What is a key indicator of a sheep being in a sick condition?

Mucus production is a key indicator of a sheep being in a sick condition because it often signifies underlying health issues, such as respiratory infections or gastrointestinal problems. When sheep exhibit increased mucus production, it can indicate that their body is responding to an infection or irritant. This physiological response is common among various illnesses and should prompt a closer assessment of the animal's overall health and behavior.

In contrast, high energy levels and eating regularly are typically signs of good health. Healthy sheep generally display vitality and maintain their appetite, and any deviations from these norms might suggest potential issues rather than serious illness.

Heavy wool shedding can occur in various situations, including seasonal changes or stress, but it is not a definitive indicator of sickness. While it may signal poor management conditions or nutritional deficiencies, it does not directly correlate to an active health issue in the same way that mucus production does. Thus, the presence of excessive mucus is a more direct and concerning sign of illness in sheep.