- Breeding is about predicting the future.
- Predicting genetic gain is about predicting future performance, but also about evaluating breeding decisions beforehand.
- Genetic gain is determined by 3 main factors: phenotypic variance, accuracy of selection, and selected proportion.
- The generation interval allows to express genetic gain per year instead of per generation.
- Optimising genetic gain will require a balance between increase in accuracy and decrease of the generation interval.
- Selection paths allow for difference in selected proportion and accuracy of selection in males and females.
- Decisions on the intensity of selection depend on the consideration of genetic gain versus rate of inbreeding.
- Indirect selection using indicator traits can be a very good solution when traits are difficult to measure or expensive to record.
- Predicting genetic response to selection assuming a selected proportion and an accuracy of selection is very useful, but be aware of the (lack of) accuracy of your assumptions!
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