I have four Barb/Kat lambs that are 3 mo. old. A few days ago I noticed they had the throat-latch swelling that is possibly bottle jaw/Barber pole worms. They hadn't been wormed yet, so I drenched them with Ivomec. I have two year old wethers that had the swelling about 6 weeks ago, and it went away after worming. It has always seemed to effect spring lambs in the past, and before I knew what it was, the sheep seemed to deal with it without treatment. I guess that's the Barb/Kat natural resistance at work? I've never had losses to this. I read that it can take up to 72 hours for the worms to be expelled. Question: for those of you who have had this parasite in their sheep, did you see adult worms in the poop after worming? Was it easy to see them? In my research I came across articles about the invasive plant Sericea lespedeza, a legume, being useful for decreasing parasite loads when used as feed for sheep and goats. It seems it is produced primarily in the south. I'm in California, never heard of it or seen anything like it in feed stores, baled or bagged. I'm wondering if any of you have used it, have access to it, etc. Apparently it is most effective in pelleted form.