I have 15 Reg. Blk. Angus cows. I live in midwest MN. I was just wondering what are the nutrition requirements for these cows. They won't be calving until May. I usually feed hay, but what else would be a cost-effective feedstuff. I have access to dried/wet beet pulp, corn distillers, corn screenings, ect. Aproximate amounts would be helpful. Also, what minerals should I have available to them? Thank you so much for any information