I just noticed a worm in one of my chickens' poop. It didn't look like the white roundworms I've seen in the past, it was deeper in the poop, seemed shorter, thicker & more brown in color. This is the first one I've noticed, my young son was sitting on the ground when the hen passed & pooped and he first noticed something wriggling in it. I have both Wazine and Ivomec pour-on, which should I use? Should I use both? If so, which one first, and how long before using the other? Thank you for your imput.