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For animals that are selected on the performance of their first progeny the ‘counting’ only starts from the second batch of offspring onwards. This is presented in the lower part of figure 4. Otherwise the principle is exactly the same as with selection based on own performance or sibs. It is clear that the generation interval will become longer if selection is based on progeny testing.

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If we briefly go back to the example with the jumping rabbits: The breeder was happy when selection was based on performance of 12 offspring. However, he may want to look into the matter in more detail because it will depend on the litter size whether this number can be achieved with a single batch of offspring, or whether multiple batches are required. Multiple batches mean more time and the generation interval in rabbits is low. In such situations it may be a consideration to accept a slightly lower accuracy of selection, but manage more generations of selection in the same time frame. It may result in more genetic gain per time unit in the longer run.

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