What is a common sign of nutritional deficiencies in livestock?

A common sign of nutritional deficiencies in livestock is poor coat condition. This can manifest as dullness, brittleness, or loss of hair. The coat's health is often a direct reflection of the animal's nutritional status. Nutritional deficiencies can lead to inadequate levels of essential vitamins and minerals, which play crucial roles in maintaining skin and coat health. For example, a lack of specific nutrients like protein, fatty acids, copper, or zinc may result in an unhealthy appearance of the coat.

The other options do not indicate nutritional deficiencies. Increased milk production is generally a sign of good nutrition and proper management practices. High feed conversion rates are also indicative of an efficient diet that meets the nutritional needs of the livestock. Similarly, larger body size usually suggests adequate nutrition and growth, rather than deficiency. Thus, recognizing poor coat condition as a sign allows livestock producers to take necessary actions to improve the animals' diet and overall health.