What is the heritability of birthweight in sheep?

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

Answer: (B)

The heritability of birthweight in sheep is generally considered to be moderate. This indicates that a significant portion of the variation in birthweight among sheep can be attributed to genetic differences, but environmental factors also play a role.

In the context of breeding and genetics, understanding heritability is crucial because it helps breeders estimate how effective selection for a trait will be in the generation of offspring. With moderate heritability, it suggests that while genetics is important in determining birthweight, environmental influences such as nutrition and management practices also substantially affect this trait. This information can guide sheep breeders in making informed decisions regarding selection strategies to improve birthweight while considering environmental impacts.

High heritability would suggest that genetics play a dominant role with little influence from the environment, which is not the case for birthweight in sheep. Similarly, low or very high heritability values do not accurately reflect the balance of genetic and environmental factors seen in this trait.