Test your knowledge: Correlations

Correlations refer to the relationship between traits e.g. frame size and weight. There is variation in how animals express this relationship.

True

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False

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What is a strong genetic correlation?

A correlation where when one trait increases another is also likely to increase.

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A correlation where when one trait increases another is likely to decrease.

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Any correlation where it is very likely that as one trait changes another will also change – where a lot of genes are in common between the two traits.

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A positive correlation occurs when one trait increases as another increases. Though positive, these correlations are not always favourable. Select the positive, unfavourably (antagonistically) correlated traits:

Fleece weight and fibre diameter

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Post weaning weight and lean meat yield

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An example of two negatively correlated traits are:

Post weaning weight and lean meat yield

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Lean meat yield and intramuscular fat (marbling)

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Single trait selection can have a detrimental impact on your breeding objective and flock/herd as:

Selection for one trait is likely to result in change in other traits due to correlations.

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Selection for one trait will only result in change in just that one trait.

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Understanding your genetic evaluation

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