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A rule of thumb for running a breeding program is that if the genetic correlation between performance in two environments drops below 0.6, so if different genetics is required to perform well in either environment, it becomes worthwhile to split the breeding program into two: one for each environment. A correlation higher than 0.6 indicates that even though the selection of the parents may be sub-optimal, it still outweighs the costs of running two separate breeding programs. Costs involve not only the financial consequences, but the costs with respect to loss in genetic response to selection if the population is reduced in size, and with respect to maintaining genetic diversity (of the two smaller populations).
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Thus: two environments require separate breeding programs if the correlation between performance in both environments is smaller than 0.6 |
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