I supplement fresh forage and fresh hay (or dried hay in the winter) with Southern States pellets. Your post made me go grab the ingredients list. It is very non-specific with the bulk plant matters; Processed grain by-products, Forage products, Plant Protein products. It has a nice list of vitamin supplements. It has a nice list of minerals. It has quite a nice list of pro-biotics. It also has molasses.
What is it about molasses that you don't like?
From the International Journal of Science, Environment and Technology:
Microbes in the rumen break down the sugars in molasses rapidly,
which extensively causes a rapid release of energy that makes molasses very useful for
balancing other feeds in the dairy diet all year round. Feeding molasses to farm animals will
improve digestion of pastures/hay; increase milk production, help maintain body condition
and appetite and result in less feed waste.
The paper indicates molasses as a pre-biotic. Rather than working in the rumen of bovines it works in the cecum of our monogastrics. It serves the same function, the prolifieration of the probiotics. But, I am probably missing something since all I can find about molasses in feed stock is positive.