I have noticed one of our goats Bo-Bo has gray streaks in fur. He has black fur but now turned rusty. Is this a sign of copper and zinc deficiency? I have copper bolus but I haven’t given him for a while because it is very hard to give him. He has a twin brother Luke. He seems doing okay. What are those gray streaks? I also have noticed Bo-Bo's back hair has been standing up. Thank you for reading this. Aloha form Hawaii.