Which of the following can indicate poor nutrition in sheep?

A rough coat appearance in sheep is a clear indicator of poor nutrition. When sheep are not receiving adequate nutrients, their coat can become dry, brittle, and unkempt. This is often a direct result of deficiencies in key nutritional components such as protein, vitamins, and minerals that support healthy skin and wool growth.

The other options do not accurately reflect the effects of poor nutrition. Improved fleece quality would indicate adequate or even excellent nutrition, while increased aggression may be linked to various behavioral or management issues, rather than directly to nutrition. Higher lambing rates typically suggest a well-nourished and healthy flock, as adequate nutrition is critical for reproductive success in sheep. Thus, a rough coat is a notable visual cue that signals an underlying issue with the sheep's diet or overall health.