I have 3 new chicks that constantly shake their head and gape. They are 8 weeks old Silkies, otherwise in good health; eating and drinking fine. No other symptoms. I think it might be gapeworm? Will Wazine17 help get rid of them? I know ivermectin will work, I just have NO idea as to the dosage and even how to use this on chickens. Any advise please? Thanks in advance for any replies.