Hens and Roos
Herd Master
LS my goats love beet pulp. I've used senior feed with it in the feed for years for my horses and it sure helps keep the oldsters in decent weight. When a horse gets to late 20s & mid 30s their jaw teeth are basically gone and chewing hay is out. So this provides a "complete" feed and some of them never get hay. BP is a high calorie feed.
Goats are huge forage eaters but beet pulp will help with that satiety. They still need hay, for the long fiber Their systems are different from a horse. In winter my goats & horses like my servings of wet BP, using warm water. Even in coldest, they scoff it up before any can freeze! This also keeps moisture in their gut. Sometimes they drink less if water is cold & with dry hay, no green grass, that's a slow down factor in the gut AND a lot of dry matter can dehydrate them if not consuming water.
If your girls are thin, I'd sure get some flaked BP and add it to their grains. It's not cheap but works. Goes further per bag than you may think, especially since you feed individually. Gives them some extra calories when milking, too.
We feed a mix of beet pulp and alfalfa pellets to our goats as well as hay and it helps keep everyone at a good weight, we do have to feed our Lamancha doe separately from the rest as she needs a little more to maintain a nice weight.