Yes.. beet pulp is fantastic for horses because of it's high fiber, and is very easily digested. It's not high in fat by itself, but it does help horses gain weight in a safe way without adding a ton of extra supplements, oils, etc. Gotta love hind gut fermenters! I sometimes give soaked alfalfa pellets mixed with some of their scratch and a little of the horse's soaked beet pulp mixed in as a warm winter treat, and they loved it. But remember, if you want to give this to your chickens, SOAK first! It expands to about 3x the size (warm water will help it soak quicker). The sugars are not high because most of it is removed during the process of extracting the sugars from the sugar beets in order to make table sugar. What's left over is the beet pulp

Some companies add molasses to their beet pulp to make it more palatable for horses, so if you decide to give your chickens some, make sure it's the no-molasses pulp. But if I had a choice between the alfalfa pellets vs the beet pulp, I'd give the alfalfa pellets.
Here's some great info on beet pulp:
http://shady-acres.com/susan/beetpulp.shtml
Many people prefer to give horses soaked alfalfa cubes vs the pellets because the cubes offer the fiber value that the pellets don't. Pellets are used mainly because they soak down easier, and to add extra calories. After trying 3 different types of alfalfa cubes and having them not soak down well enough I gave up on them,and I changed to beet pulp as a extra calorie booster in the winter time for the horses. Everyone looks fantastic. But the chickens seemed to love the soaked pellets. Plus alfalfa has calcium.
I was recently able to find a local mill that is now making my own custom blend for the chickens: alfalfa hay, corn, soybean meal, and wheat, works out to about 16-17% protein. (My scratch consists of oats, BOSS, and a few other goodies soaked in a water/AVC). This new feed mix is saving me approximately $4.50 per 50 pound bag vs what I was purchasing before, and the birds love it.