Which of the following is not typically a moderately heritable trait?

• A. Fleece weight
• B. Body weight
• C. Reproduction
• D. Milk production

Answer: (C)

Heritability tells how much of the observed differences among animals for a trait come from genetic differences versus the environment. Traits like milk production, fleece weight, and body weight tend to have a meaningful genetic component, so their heritability is moderate. That means selecting animals with superior performance for these traits can lead to noticeable genetic gains over generations.

Reproduction behaves differently. Fertility and related reproductive traits are strongly shaped by management, nutrition, health, and environmental conditions. The genetic contribution to variation is relatively small, so heritability is typically low rather than moderate. Because of this, improving reproduction through direct selection is slower and less efficient, unless you also optimize the environment and use indirect selection via correlated production traits.

So the trait that is not typically moderately heritable is reproduction.