Soybean meal. We used cottonseed hull pellets instead of the loose, it was a lot cheaper and easier for the mill to mix. We fed it all year this year, and had a great year this year. It is good stuff, but you got to watch it because it will make heifers fat quick! We just added more rumafill to get the fill they needed once they reached their point we wanted...
It was also cheaper than our mill's show feed, so win win there...