Lice are common parasites in sheep. They are host-dependent parasites whose population can grow rapidly, affecting productivity. For instance, lice can affect the quantity and quality of wool production. In addition, sheep tend to spend less time grazing when infested with lice, further reducing productivity. Therefore, it's critical to identify the signs of lice infestation early enough for treatment purposes if you rear sheep. The lice infestation indicators to watch out for include wool or hair loss, rubbing, inflamed skin, wounds, intense itching, weight loss and licking.