Dan,
I've never actually mowed it. I break it off by hand and just store it loose in the barn for hay. Don't put up much of it that way. I ordered S. Lespedeza from a forage/pasture seed supplier, don't remember name now. I do have 9 pasture/paddocks to rotate on, and that also helps parasite control. While other farmers in the area I live in were losing huge numbers of animals, primarily to parasites being out of control, I never had a problem at all. Mortality last two years was zero, even in babies. Very healthy animals, but I do an intensive program with organic feeds/minerals like coral calcium, kelp, a good mineral mix free choice, etc., and I feed garlic to my goats sometimes, at milking time so it does not flavor the milk. Any other time would, as the odor stays in the body a certain number of hours. Check around online before you order seed. A reputable feed/seed dealer will usually charge a fair price. Goats can digest lespedeza, cows not so well. Goats are amazing animals.
Melba