I have a couple of my chickens doing the silent yawn and my rooster is shaking his head. Im wondering if this might be Gapeworm. Im going to get some foodgrade DE and swine wormer w 1.8% fenbendazole. Ive read some old posts and some suggest safeguard and panacur. Any suggestions? Im thinking if it isnt gapeworm then these should cure any pests. Any suggestions?