is in the lab. Some types of data are very difficult to obtain, i.e., tenderness. Marriage of current evaluation and marker technologies can allow us to switch to selection with science mixed with a bit of art. A single gene test has been utilized by Limousin breeders to move towards elimination of a simple recessive disorder. How the size of an effect, proportion of variation is expressed.