I brought my three 4-H show wethers home on April 7th. They had been on timothy/orchard hay, and free choice 16% textured non-medicated feed.
It was still somewhat chilly and damp when I brought them home, and I do not have a "warm" shelter for them. So I added Chaffhaye to their orchard hay and free choice 16% textured feed. A little over a month after bringing them home, one of the developed a blockage die to urinary calculi, and had to have the blockage surgically repaired... The vet said it was likely due to the Chaffehaye - NOT the grain.
Based on that, I will no longer feed Chaffhaye to any wethers. Can't comment on other "sexes" of goats, as I do not have any experience with them.