composition of cattle feed
This is a new one for me. In Colorado, we don't deal with peanut by-products since they are grown only in the southeast part of the U.S. There is a lot of good information online. Below is information from one source:
From: Alternative Feeds for Beef Cattle, Mark L. Wahlberg, Extension Animal Scientist, Virgina Tech., Virginia Cooperative Extension Publication 400-230. http://pubs.ext.vt.edu/400/400-230/400-230_pdf.pdf
Limitations: Peanut skins are high in tannin (18 percent) that will negatively impact protein digestibility and may affect palatability, and they are high in fat (22 percent), which contributes to their energy content but limits the levels that can be fed. Research indicates that peanut skins may be used at up to 20 percent of the total diet of cattle, but protein levels may have to be increased to compensate for the protein binding by the tannin.
I hope this answers your question. It looks like peanut by-products have some positive and negative aspects.