What is the expected heritability for staple length in sheep?

What is the expected heritability for staple length in sheep?

• A. Moderate
• B. High
• C. Low
• D. Very high

Answer: (B)

The expected heritability for staple length in sheep is classified as high because heritability estimates generally reflect the proportion of phenotypic variance in a trait that can be attributed to genetic variance. In sheep, staple length is a trait that has been subject to selective breeding, meaning that it has been enhanced over generations through breeding practices.

Traits with high heritability are often more responsive to selection since a significant portion of the trait variation is influenced by genetics rather than environmental factors. This provides breeders with greater confidence that selecting breeding stock based on staple length will yield predictable improvements in that characteristic over subsequent generations.

In the context of sheep, where staple length is a critical factor in wool quality and market value, the focus on breeding for this trait has led to a stronger genetic component. Thus, when breeders assess the potential for improving staple length through selective breeding, a high heritability estimate indicates a favorable genetic basis for this trait.